不同光质补光对火龙果茎生理特性及开花结果的影响

Effects of different supplemental light qualities on physiological characteristics, flowering and fruiting of pitaya stem

关键词:  火龙果, 光质, 补光, 茎, 生理特性, 开花结果

Key words:  pitaya, light quality, light supplement, stem, physiological characteristics, flowering and fruiting

摘要:

为探究不同光质补光对火龙果茎生理特性的影响,该文采用红光、白光、蓝光3种不同光质对火龙果进行夜间补光,测定火龙果茎中可溶性糖、可溶性蛋白、叶绿素、线粒体蛋白、线粒体膜电位及细胞分裂素(CTK)、吲哚乙酸(IAA)、赤霉素(GA)3种内源激素的含量,并统计茎长、开花数、果实产量相关指标。结果表明:3种光质补光均可提高火龙果植株可溶性蛋白质含量,补白光效果最佳; 3种光质补光均可显著提高火龙果植株可溶性糖的含量,补蓝光效果最佳; 补白光有利于叶绿素a和叶绿素b的含量增加,补红光对其影响不显著,而补蓝光会降低其含量; 补白光和蓝光均能显著降低CTK含量,补白光和红光均能显著提高IAA含量,补红光和蓝光均能显著提高GA含量; 补白光显著降低线粒体蛋白含量,3种光质补光对线粒体膜电位均无明显影响; 3种光质补光对火龙果茎的生长无显著影响,补红光和白光能显著提高开花率,补红光能显著提高果实产量。综上认为,补红光与白光对火龙果茎代谢产物、叶绿素、内源激素含量及开花数、果实产量有较明显的促进作用,该研究结果可为光质调控技术促进火龙果植株的生长发育、开花结果提供借鉴。

Abstract:

To investigate the effects of different supplemental light qualities on physiological characteristics of pitaya stems, red, white and blue lights were used as supplemental light sources at night. The contents of soluble sugar, soluble protein, chlorophyll, mitochondrial protein, mitochondrial membrane potential and three endogenous hormones(CTK, IAA, GA)were determined. The indicators of stem growth, flowering, fruit yield were counted. The results were as follows: Supplementing the three kinds of light could all increase the soluble protein contents in pitaya stems, and the white light had the best effect; Supplementing the three kinds of light could all significantly increase soluble sugar contents in pitaya stems, and the blue light had the best effect; Supplementing white light was beneficial to increase the contents of chlorophyll a and b, and supplementing red light had no significant effect on it, while blue light would reduce its content; Supplementing white light and blue light could significantly reduce the CTK contents, supplementing white light and red light could significantly increase the IAA contents, and supplementing red light and blue light could significantly increase the GA contents; Supplementing white light could significantly reduce the mitochondrial protein contents and the three kinds of supplement light had no obvious effect on the mitochondrial membrane potential; Supplementing the three kinds of light had no significant effects on the growth of pitaya stems, while supplementing red light and white light could significantly increase the flower formation rate, and supplementing red light could significantly increase the fruit yield. Comprehensive analysis deemed that supplementing red light and white light had obvious promoting effect on the contents of metabolites, chlorophyll, endogenous hormones of pitaya stems, flower formation rate and fruit yield. The research results can provide a reference for a technology of light quality controlling to improve the growth and development pitaya plants.