《植物生理学报》 2013, 49(11): 1181-1188

外源6-BA对低温胁迫下茄子幼苗光合作用、叶绿素荧光参数及光能分配的影响

吴雪霞, 杨晓春, 朱宗文, 查丁石*, 许爽

上海市农业科学院园艺研究所, 上海市设施园艺技术重点实验室, 上海201106

通信作者：查丁石；E-mail: dingshizha@aliyun.com；Tel: 021-37195817

摘　要：

本文研究了外源6-BA对低温胁迫下茄子幼苗光合作用、叶绿素荧光参数和能量分配的影响。结果表明, 外源6-BA显著增加了低温胁迫下茄子叶绿素含量、净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)和胞间CO2浓度(Ci); 同时外源6-BA明显提高了低温胁迫下茄子幼苗叶片的PSII最大光化学效率(Fv/Fm)、PSII潜在活性(Fv/Fo)、PSII天线转化效率(Fv′Fm′)、实际光化学效率(ΦPSII)、光化学猝灭系数(qP)和光化学反应能量(P), 降低了非光化学猝灭系数(NPQ)、天线热耗散能量(D), 对非光化学反应耗散能量(E)无明显影响。表明外源6-BA处理通过促进低温胁迫下茄子幼苗光合作用, 提高光合电子传递效率, 从而保护光合系统, 降低低温胁迫对植物的损伤。

关键词：外源6-BA; 茄子; 低温胁迫; 光合作用; 叶绿素荧光参数; 能量分配

收稿：2013-08-19   修定：2013-10-16

资助：上海市科技成果转化项目(123919N0200)和现代农业产业技术体系建设专项资金(CARS-25)。

Effects of Exogenous 6-BA on Photosynthesis, Chlorophyll Fluorescence Characteristics and the Allocation of Absorbed Light in Eggplant Seedlings under Low Temperature Stress

WU Xue-Xia, YANG Xiao-Chun, Zhu Zong-Wen, ZHA Ding-Shi*, XU Shuang

Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai Key Laboratory of Protected Horticultural Technology, Shanghai 201106, China

Corresponding author: ZHA Ding-Shi; E-mail: dingshizha@aliyun.com; Tel: 021-37195817

Abstract:

The effects of exogenous 6-BA on photosynthesis, chlorophyll fluorescence characteristics and the allocation of absorbed light in eggplant seedlings under low temperature stress were investigated. The results showed that 6-BA significantly induced contents of chlorophyll, net photosynthetic rate (P_n), transpiration rate (T_r), stomatal conductance (G_s), and the intercellular CO₂ concentration (C_i). And 6-BA significantly increased photochemical efficiency of photosystem II (F_v/F_m), potential photochemical efficiency (F_v/F_o), excitation capture efficiency of open centers (F_v'F_m'), actual photochemical efficiency (Φ_PSII), photochemical quenching coefficient (q_P) and the fraction of photochemical efficiency (P). However, 6-BA decreased non-photochemical quenching coefficient (NPQ), the fraction of antenna heat dissipation (D), while 6-BA had no remarkable effects on excess energy (E). This then suggests that 6-BA increases photosynthesis, improves photochemical electron transport efficiency, and thereby protected eggplant seedlings against low temperature-induced damages.

Key words: exogenous 6-BA; eggplant (Solanum melongena L.); low temperature stress; photosynthesis; chlorophyll fluorescence characteristics; allocation of absorbed light