2010•Xibei Linxueyuan xuebaoRequires access
Effects of Drought Stress on Chlorophyll Fluorescence of Four Hybrid Tulip Clones
Sun Zhi-yong, JI Kong-shu
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Abstract
Drought-resistant Liriodendron chinense×L.tulipifera clones of NE25,NE78 and Drought-sensitive L.chinense×L.tulipifera clones of NE04,NE23 were selected for studying the changes of fluorescence echlorophyll parameters under drought stress.The results showed that actual photochemical quantum (Yield),the maximum photochemical efficiency of PSⅡ(Fv/Fm)and photochemical quenching coefficient (qP)decreased gradually with the increase of drought stress level,by contrast,the primary fluorescence (Fo)and non-photochemical quenching coefficient(qN)increased obviously.But each parameter varied differently between clones under drought stress.The changes were slower and the damage of photosynthetic apparatus were lighter in drought-resistance clones,indicating that there was a closed relationship between the effects of drought stress on chlorophyll fluorescence parameters of different clones and its drought-resistance.