start-ver=1.4 cd-journal=joma no-vol=71 cd-vols= no-issue=3 article-no= start-page=1067 end-page=1083 dt-received= dt-revised= dt-accepted= dt-pub-year=2023 dt-pub=20230723 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Analysis of genetic diversity and population structure in Cambodian melon landraces using molecular markers en-subtitle= kn-subtitle= en-abstract= kn-abstract=Genetic diversity of Cambodian melons was evaluated by the analysis of 12 random amplified polymorphic DNA (RAPD) and 7 simple sequence repeat (SSR) markers using 62 accessions of melon landraces and compared with 231 accessions from other areas for genetic characterization of Cambodian melons. Among 62 accessions, 56 accessions were morphologically classified as small-seed type with seed lengths shorter than 9 mm, as in the horticultural groups Conomon and Makuwa. Gene diversity of Cambodian melons was 0.228, which was equivalent to those of the groups Conomon and Makuwa and smaller than those of Vietnamese and Central Asian landraces. A phylogenetic tree constructed from a genetic distance matrix classified 293 accessions into three major clusters. Small-seed type accessions from East and Southeast Asia formed clusters I and II, which were distantly related with cluster III consisting of large-seed type melon from other areas. All Cambodian melons belonged to cluster I (except three accessions) along with those from Thailand, Myanmar, Yunnan (China), and Vietnam (gDua thomh in the northwest), thus indicating genetic similarity in these areas. In addition, the Cambodian melons were not differentiated among geographical populations. Conomon and Makuwa were classified into cluster II, together with melon groups from the plains of Vietnam. The presence of two groups of melons in Southeast Asia was also indicated by population structure and principal coordinate analysis. These results indicated a close genetic relationship between Cambodia and the neighboring countries, thus suggesting that Cambodian melons are not directly related to the establishment of Conomon and Makuwa. en-copyright= kn-copyright= en-aut-name=NazninPervin Mst en-aut-sei=Naznin en-aut-mei=Pervin Mst kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=ImohOdirichi Nnennaya en-aut-sei=Imoh en-aut-mei=Odirichi Nnennaya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TanakaKatsunori en-aut-sei=Tanaka en-aut-mei=Katsunori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=SreynechOuch en-aut-sei=Sreynech en-aut-mei=Ouch kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=ShigitaGentaro en-aut-sei=Shigita en-aut-mei=Gentaro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=SopheaYon en-aut-sei=Sophea en-aut-mei=Yon kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=SophanySakhan en-aut-sei=Sophany en-aut-mei=Sakhan kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=MakaraOuk en-aut-sei=Makara en-aut-mei=Ouk kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=TomookaNorihiko en-aut-sei=Tomooka en-aut-mei=Norihiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=MondenYuki en-aut-sei=Monden en-aut-mei=Yuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= en-aut-name=NishidaHidetaka en-aut-sei=Nishida en-aut-mei=Hidetaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=11 ORCID= en-aut-name=KatoKenji en-aut-sei=Kato en-aut-mei=Kenji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=12 ORCID= affil-num=1 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=3 en-affil=Faculty of Agriculture and Life Science, Hirosaki University kn-affil= affil-num=4 en-affil=Cambodian Agricultural Research and Development Institute kn-affil= affil-num=5 en-affil=Department of Life Science Systems, Technical University of Munich kn-affil= affil-num=6 en-affil=Cambodian Agricultural Research and Development Institute kn-affil= affil-num=7 en-affil=Cambodian Agricultural Research and Development Institute kn-affil= affil-num=8 en-affil=Plant Breeder, Retired Director of the Cambodian Agricultural Research and Development Institute kn-affil= affil-num=9 en-affil=Research Center of Genetic Resources, National Agriculture and Food Research Organization (NARO) kn-affil= affil-num=10 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=11 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=12 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= en-keyword=Cambodia kn-keyword=Cambodia en-keyword=Conomon kn-keyword=Conomon en-keyword=Cucumis melo kn-keyword=Cucumis melo en-keyword=Genetic diversity kn-keyword=Genetic diversity en-keyword=Landraces kn-keyword=Landraces en-keyword=RAPD kn-keyword=RAPD en-keyword=SSR kn-keyword=SSR END start-ver=1.4 cd-journal=joma no-vol=73 cd-vols= no-issue=3 article-no= start-page=269 end-page=277 dt-received= dt-revised= dt-accepted= dt-pub-year=2023 