• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Genetic analysis of maize growth and flowering response to phosphorus deficiency, and the evaluation of six mycorrhizal isolates for their ability to promote growth of maize genotypes under phosphorus deficiency.
【24h】

Genetic analysis of maize growth and flowering response to phosphorus deficiency, and the evaluation of six mycorrhizal isolates for their ability to promote growth of maize genotypes under phosphorus deficiency.

机译：玉米生长和开花对缺磷反应的遗传分析，以及对六个菌根分离株在缺磷条件下促进玉米基因型生长的能力的评估。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Optimization of P use efficiency in maize hybrid production is important to improve interactions between agricultural production systems and the environment, to improve the stability of world food supplies, and to optimize resource utilization in areas of intensive farming. Enhancing genetic characteristics of maize hybrids and manipulating mycorrhizal populations in association with maize can be beneficial in improving P use efficiency. The objectives of this dissertation were to (1) compare the B73 X Mo17 RIL shoot weight response to added P in the field with the response previously measured in the glasshouse, (2) characterize the genetic effect of low P on phenotypic expression of seedling emergence, flowering date, and plant height, and (3) to determine the relative growth benefit of six mycorrhizal isolates on maize inbreds grown under P deficiency. Phenotypic and rank correlations between shoot weight response to added P in the field and glasshouse experiments were not significant and near zero, proving that measurements made in the glasshouse are not predictive of field performance for this trait. Phenotypic correlations between growing degree days to anthesis and shoot weights under high and low P were significant and negative. A QTL was detected for growing degree days to flower with a greater allelic effect under low P than high P. This region has previously been identified for shoot weight response to added P and for flowering time in other populations, suggesting that a relationship between nutrient efficiency and flowering may exist with earlier flowering genotypes being more P efficient than later genotypes. While significant maize genotype by mycorrhizal interactions were found, the effect of mycorrhizal isolate was greater than the maize genotype effect. Mycorrhizal isolates in the Glomus genus provided the greatest benefit to shoot weight under low P and have the greatest potential for use under a wide range of maize inbreds. Our results indicate that a combination of cultivar development and management of mycorrhizal populations by inoculation or crop rotation will contribute to optimal maize productivity in reduced input systems.
机译：玉米杂交生产中磷素利用效率的优化对于改善农业生产体系与环境之间的相互作用，改善世界粮食供应的稳定性以及优化集约化农业地区的资源利用具有重要意义。增强玉米杂种的遗传特性，并与玉米结合使用菌根种群，可有助于提高磷的利用效率。本文的目的是（1）将B73 X Mo17 RIL苗重对田间添加P的响应与以前在温室中测得的响应进行比较;（2）表征低P对幼苗出苗表型表达的遗传效应，开花日期和株高，以及（3）确定六种菌根分离株对缺磷条件下玉米自交系的相对生长益处。田间试验和温室试验对添加的磷的苗重响应之间的表型和等级相关性不显着且接近零，证明在温室中进行的测量不能预测该性状的田间表现。在高磷和低磷条件下，开花期到花期的天数与苗重之间的表型相关性是显着的和负相关。在低磷条件下，检测出一个QTL的花期可以提高开花的等位基因效应，而在高磷条件下，该QTL具有更高的等位基因效应。该区域先前已被确定为芽苗对添加磷的重量响应和其他种群的开花时间，这表明养分效率之间存在相关性。可能存在开花，早期开花的基因型比后期的基因型更有效率。虽然通过菌根相互作用发现了显着的玉米基因型，但菌根分离株的作用大于玉米基因型作用。 Glomus 属的菌根分离株在低磷条件下对增重具有最大的益处，在广泛的玉米自交系中具有最大的应用潜力。我们的结果表明，通过接种或作物轮作，品种开发和菌根种群管理相结合，将有助于减少输入系统中的最佳玉米生产力。

著录项

  • 作者

    Mickelson, Suzanne Michelle.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Agriculture Agronomy.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 127 p.
  • 总页数 127
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农学（农艺学）;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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