外源水杨酸对UV-B增强下花生叶片光合特性的影响

doi:10.3969/j.issn.1000-6362.2016.04.008

摘要/Abstract

摘要： 通过大田模拟试验，设置自然光（CK）和UV-B辐射增强（E，增加量相当于当地4-5月UV-B辐射量的20%）两个大区，在每个大区内又分2个小区，从花针期（7月25日）开始，分别用蒸馏水（S0处理）和水杨酸水溶液（SA处理）连续3d在固定时段喷施花生植株的所有叶片后，用Li-6400型便携式光合作用测定仪观测和计算指定叶片的净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）、胞间CO2浓度（Ci）和水分利用效率（WUE）的日变化过程，并进行对比分析。结果表明：不施水杨酸条件下（S0），UV-B增强处理的花生叶片Pn、Tr、Gs和WUE的日均值比自然光（CK）处理分别下降35.7%、25.0%、25.0%、10.0%；而喷施水杨酸条件下（SA）则分别下降30.4%、17.9%、33.3%、19.4%，说明UV-B增强可降低花生叶片的净光合速率、蒸腾速率、气孔导度和水分利用效率，而喷施水杨酸可缓解UV-B增强对花生净光合速率的抑制作用，但并不能缓解UV-B增强对花生蒸腾作用、气孔导度及水分利用效率的抑制。

关键词: UV-B辐射, 水杨酸, 花生, 光合作用, 蒸腾作用

Abstract:

A field experiment was conducted to investigate the effects of exogenous salicylic acid on diurnal variations of the net photosynthetic rate (Pn), transpiration rate (Tr), stomata conductance (Gs), intercellular CO2 concentration(Ci), and leaf water use efficiency (WUE) of peanuts leaves at acicula forming stage under the enhanced UV-B with a portable photosynthesis system (LI-6400, USA). Two plots, i.e., the natural light plot and UV-B radiation enhancement plot (E, increase the amount equivalent to local 4-5 months), was set, both with two small plots be sprayed respectively with distilled water (S0) and salicylic acid (SA) for 3 days in a fixed period from the acicula forming stage (July 25). The results showed that, compared with CK, the Pn, Tr, Gs, and WUE of peanuts leaves under S0 treatment with 20% enhanced UV-B radiation decreased 35.7%, 25.0%, 25.0% and 10.0%, and then those of SA treatment decreased 30.4%, 17.9%, 35.3% and 19.4%, respectively. The results indicated that the net photosynthetic rate, transpiration rate, stomata conductance, and water use efficiency of peanuts leaves could be reduced under enhanced UV-B radiation, and the salicylic acid could relieve the inhibitory effect of UV-B radiation on net photosynthetic rate. However, it could not relieve the inhibitory effect of UV-B radiation on the transpiration rate, stomata conductance, and water use efficiency of peanuts leaves.

Key words: UV-B radiation, Salicylic acid, Peanut, Photosynthesis, Transpiration

韩艳，韩晨光，崔荣华，宁澍楠. 外源水杨酸对UV-B增强下花生叶片光合特性的影响[J]. 中国农业气象, 2016, 37(04): 437-444.

HAN Yan, HAN Chen-guang, CUI Rong-hua, NING Shu-nan. Effects of Exogenous Salicylic Acid on Photosynthetic Characteristics of Peanut Leaves under Elevated UV-B Radiation[J]. Chinese Journal of Agrometeorology, 2016, 37(04): 437-444.

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