dt-pub=2023 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Elucidation of genetic variation and population structure of melon genetic resources in the NARO Genebank, and construction of the World Melon Core Collection en-subtitle= kn-subtitle= en-abstract= kn-abstract=Numerous genetic resources of major crops have been introduced from around the world and deposited in Japanese National Agriculture and Food Research Organization (NARO) Genebank. Understanding their genetic variation and selecting a representative subset (gcore collectionh) are essential for optimal management and efficient use of genetic resources. In this study, we conducted genotyping-by-sequencing (GBS) to characterize the genetic relationships and population structure in 755 accessions of melon genetic resources. The GBS identified 39,324 single-nucleotide polymorphisms (SNPs) that are distributed throughout the melon genome with high density (one SNP/10.6 kb). The phylogenetic relationships and population structure inferred using this SNP dataset are highly associated with the cytoplasm type and geographical origin. Our results strongly support the recent hypothesis that cultivated melon was established in Africa and India through multiple independent domestication events. Finally, we constructed a World Melon Core Collection that covers at least 82% of the genetic diversity and has a wide range of geographical origins and fruit morphology. The genome-wide SNP dataset, phylogenetic relationships, population structure, and the core collection provided in this study should largely contribute to genetic research, breeding, and genetic resource preservation in melon. en-copyright= kn-copyright= en-aut-name=ShigitaGentaro en-aut-sei=Shigita en-aut-mei=Gentaro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=DungTran Phuong en-aut-sei=Dung en-aut-mei=Tran Phuong kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=PervinMst. Naznin en-aut-sei=Pervin en-aut-mei=Mst. Naznin kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=DuongThanh-Thuy en-aut-sei=Duong en-aut-mei=Thanh-Thuy kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=ImohOdirich Nnennaya en-aut-sei=Imoh en-aut-mei=Odirich Nnennaya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=MondenYuki en-aut-sei=Monden en-aut-mei=Yuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=NishidaHidetaka en-aut-sei=Nishida en-aut-mei=Hidetaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=TanakaKatsunori en-aut-sei=Tanaka en-aut-mei=Katsunori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=SugiyamaMitsuhiro en-aut-sei=Sugiyama en-aut-mei=Mitsuhiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=KawazuYoichi en-aut-sei=Kawazu en-aut-mei=Yoichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= en-aut-name=TomookaNorihiko en-aut-sei=Tomooka en-aut-mei=Norihiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=11 ORCID= en-aut-name=KatoKenji en-aut-sei=Kato en-aut-mei=Kenji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=12 ORCID= affil-num=1 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=3 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=4 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=5 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=6 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=7 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=8 en-affil=Faculty of Agriculture and Life Science, Hirosaki University kn-affil= affil-num=9 en-affil=Institute of Vegetable and Floriculture Science, National Agriculture and Food Research Organization (NARO) kn-affil= affil-num=10 en-affil=Institute of Vegetable and Floriculture Science, National Agriculture and Food Research Organization (NARO) kn-affil= affil-num=11 en-affil=Research Center of Genetic Resources, National Agriculture and Food Research Organization (NARO) kn-affil= affil-num=12 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= en-keyword=Cucumis melo kn-keyword=Cucumis melo en-keyword=Cucurbitaceae kn-keyword=Cucurbitaceae en-keyword=genotyping-by-sequencing kn-keyword=genotyping-by-sequencing en-keyword=genetic resource kn-keyword=genetic resource en-keyword=genetic diversity kn-keyword=genetic diversity en-keyword=crop origin kn-keyword=crop origin en-keyword=core collection kn-keyword=core collection END start-ver=1.4 cd-journal=joma no-vol=73 cd-vols= no-issue=2 article-no= start-page=219 end-page=229 dt-received= dt-revised= dt-accepted= dt-pub-year=2023 dt-pub=2023 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Melon diversity on the Silk Road by molecular phylogenetic analysis in Kazakhstan melons en-subtitle= kn-subtitle= en-abstract= kn-abstract=To uncover population structure, phylogenetic relationship, and diversity in melons along the famous Silk Road, a seed