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花后渍水高温交互效应对冬小麦旗叶光合特性及产量的影响 预览 被引量:29

Effect of Interaction of Waterlogging and High Temperature after Anthesis on Photosynthetic Characteristics of Flag Leaf and Yield in Winter Wheat
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摘要 渍水和高温是长江中下游麦区冬小麦(TriticumaestivumL.)生育中后期的主要气象灾害因子。2009-2011年连续2个生长季盆栽烟农19,在籽粒形成期(花后5-8d)和乳熟期(花后15-18d)分别设渍水(土表水层lcm)、高温[昼(35±2)℃,夜(25±2)℃和渍水+高温处理,探讨了渍水和高温双重胁迫对小麦开花后光合特性及产量的影响。结果表明,花后渍水、高温、渍水+高温逆境均显著降低旗叶净光合速率(Pn)、叶绿素含量(SPAD值)、气孔导度(Gs)和蒸腾速率(Tr),增加胞问CO2浓度(Ci);同时降低穗粒数、千粒重及产量,但对成穗数影响不显著。渍水和高温胁迫对旗叶光合作用的主要限制因素是非气孔因素。从产量平均相对受害率看,其影响为渍水+高温逆境(37.7%)〉渍水逆境(21.1%)〉高温逆境(17.6%),而胁迫时期的影响为籽粒形成期(30.8%)〉乳熟期(20.1%)。渍水和高温的交互效应显著,且籽粒形成期逆境不良效应显著大于乳熟期。 Waterlogging and high temperature are main stress factors during late growing period of winter wheat (Triticum aesti- vum L.) in Yangtze Valley region of China. To understand the effect of interaction of waterlogging and high temperature on pho- tosynthetic characteristics and grain yield of wheat, we carried out a pot experiment, using the variety of Yannong 19, in continu- ous growing seasons from 2009 to 2011. At grain-forming (5-8 d after anthesis) and milking (15-18 d after anthesis) stages, wa- terlogging (1 cm of surface water layer), high temperature (35±2℃ of daytime/25±2℃ of nighttime), and waterlogging + high temperature stresses were imposed to wheat plants, separately. Waterlogging, high temperature, and both stresses showed signifi- cantly effects on photosynthetic characteristics of flag leaf and yield reducing photosynthetic rate (P~), chlorophyll content (SPAD reading), stomatal conductance (Gs), and transpiration rate (Tr); enhancing intercellular CO2 concentration (Ci); and declining grain number per spike, 1000-grain weight, and grain yield. However, in the case, spike number per pot was not affected signifi- cantly. Thus, the effects of waterlogging and high temperature on Pn did not result from stomata factor of flag leaf. The average relative injury rates (RIR) of yield were 37.7% for waterlogging + high temperature treatment, 21.1% for waterlogging treatment, and 17.6% for high temperature treatment. Stress showed higher RIR at grain forming stage (30.8%) than at milking stage (20.1%) There was significant interaction between waterlogging and high temperature, and grain-forming stage was more sensitive to the interaction than milking stage.
作者 吴进东 李金才 魏凤珍 王成雨 张一 武文明 WU Jin-Dong, LI Jm-Ca, WEI Feng-Zhen, WANG Cheng-Yu, ZHANG Yi, and WU Wen-Ming Agricultural College, Anhui Agricultural University, Hefei 230036, China; 2 West Anhui University, Lu'an 237012, China
出处 《作物学报》 CAS CSCD 北大核心 2012年第6期 1071-1079,共9页 Acta Agronomica Sinica
基金 本研究由国家自然科学基金项目(31071356),安徽省教育厅自然科学基金重点项目(KJ2011A271)和国家公益性行业(农业)科研专项(201203079,201203100)资助.
关键词 冬小麦 渍水 高温 渍水高温交互效应 光合特性 产量 Winter wheat Waterlogging High temperature Interaction Photosynthetic characteristics Grain yield
作者简介 E—mail:Wujindong@wxc.edu.cn 李金才,E—mail:lie5122423@126.com
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