FLUORESCENCE RESPONSE CURVES IN FOUR CROSSBREED POPLARS
Light response curve in terms of fluorescence and quantum flux density (DpF) were measured for 4 typical crossbreed poplars in Ili Autonomous Prefecture in Xinjiang: (P. deltaids cv-64 (P64), P.balsamifera L. (Da), P. eurarnericana (1-262) and P. euramerieana cv (1-467)). F′m of these poplars directly impacted on photochemical efficiency of photosystem Ⅱ (PS Ⅱ ) and actual photochemical efficiency of PSⅠ(ΦpsⅡ). F′o and Fs in different crossbreeds had different influence on PS Ⅱ and ΦpsⅡ, playing an indirect regulative role, with F′o participating to greater extent in ΦｐsⅡ. Pn, as an indicator for plant biological behavior, lagged behind photochemical behavior. Total light energy conversion in plants was dependent on chlorophyll capture of light quantum. Actual electron conduct velocity (vＥTR) in leaves driving PS Ⅱ reflected actual flow quantum. When vETR reached a maximum, PE would also reach a maximum, leading to maximum solar energy conversion. It is concluded therefore that vＥTR and DpF are more desirable than apparent quantum efficiency for calculations of solar energy utilization and solar energy conversion capacity in plants.
the light response curveelectron conduct velocityenergy conversionphotochemical quenchingnon-photochemical quenching
国家科技期刊平台
NSTL
万方数据
维普
