Physiological adaptation of cucumber seedlings to different fluctuating light environments
In this study,'Jinyou 35'cucumber(Cucumis sativus)seeding was used as the experimental ma-terial,and three light treatments,including steady state light(CK),moving light(YD)and frequent flash light(PS),were set up under the same daily light integral and photoperiod,in order to investigate the ef-fects of different fluctuating light strategies on the physiology and biochemistry of cucumber seedlings.The results show that,YD and PS treatments significantly reduced the plant height,seedling index,fresh and dry weights of shoot and root,root growth and root vigor of cucumber seedlings;compared with CK,which were not optimal to the cultivation of strong seedlings.Furthermore,YD and PS treatments also sig-nificantly reduced the maximum net photosynthetic rate(Pn,max)and electron transfer efficiency(φEo)of cu-cumber seedlings,and down-regulated the expression of related genes psbA,Cytb6/f and psaA,which in-hibited the photosynthetic capacity of plants.Compare to CK and YD treatments,PS reduced the leaf tissue structure tightness(CTR),apparent quantum efficiency(AQY)and light energy absorbed per reac-tion center(ABS/RC),and down-regulated LHCLL gene expression while increased chlorophyll a/b and light compensation point(LCP),but relatively higher stable light intensity increased the number of active reaction centers per unit area(RC/CSo).In summary,in the process of factory nursery we should pay more attention to the duration of high and low fluctuating light,and accurately regulate the light environment of plant growth through intelligent equipment.
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