氮素水平对棉花幼苗生长和光合特性的影响  

Effects of Nitrogen Concentrations on Cotton(Gossypium hirsutum L.) Seedling Growth and Photosynthetic Characteristics

作　　者：陈静[1] 刘连涛[1] 孙红春[1] 张永江[1] 王占彪[1] 李存东[1] 

机构地区：[1]河北农业大学/河北省作物生长调控重点实验室,河北保定071000

出　　处：《棉花学报》2013年第5期403-409,共7页Cotton Science

基　　金：国家自然科学基金(30370833;31171495);河北省重点基础研究(10960206D);河北省自然科学基金(C2010000729);河北省高等学校科学技术研究指导项目(Z2012098)

摘　　要：为研究氮素水平对棉花幼苗生长和光合特性的影响,测定了营养液培养下棉苗的生长指标、叶绿素含量及光合作用参数等指标。结果表明:棉花幼苗地上部干重、叶绿素a+b、叶绿素a/b、净光合速率、气孔导度、蒸腾速率、PSII的潜在活性、PSII光化学最大效率均随氮浓度的增加呈先升高后降低趋势。棉花幼苗生长的最适宜氮浓度为4 mmol·L-1;随处理时间延长,处理间差异先增加后减少,处理第12天时,除根冠比外,各指标均与氮浓度极显著相关;气孔导度和净光合速率对氮素的响应最为灵敏;鲁棉研28各光合指标下降程度大于银瑞361和农大棉8号,3个品种对氮素敏感性依次为:鲁棉研28>银瑞361>农大棉8号。Cotton seedling growth and photosynthesis and chlorophyll fluorescence indexes under different nitrogen concentrations were determined in indoor solution cultures. The results revealed that dry matter accumulation, chlorophyll （a＋b）, chlorophyll a/b, net photosynthetic rate, stomatal conductance, transpiration rate and fluorescence characteristics of cotton seedlings at first increased and then decreased with the increase of nitrogen concentration. The most suitable nitrogen concentration for cotton seedling growth was 4 mmol·L^-1. The highest significant correlation between the indexes and nitrogen concentration was observed after 12 days of treatment. The most sensitive indexes were those of stomatal conductance and net photosynthetic rate. The photosynthesis indexes in Lumianyan 28 decreased more than those of Yinrui 361 and Nongdamian 8. Lumianyan 28 was the most sensitive variety, Nongdamian 8 the least sensitive variety, Yinrui 361 was mid-range.

关 键 词：氮素 棉花幼苗 生长 光合特性 

分 类 号：S562[农业科学—作物学]