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水分亏缺下春小麦叶片光合色素含量与能量转化的关系及其磷素调节机制

发表时间:2009-08-31  浏览量:1552  下载量:741
全部作者: 于显枫,张绪成,张国宏
作者单位: 甘肃省农业科学院旱地农业研究所,农业部西北作物抗旱栽培与耕作重点开放实验室
摘 要: 通过对盆栽春小麦不同生育期功能叶片光合色素和叶绿素荧光参数的测定,研究水磷互作对春小麦全生育期叶片光合色素含量和叶绿素荧光参数的影响,并进一步探讨光合色素与净光合速率的关系。试验结果表明:不同水分条件下,随着施磷量的增加,小麦叶片叶绿素含量表现为拔节—扬花期迅速上升,灌浆期后迅速下降。叶绿素含量与光合速率呈显著正相关,增施磷肥有利于提高小麦叶片的叶绿素含量,从而提高小麦叶片的净光合速率。在抽穗和扬花期,3种水分处理的小麦叶片电子传递速率(electronic transmission rate,ETR)均表现为高磷处理的最高,显著高于对照和中磷处理。在丰水和中度干旱条件下,高磷和中磷处理的小麦各生育期的叶片PSⅡ总光化学量子产量(yield)显著高于对照处理。在中度干旱和严重干旱条件下,高磷和中磷处理的小麦叶片光化学猝灭系数(qP)显著高于对照,而在丰水条件下,3种处理基本相等。施磷能够显著提高光合机构开放比例、捕捉光量子的能力和电子传递速率,从而改善光合机构效能。
关 键 词: 农艺学;水磷互作;光合色素;荧光特性;春小麦
Title: The relationship between photosynthetic pigment and light energy transformation of spring wheat and its mechanism regulated by phosphor under dry conditions
Author: YU Xianfeng, ZHANG Xucheng, ZHANG Guohong
Organization: Key Laboratory of Northwest Drought-resistant Crop Farming, Ministry of Agriculture, PRC, Dryland Agriculture Institute, Gansu Academy of Agriculture Sciences
Abstract: The effects of interaction between soil moisture and phosphor on photosynthesis, and the relationship between photosynthetic pigments and net photosynthetic rate had been studied by measuring the photosynthetic pigment and chlorophyll fluorescence parameters in different growth stages of spring wheat in this potted experiment. The results showed that the leaf chlorophyl content increased as the phosphorus application increased from jointing to flowering stage under different water conditions, but decreased in the filling stage. There was significant positive correlation between photosynthetic rate and leaf chlorophyl content, increasing the phosphorus application is beneficial to increasing leaf chlorophyl content and net photosynthetic rate. The electronic transmission rate (ETR) was highest at high phosphor treatment in heading and flowering stage under the three water conditions, higher than the middle phosphor treatment and the control significantly. The yield of PSⅡ of high and middle phosphor treatment was significantly higher than the control under the wettish and moderate drought conditions. qP of high and middle phosphor treatment was significantly higher than the control under the moderate and severe drought conditions, but there was no significant difference under wettish condition. The phosphorus application can increase ETR, yield and qP significantly, and then ameliorate the efficiency of photosynthetic apparatus.
Key words: agronomy; interaction between soil moisture and phosphor; photosynthetic pigment; fluorescent characteristics; spring wheat
发表期数: 2009年8月第16期
引用格式: 于显枫,张绪成,张国宏. 水分亏缺下春小麦叶片光合色素含量与能量转化的关系及其磷素调节机制[J]. 中国科技论文在线精品论文,2009,2(16):1673-1680.
 
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