• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Journal of Experimental Botany >Soil water capture trends over 50 years of single-cross maize (Zea mays L.) breeding in the US corn-belt
【2h】

Soil water capture trends over 50 years of single-cross maize (Zea mays L.) breeding in the US corn-belt

机译：美国玉米地带单杂交玉米（Zea mays L.）繁殖50年的土壤水捕获趋势

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Breeders have successfully improved maize (Zea mays L.) grain yield for the conditions of the US corn-belt over the past 80 years, with the past 50 years utilizing single-cross hybrids. Long-term improvement for grain yield under water-limited conditions has also been reported. Grain yield under water-limited conditions depends on water use, water use efficiency, and harvest index. It has been hypothesized that long-term genetic gain for yield could be due, in part, to increased water capture from the soil. This hypothesis was tested using a set of elite single-cross hybrids that were released by DuPont Pioneer between 1963 and 2009. Eighteen hybrids were grown in the field during 2010 and 2011 growing seasons at Woodland, CA, USA. Crops grew predominantly on stored soil water and drought stress increased as the season progressed. Soil water content was measured to 300cm depth throughout the growing season. Significant water extraction occurred to a depth of 240–300cm and seasonal water use was calculated from the change in soil water over this rooting zone. Grain yield increased significantly with year of commercialization, but no such trend was observed for total water extraction. Therefore, the measured genetic gain for yield for the period represented by this set of hybrids must be related to either increased efficiency of water use or increased carbon partitioning to the grain, rather than increased soil water uptake.
机译：在过去的80年中，育种者已经成功提高了美国玉米带条件下的玉米（Zea mays L.）谷物产量，在过去的50年中，利用单杂交种。也有报道说在缺水条件下可以长期改善谷物产量。缺水条件下的谷物产量取决于用水量，用水效率和收获指数。据推测，长期的遗传增产可能部分归因于从土壤中捕获的水分增加。使用一组由杜邦先锋（DuPont Pioneer）在1963年至2009年之间发布的精英单杂交种进行了检验。在2010年至2011年的生长季节，在美国加利福尼亚州伍德兰市共种植了18种杂种。随着季节的进行，作物主要在储存的土壤水上生长，干旱压力增加。在整个生长季节中，测量土壤水含量至300cm深度。深度为240-300cm的地方发生了严重的水提取，并且根据该生根区域土壤水的变化计算了季节性用水量。随着商品化年份的增加，谷物产量显着增加，但总水提取量未观察到这种趋势。因此，在这套杂种所代表的时期内，测得的单产的遗传增益必须与水分利用效率的提高或碳对谷物的分配增加有关，而不是与土壤水分吸收有关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号