Photosynthetic characteristics of Sinojackia huangmeiensis,a species with extremely small population
Sinojackia huangmeiensis,an endemic species with extremely small population in China,was listed as one of the national key protected wild plants.To investigate the response and acclimation of S.huangmeiensis to dif-ferent light environments,we selected plants in three habitats(gap,understory,and full sunlight habitats),and compared leaf phenotypic traits,photosynthetic characteristics and chlorophyll fluorescence parameters in different habitats.Compared to the full sunlight habitat,specific leaf area(SLA)of S.huangmeiensis was significantly high-er,while leaf thickness(LT)and dry matter content(LDMC)were significantly lower in gap and understory habi-tats.The maximum net photosynthetic rate(Pmax)and light saturation point(LSP)were the highest in the full sun-light habitat,while light compensation point(LCP)and dark respiration rate(Rd)were the lowest in the understo-ry habitat.The electron transport rate(ETR),the effective PS Ⅱ quantum yield[Y(Ⅱ)],photochemical quench-ing(qP)and non-photochemical quenching(NPQ)in gap and full sunlight habitats were higher than those in the understory habitat.Our results suggested that S.huangmeiensis can acclimate to the low light environment by reduc-ing LCP,Rd and NPQ,and acclimate to the high light environment by increasing LT,LDMC,LSP and NPQ.Additionally,S.huangmeiensis showed strong acclimation to different habitats,which was of great importance for population regeneration and maintenance,and thus provided new insights for artificial introduction.
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