| 张 洋，翟丙年.水分胁迫条件下氮素营养对不同冬小麦基因型的生理效应[J].麦类作物学报,2010,30(3):492 |
| 水分胁迫条件下氮素营养对不同冬小麦基因型的生理效应 |
| Physiological Effects of Nitrogen on Different Winter Wheat Genotypes under Water Stress |
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| DOI：10.7606/j.issn.1009-1041.2010.03.020 |
| 中文关键词: 冬小麦 水分胁迫 施氮 基因型 生理特征 |
| 英文关键词:Winter wheat Water stress Nitrogen application Genotypes Physiological characteristic |
| 基金项目:西北农林科技大学“青年学术骨干”人才专项（01140305）和科研专项（08080265）；国家863项目（2006AA1002）；国家支撑计划项目（2008BADA4B09）；国家小麦现代产业技术体系建设专项。 |
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| 中文摘要: |
| 为给旱地小麦高产栽培和氮素高效利用提供依据，以水氮高效型品种小偃22和水氮低效型品种小偃6号为供试材料，通过水培试验，研究了水分胁迫下介质氮素营养对冬小麦幼苗根系和冠层干重、叶片相对含水量、根系活力、叶片叶绿素含量（SPAD值）等生理指标的影响。结果表明，水分胁迫和介质氮素供应对小麦幼苗各生理指标均有显著影响。水分胁迫下，介质供氮显著提高冠层干重、叶片相对含水量、根系活力及叶片叶绿素含量，降低根干重。而在供氮条件下，水分胁迫导致小偃22根系和冠层干重均明显降低，而小偃6号根系和冠层干重均明显增加，两个品种的叶片相对含水量（P<0.05）和根系活力（P>0.05）显著降低，培养阶段前期的叶片叶绿素含量提高。在介质缺氮条件下，水分胁迫使小偃22和小偃6号冠层干重分别增加和下降，两个品种根干重和叶片叶绿素含量均明显下降，叶片相对含水量和根系活力均增加。说明改善介质氮素营养可增强水分胁迫下小麦抗旱能力，促进冠层干物质积累，同时也增大小偃22根、苗干物质积累和两个品种叶片相对含水量对水分胁迫的敏感性，而降低了小偃6号根系和冠层干物质积累及两个品种根系活力和叶绿素含量对水分胁迫的敏感性。 |
| 英文摘要: |
| The solution culture experiment was conducted to study the effects of water stress and nitrogen application on growth and development of different winter wheat genotypes (nitrogen high effective variety Xiaoyan 22 and low effective variety Xiaoyan 6) by investigating the influence of canopy dry weight, root dry weight，RWC，root activity，leaf chlorophyll content with medium nitrogen application under water stress at seedling stage. The results showed that canopy dry weight, RWC, root activity，leaf chlorophyll content were significantly increased under nitrogen application and water stress; root dry weight increased under nitrogen stress; RWC and root activity increased under nitrogen stress and water stress; RWC of Xiaoyan 22 is higher than that of Xiaoyan 6. Xiaoyan 22 was more adaptable to water and nitrogen stress than Xiaoyan 6, and its physiological metabolism was more vigorous than that of Xiaoyan 6. |
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