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不同形态氮素营养对小麦光合特性的影响
引用本文:洪法水,方能虎,赵贵文.不同形态氮素营养对小麦光合特性的影响[J].作物学报,2000,26(1):53-58.
作者姓名:洪法水  方能虎  赵贵文
作者单位:河北农业大学农学系, 河北保定071001
基金项目:“八五”农业部重点应用基础研究项目
摘    要:不同形态氮素营养相比, 叶片的叶绿素含量(Ch1)、 光合速率(Pn)、 RuBPcase初始活性、 RuBPcase含量、 叶肉导度(gm)、 碳酸酐酶(CA)活性、 PSⅠ活性和PSⅡ活性均以NH+4+NO-3混合处理较高, NO-3处理次之, NH+4处理较低。 不同处理间的RuBPcase比活性没有明显差异。 各氮素处理的气孔导度(gs)与对照相比差异较小。 氮素营养

关 键 词:不同形态氮素  光合作用  生理机制
收稿时间:1998-12-25
修稿时间:1999-03-07

The Effects of Different Nitrogen Nutrition Forms on Photosynthetic Characteristics in Wheat Leaves
XIAO Kai,ZHANG Shu-Hual,ZOU Ding-Hui,ZHANG Rong-Xian.The Effects of Different Nitrogen Nutrition Forms on Photosynthetic Characteristics in Wheat Leaves[J].Acta Agronomica Sinica,2000,26(1):53-58.
Authors:XIAO Kai  ZHANG Shu-Hual  ZOU Ding-Hui  ZHANG Rong-Xian
Institution:Department of Agronomy, Hebei Agricultural University, Baoding, 071001
Abstract:In three different nitrogen treatments, the chlorophyll content(Ch1), photosynthetic rate(Pn), RuBPcase initial activity, RuBPcase content, mesophyll conductance(gm), carbonic anhydrase (CA) activity, PS Ⅰ activity and PS Ⅱ activity of leaves were the highest in the mixture treatment of NH+4+NO-3, then were in the NO-3 treatment and the lowest were in NH+4 treatment. No evident differences were found in RuBPcase specific activity among treatments. There was little difference on stomatol conductance(gs) between different treatments and CK. Nitrogen nutritions decreased the intercellular CO2 concentration (Ci). There were similarly changing trends between gm, CA activity and photosynthetic rate(Pn) in different treatments, which showed the conductivity of CO2 in liquid part of mesophyll cell having probably important influence on photosynthesis of leaves. Compared to NH+4 treatment, NO-3 treatment increased the photorespiration rate, the ratio of photorespiration rate to photosynthetic rate and nitrate reductase(NR) activity in wheat leaves. The increase of photosynthetic rate in mixture treatment NH+4+NO-3 was mainly correlated to the higher RubisCO activity, higher photosynthetic electron conductivity and the improvment of CO2 conductivity in liquid phase of mesophall cell.
Keywords:Different form nitrogen  Photosynthesis  Physiological mechanism
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