Title: Effects of shading on squash seedlings' morphological and photosynthetic physiological characteristics.
Abstract: The study of squash seedlings' morphological and photosynthetic physiological characteristics under different shading showed that under 60% light transmittance,their relative growth rate,net photosynthetic rate(P_n),stomatal conductance(G_s),transpiration rate(EVAP),water use efficiency(WUE),saturation steam pressure(MBR),apparent quantum yield of photosynthesis(AQY),and chlorophyll contents were higher,while the intercellular CO_2 concentration(C_i) was lower,compared with those under 20% light transmittance and CK.The seedlings under 60% light transmittance had a higher light saturation point(1 125 μmol·m~(-2)·s~(-1)) but a lower light compensation point(15.2 μmol·m~(-2)·s~(-1)).Squash seedlings under lower light intensity could endure lower concentration of CO_2,while those under higher light intensity could endure higher concentration of CO_2.Under 60% light transmittance,the malondialdehyde(MDA) and praline(Pro) contents were the lowest,while the peroxidase(POD) and catalase(CAT) activities were the highest.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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