摘要
研究了两个冬小麦品种(济南17和鲁麦21)的叶片氮素含量动态变化及其转运效率对4个土壤水分水平分别占土壤最大持水量的75%～80%、55%～60%、40%～45%及30%～35%)的响应。结果表明:中度和严重土壤干旱显著降低了叶片相对含水量、叶绿素含量、光合速率、气孔导度、氮素含量和生物产量,但中度干旱提高了叶片氮素转运效率和籽粒蛋白质含量。尽管高蛋白小麦品种济南17叶片的氮素含量较低,但氮素转运效率较高,适度土壤干旱对其籽粒蛋白质的激发作用亦较强。表明适度土壤水分亏缺可促进叶片氮素向籽粒运转,有利于改善小麦品质。
In the experiment, nitrogen level and its translocation efficiency in the flagleaves of two wheat cultivars (cv. Jian 17 and Lumai 21) were studied at four soil moisture levels. Moderate and severe soil drought significantly decreased the relative water content, chlorophyll content, photosynthetic rate, stomatal conductance, nitrogen level and yield, but moderate drought increased nitrogen efficiency and grain protein content. The cultivar with high grain protein content had higher nitrogen efficiency, although its nitrogen content in flag leaves was lower, which showed that soil drougnt sharply stimulated the accumulation of grain protein. It is suggested that moderate soil water deficit may enhance nitrogen translocation from leaves to grains so that the grain quality improves.
出处
《干旱地区农业研究》
CSCD
北大核心
2004年第4期75-79,91,共6页
Agricultural Research in the Arid Areas
基金
国家重点基础研究发展规划项目(G1999043407)
中国科学院创新工程项目(KZCXI-SW-01-12
KSCX2-1-07)
国家自然科学基金项目(40231018)