size measurement and a phylogenetic analysis using five chloroplast genome markers, 17 RAPD markers and 11 SSR markers were conducted for 87 Kazakh melon accessions with reference accessions. Kazakh melon accessions had large seed with exception of two accessions of weedy melon, Group Agrestis, and consisted of three cytoplasm types, of which Ib-1/-2 and Ib-3 were dominant in Kazakhstan and nearby areas such as northwestern China, Central Asia and Russia. Molecular phylogeny showed that two unique genetic groups, STIa-2 with Ib-1/-2 cytoplasm and STIa-1 with Ib-3 cytoplasm, and one admixed group, STIAD combined with STIa and STIb, were prevalent across all Kazakh melon groups. STIAD melons that phylogenetically overlapped with STIa-1 and STIa-2 melons were frequent in the eastern Silk Road region, including Kazakhstan. Evidently, a small population contributed to melon development and variation in the eastern Silk Road. Conscious preservation of fruit traits specific to Kazakh melon groups is thought to play a role in the conservation of Kazakh melon genetic variation during melon production, where hybrid progenies were generated through open pollination. en-copyright= kn-copyright= en-aut-name=TanakaKatsunori en-aut-sei=Tanaka en-aut-mei=Katsunori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SugiyamaMitsuhiro en-aut-sei=Sugiyama en-aut-mei=Mitsuhiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=ShigitaGentaro en-aut-sei=Shigita en-aut-mei=Gentaro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=MurakamiRyoma en-aut-sei=Murakami en-aut-mei=Ryoma kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=DuongThanh-Thuy en-aut-sei=Duong en-aut-mei=Thanh-Thuy kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=AierkenYasheng en-aut-sei=Aierken en-aut-mei=Yasheng kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=ArtemyevaAnna M en-aut-sei=Artemyeva en-aut-mei=Anna M kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=MamypbelovZharas en-aut-sei=Mamypbelov en-aut-mei=Zharas kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=IshikawaRyuji en-aut-sei=Ishikawa en-aut-mei=Ryuji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=NishidaHidetaka en-aut-sei=Nishida en-aut-mei=Hidetaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= en-aut-name=KatoKenji en-aut-sei=Kato en-aut-mei=Kenji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=11 ORCID= affil-num=1 en-affil=Faculty of Agriculture and Life Science, Hirosaki University kn-affil= affil-num=2 en-affil=Institute of Vegetable and Floriculture Science, National Agriculture and Food Research Organization (NARO) kn-affil= affil-num=3 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=4 en-affil=Faculty of Agriculture and Life Science, Hirosaki University kn-affil= affil-num=5 en-affil=Faculty of Agronomy, University of Agriculture and Forestry, Hue University kn-affil= affil-num=6 en-affil=Center for Hami Melon, Xinjiang Academy of Agricultural Sciences kn-affil= affil-num=7 en-affil=All-Russian Institute of Plant Genetic Resources on the name of N.I.Vavilov (VIR) kn-affil= affil-num=8 en-affil=Kazakhstan Research Institute of Potato and Vegetable Growing LLC kn-affil= affil-num=9 en-affil=Faculty of Agriculture and Life Science, Hirosaki University kn-affil= affil-num=10 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=11 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= en-keyword=Central Asia kn-keyword=Central Asia en-keyword=Cucumis melo kn-keyword=Cucumis melo en-keyword=diversity kn-keyword=diversity en-keyword=genetic resources kn-keyword=genetic resources en-keyword=on-farm conservation kn-keyword=on-farm conservation END start-ver=1.4 cd-journal=joma no-vol=105 cd-vols= no-issue= article-no= start-page=7 end-page=15 dt-received= dt-revised= dt-accepted= dt-pub-year=2016 dt-pub=20160201 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=•ͺŽqˆβ“`Šw“IŽθ–@‚π—p‚’‚½‚ν‚ͺ‘ƒƒƒ“•iŽν‚Μ‘½—l«‚Ζ•ͺ—ή kn-title=Molecular-based analysis of genetic diversity and classification of Japanese melon breeding lines en-subtitle= kn-subtitle= en-abstract= kn-abstract=For the breeding of Japanese netted melon, various types of foreign cultivars have been utilized for improving adaptability, disease and pest resistance, fruit quality and so on. However, little is known about their genetic diversity and relationships, since most cultivars derived from crosses between various horticultural groups. To figure out the genetic structure of Japanese melon, in this study, 57 melon accessions from three horticultural groups were examined using 55 RAPD markers produced by 24 RAPD primers. Genetic diversity of the Japanese netted melon was as high as those of cultivar groups of Groups Cantalupensis and Inodorus, while it was low in Group Conomon irrespective of large