Effects of Shading on Growth and Photosynthetic Characteristics of Eggplant Seedling

Effects of shading on growth and photosynthesis were conducted in eggplant seedling.The results showed that plant height was higher,but stem diameter,specific leaf weight(SLW) and SPAD value under shading condition were lower than those of control.Light saturation point(LSP),light compensation point(LCP),photosynthet-ic rate at light saturation point and apparent quantum yield(AQY) significantly became lower under low light stress.The curves of diurnal variation in net photosynthetic rate(Pn) have two peaks(at 9: 00 and 11: 00),a midday depres-sion under full sunlight;whereas under shading treatment,the curve has only one peak at 11: 00.Leaf stomata1 con-ductance(Gs),the transpiration rate(Tr),water use efficiency(WUE) and stomatal limitation(Ls) were decreased un-der shading,while intercellular CO2concentration(Ci) were increased.The results above indicated the growth and pho-tosynthesis of eggplant were inhibited,which affected the development of the photosynthetic organs,and the photosyn-thetic capacity was declined and normal growth was inhibited,and the inhibition was decreased with increasing of shade degrees.