【摘要】 在田间试验条件下,研究了不同抗旱性小麦品种全生育期叶片光合色素含量和叶绿素荧光参数的关系及其氮素响应。结果表明,光合色素各组分含量随施氮量增加有明显的升高趋势,品种间差异又因生育时期而不同;施氮显著提高了拔节期实际光化学效率(ФPSⅡ)和光化学猝灭系数(qP)、扬花期和灌浆期的最大光化学效率(Fv/Fm),降低了全生育期非光化学猝灭系数(qN)。提高叶绿素a含量能显著提高叶片ФPSⅡ、Fv/Fm、qP和降低qN;叶绿素b含量的升高能显著增强热耗散,增加类胡萝卜素含量则促进水地品种叶片光能的光合碳同化作用和旱地品种的热耗散。拔节期对照处理的旱地品种的ФPSⅡ和qN显著高于水地品种,在该时期品种抗旱性差异表现较为明显,能够通过提高光合机构实际光化学效率和热耗散来增强光合机构对干旱的适应能力。更多还原

【Abstract】 The relationship between the content of photosynthetic pigment and chlorophyll fluorescence parameters,and their response to nitrogen fertilization were investigated during the whole growth period of two drought-resis tance wheats on field experiment.Results showed that the content of photosynthetic pigment components was increased with the increasing of nitrogen fertilizer,but it was differed in different growing stages for two cultivars.Nitrogen fertilization could increase the Ф_PSⅡ,qP in jointing stage,the Fv/Fm in flowering and ripening stage,and decrease qN in the whole growing stages significantly.The Ф_PSⅡ,Fv/Fm and qP were increased but qN was decreased with increasing of chlorophyll a,the rate of heat dissipation was increased with the increasing of chlorophyll b,and the carotinoid increasing enhanced the rate of heat dissipation of dryland and carbon assimilation of irrigated cultivar.The Ф_PSⅡ and qN of dryland cultivar treated by control were higher than that of irrigated cultivar in jointing stage significant,indicating that the characteristics of drought-resistantce of winter wheat could be displayed in the jointing stage,and the drought-resistant capability could be increased by enhancing the practical photochemistry efficiency and heat dissipation in jointing stage.更多还原