variations in fruit traits. Cluster analysis and PCO analysis based on genetic distance showed that Group Conomon was distantly related to other melon accessions. Among the latter, European cantaloupe (nonnetted) and American open-field type (netted) proved to be genetically close, while England glasshouse melon (netted) including eEarlfs Favouritef is distantly related to these two groups and closely related with Group Inodorus. It was therefore suggested that England glasshouse type was established from hybrids between European cantaloupe and Group Inodorus. Japanese netted melon was most closely related with England glasshouse type, irrespective of the fact that various kinds of melon accessions have been crossed to improve adaptability, disease resistance and so on. In contrast, pure line cultivars of the Japanese netted melon bred by pure line selection from eEarl's Favouritef or by crossing eEarlfs Favouritef with eBritish Queenf were confirmed to be mostly homogenous, and it was difficult to establish RAPD markers to discriminate each cultivar. Group Conomon var. makuwa and var. conomon, which have been cultivated and utilized as different crops, proved to be genetically indistinguishable and were considered to share the same gene pool. en-copyright= kn-copyright= en-aut-name=DungTran Phuong en-aut-sei=Dung en-aut-mei=Tran Phuong kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TanakaKatsunori en-aut-sei=Tanaka en-aut-mei=Katsunori kn-aut-name=“c’†Ž“T kn-aut-sei=“c’† kn-aut-mei=Ž“T aut-affil-num=2 ORCID= en-aut-name=AkashiYukari en-aut-sei=Akashi en-aut-mei=Yukari kn-aut-name=–ΎΞ—R—˜ kn-aut-sei=–ΎΞ kn-aut-mei=—R—˜ aut-affil-num=3 ORCID= en-aut-name=ThuyDuong Thanh en-aut-sei=Thuy en-aut-mei=Duong Thanh kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=NishidaHidetaka en-aut-sei=Nishida en-aut-mei=Hidetaka kn-aut-name=Ό“c‰p—² kn-aut-sei=Ό“c kn-aut-mei=‰p—² aut-affil-num=5 ORCID= en-aut-name=KatoKenji en-aut-sei=Kato en-aut-mei=Kenji kn-aut-name=‰Α“‘Š™Ži kn-aut-sei=‰Α“‘ kn-aut-mei=Š™Ži aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=‰ͺŽR‘εŠwŠΒ‹«Ά–½‰ΘŠwŒ€‹†‰Θ affil-num=2 en-affil= kn-affil=O‘O‘εŠwl•ΆŠw•” affil-num=3 en-affil= kn-affil=‰ͺŽR‘εŠwŠΒ‹«Ά–½‰ΘŠwŒ€‹†‰Θ affil-num=4 en-affil= kn-affil=‰ͺŽR‘εŠwŠΒ‹«Ά–½‰ΘŠwŒ€‹†‰Θ affil-num=5 en-affil= kn-affil=‰ͺŽR‘εŠwŠΒ‹«Ά–½‰ΘŠwŒ€‹†‰Θ affil-num=6 en-affil= kn-affil=‰ͺŽR‘εŠwŠΒ‹«Ά–½‰ΘŠwŒ€‹†‰Θ en-keyword=breeding kn-keyword=breeding en-keyword=classification kn-keyword=classification en-keyword=genetic diversity kn-keyword=genetic diversity en-keyword=melon kn-keyword=melon en-keyword=RAPD kn-keyword=RAPD END start-ver=1.4 cd-journal=joma no-vol=94 cd-vols= no-issue=1 article-no= start-page=47 end-page=55 dt-received= dt-revised= dt-accepted= dt-pub-year=2005 dt-pub=20050201 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Effects of Heading-time Genes on Pre-flowering Developmental Phases in Rice kn-title=ƒCƒlo•δŠϊˆβ“`Žq‚ΜŠJ‰Τ‘OΆˆη‘Š‚Ι‹y‚Ϊ‚·Œψ‰Κ‚Μ‰πΝ en-subtitle= kn-subtitle= en-abstract= kn-abstract=Sixteen heading-time tester lines in rice (Oryza Sativa L.) for the six loci were subjected to transfer treatments from short (10-h) to long photoperiod(24-h) and vice versa at various times. Using an analytical model, we estimated seven parameters for the three pre-flowering developmental phases of each line: the basic vegetative phase (BVP), the subsequent photoperiod-sensitive phase (PSP), and the post photoperiod-sensitive phase until heading (PPP). The Sel locus was found to have an extrremely strong effect on PSP; Ef1, a slight effect on BVP and a considerable effect on PPP; and E1, a considerable effect on PSP, although their effects were modified by nonallelic interactions at these three loci. The effects of three other loci were almost negligible. Subsequently, two late-heading mutant lines HS169 and HS276 with an extremely long basic vegetative growth (BVG; days to heading under short photoperiod) period conferred by a recessive mutant gene ef1-h and a novel gene ef2, were subjected to photoperiodic transfer treatments. Both mutant genes were found to increase BVP and PPP markedly by themselves, whereas ef1 required nonallelic interaction with the Se1 locus. Based on the results, causal genetic pathways to flowering in rice and the significance of ef1-h and ef2 in recent rice breeding in the low latitudes were discussed. en-copyright= kn-copyright= en-aut-name=NishidaHidetaka en-aut-sei=Nishida en-aut-mei=Hidetaka kn-aut-name=Ό“c‰p—² kn-aut-sei=Ό“c kn-aut-mei=‰p—² aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=‰ͺŽR‘εŠw en-keyword=rice kn-keyword=rice en-keyword=pre-flowering kn-keyword=pre-flowering en-keyword=developmental phase kn-keyword=developmental phase en-keyword=BVP kn-keyword=BVP en-keyword=PSP kn-keyword=PSP en-keyword=PPP kn-keyword=PPP END