不同形态钙对高温逆境下番茄叶片光合作用的调控作

以‘辽园多丽’番茄幼苗为试材,在高温胁迫下喷施氯化钙(CaCl₂)、纳米钙(Nano-Ca)和糖醇钙(Manntiol-Ca),研究不同形态钙处理对高温逆境下番茄叶片光合作用的调控作用.结果表明: 不同形态的钙处理均可抑制高温逆境下叶片中叶绿素a和类胡萝卜素含量的下降;显著提高净光合速率(P_n),不同程度提高蒸腾速率(T_r)和气孔导度(g_s);降低PSII非调节性能量耗散的量子产量\Y(NO)\]和由于受体侧限制引起的PSI非光化学能量耗散的量子产量\Y(NA)\],提高PSII调节性能量耗散的量子产量\Y(NPQ)\]和由于供体侧限制引起的PSI非光化学能量耗散的量子产量\Y(ND)\];提高叶片中钙含量;Manntiol-Ca和Nano-Ca处理的总体效果优于CaCl₂处理.与CaCl₂相比,Manntiol-Ca和Nano-Ca是提高高温逆境下番茄叶片光合作用更有效的钙制剂.

Regulation of different calcium forms on the photosynthesis of tomato leaves under heat stress.

The regulation of different calcium forms, namely CaCl₂, Nano-calcium and Manntiol-calcuim, on the gas exchange and fluorescence of tomato leaves under heat stress was investigated. The results showed that all forms of calcium alleviated the decrease of chlorophyll a and carotenoid contents in leaves of tomato seedlings under heat stress, enhanced the net photosynthesis rate (P_n), transpiration rate (T_r) and stomatal conductance (g_s) to varying degrees, reduced the quantum yield of non-regulated energy dissipation \Y(NO)\] of PSII and quantum yield of non-photochemical energy dissipation in PSI due to acceptor side limitation \Y(NA)\], promoted the regulated energy dissipation \Y(NPQ)\] and quantum yield of non-photochemical energy dissipation in PSI due to donor side limitation \Y(ND)\], and increased the calcium content in leaves. Generally, manntiol-calcium and nano-calcium were more effective than CaCl₂, and more suitable to enhance the photosynthesis of leaves oftomato seedlings under heat stress.