start-ver=1.4 cd-journal=joma no-vol=2 cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2002 dt-pub=20020402 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=High-susceptibility of photosynthesis to photoinhibition in the tropical plant Ficus microcarpa L. f. cv. Golden Leaves en-subtitle= kn-subtitle= en-abstract= kn-abstract=

Background: The tropical plant Ficus microcarpa L. f. cv. Golden Leaves (GL) is a high-light sensitive tropical fig tree in which sun-leaves are yellow and shade-leaves are green. We compared the response of photosynthetic activities to strong light between GL and its wild-type (WT, Ficus microcarpa L. f.).

Results: Field measurements of maximum photosystem II (PSII) efficiency (Fv/Fm) of intact sunleaves in GL showed that photo synthetic activity was severely photoinhibited during the daytime (Fv/Fm = 0.46) and subsequently recovered in the evening (Fv/Fm = 0.76). In contrast, WT did not show any substantial changes of Fv/Fm values throughout the day (between 0.82 and 0.78). Light dependency of the CO2 assimilation rate in detached shade-leaves of GL showed a response similar to that in WT, suggesting no substantial difference in photosynthetic performance between them.Several indicators of photoinhibition, including declines in PSII reaction center protein (D1)content, Fv/Fm value, and O2 evolution and CO2 assimilation rates, all indicated that GL is much more susceptible to photoinhibition than WT. Kinetics of PAM chlorophyll a fluorescence revealed that nonphotochemical quenching (NPQ) capacity of GL was lower than that of WT.

Conclusion: We conclude that the photosynthetic apparatus of GL is more highly susceptible to photoinhibition than that of WT.

en-copyright= kn-copyright= en-aut-name=TakahashiShunichi en-aut-sei=Takahashi en-aut-mei=Shunichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TamashiroAyumu en-aut-sei=Tamashiro en-aut-mei=Ayumu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=SakihamaYasuko en-aut-sei=Sakihama en-aut-mei=Yasuko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=YamamotoYasusi en-aut-sei=Yamamoto en-aut-mei=Yasusi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=KawamitsuYoshinobu en-aut-sei=Kawamitsu en-aut-mei=Yoshinobu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=YamasakiHideo en-aut-sei=Yamasaki en-aut-mei=Hideo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= affil-num=1 en-affil= kn-affil=Laboratory of Cell and Functional Biology, Faculty of Science, University of the Ryukyus affil-num=2 en-affil= kn-affil=Laboratory of Cell and Functional Biology, Faculty of Science, University of the Ryukyus affil-num=3 en-affil= kn-affil=Laboratory of Cell and Functional Biology, Faculty of Science, University of the Ryukyus affil-num=4 en-affil= kn-affil=Department of Biology, Faculty of Science, Okayama University affil-num=5 en-affil= kn-affil=Laboratory of Crop Science, Faculty of Agriculture, University of the Ryukyus affil-num=6 en-affil= kn-affil=Laboratory of Cell and Functional Biology, Faculty of Science, University of the Ryukyus en-keyword=Carbon dioxide kn-keyword=Carbon dioxide en-keyword=Chlorophyll kn-keyword=Chlorophyll en-keyword=Ficus kn-keyword=Ficus en-keyword=Genotype kn-keyword=Genotype en-keyword=Oxygen kn-keyword=Oxygen en-keyword=Photosynthesis kn-keyword=Photosynthesis en-keyword=Photosystem II protein complex kn-keyword=Photosystem II protein complex en-keyword=Plant leaves kn-keyword=Plant leaves END