植物生长调节剂对油菜生长及冻害后光合作用和产量的调控效应

doi:10.3724/SP.J.1006.2009.01336

Abstract

Abstract:

Different contents of exogenous hormones were applied on rapeseed at the initial blossoming stage. The net photosynthetic rate (P_n) and yield were investigated. In January 2008, a heavy snow and low temperature for a period destroyed crops including winter rape. In this experiments exogenous hormones ABA and BR with optimal contents were applied on the rapeseed (Brassica napus L.) plants after the frozen from the worst weather. The gas exchange parameters and chlorophyll fluorescence characteristics of leaves as well as the regularity of pod size changes and yield components were determined. The results were as follows: ABA (76×10^-6mol L^-1)and BR(1×10^-6mol L^-1) could delay the decreasing of net photosynthetic rate (P_n) in short petiole leaves. The P_n, stomatal conductance (G_s), intercellular CO₂ concentration (C_i), transpiration rate (T_r) and photosynthetic saturated light intensity (LSP) were increased after exogenous hormones treatment. ABA and BR treatments also caused a significant increase in the maximus photchemical efficiency of photosystem II (F_v/F_m), the quantum yield of electron transport (Φ_PSII), the photochemical quenching co-efficient (q_P), Chl content and soluble protein content. These changes were accompanied by the decline in both minimal fluorescence (F_o) and non-photochemical quenching co-efficient (NPQ). The pod surface areas per pod were increased. The number of the first branches per plant and seeds per pod and 1000-seed weight were raised, resulting in improvement of yield after BR treatment. As to the plants after ABA treatment, the high yield was mainly attributed to the increasing of seeds per pod and 1000-seed weight. In conclusion, ABA (76×10^-6mol L^-1) and BR (1×10^-6mol L^-1) treatments are effective on promoting the growth and relieving the negative effects of frozen on rapeseed.

Key words: Rapeseed(B.napus L.), Frozen, Exogenous hormone, Photosynthesis, Yield

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Regulation Effects of Exogenous Hormones on Growth and Photosynthesis and Yield of Rapeseed（Brassica napus L.）after Frozen

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