膜荚黄芪与蒙古黄芪幼苗的光能利用及其耐光性研究

以盆栽膜荚黄芪和蒙古黄芪幼苗为试验材料,测量2种黄芪叶片的光合速率、叶绿素荧光参数、光能利用率及耐光性等指标的日变化,以探讨它们的光能利用、热耗散以及耐光性差异.结果表明:(1)随着太阳光合有效辐射的日变化进程推进,2种黄芪的初始荧光(F0)、非光化学淬灭(NPQ)、PSⅡ调节性能量耗散量子产最(YNPQ)先升高后降低...

Light Use,Heat Dissipation and Light Patience of Astragalus membranaceus var. membranaceus and A.membranaceus var. mongholicus Seedlings

The parameters of day light use,heat dissipation and the light patience of Astragalus membranaceus var.membranaceus and Astragalus membranaceus var.mongholicus were investigated in seedling stage.With var.membranaceus and var.mongholicus as experiment materials through the pot experiment,chlorophyll fluorescenc use of day light,heat dissipation and the light patience were investigated whole day in early summer.The minimal fluorescence(F0),non-photochemical quenching(NPQ),PSⅡ regulatory quantum yield of energy dissipation(YNPQ) were increased and then decreased in two varieties of Astragalus,and the maximum appeared at noon;the maximum photochemical efficiency(Fv/Fm),PSⅡ potential activity(Fv/F0),actual photochemical efficiency(ΦPSⅡ),photochemical quenching(qP),PSⅡ non-regulatory energy dissipation in quantum yield(YNO) of two varieties of Astragalus were decreased and then increased.The lowest values were in the maximum light intensity,var.mongholicus is always greater than var.membranaceus.The excess excitation energy(E) less the case;var.mongholicus energy absorbed PSⅡ antenna pigments in the photochemical reactions for the relative share(P) of the daily average and the strongest light are significantly greater than var.membranaceus;capsule antenna pigment of var.membranaceus relative share of heat dissipation(D) is always greater than that of var.mongholicus.The initial slope of var.membranaceus(α) is larger than that of var.mongholicus slightly.But var.mongholicus maximum electron transport rate(ETRmax),the smallest saturation intensity(EK) are higher than that of var.membranaceus.The seedlings of var.membranaceus and var.mongholicus can growth normally in high light in early summer,but the photochemical efficiency,the relative share of photochemical reactions,PSⅡ electron transport activity,the light patience of var.mongholicus are higher than var.membranaceus.