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首页> 外文学位 >Did recurrent selection for yield affect Iowa stiff stalk synthetic maize population grain fill characteristics.
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Did recurrent selection for yield affect Iowa stiff stalk synthetic maize population grain fill characteristics.

机译：经常性的产量选择是否影响了爱荷华州硬秆合成玉米种群的籽粒灌浆特性。

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摘要

Hybrid maize yield increases, new product development, and increased stress tolerance can be more easily achieved with a better understanding of the physiological and genetic basis for phenotypic changes in response to recurrent selection for yield. The purpose of this study was to identify changes in grain fill characteristics and their interaction with plant density in a closed population and identify a model that accurately predicts grain fill in this population. We hypothesize that recurrent selection for increased yield indirectly impacted the grain fill characteristics of maize including final kernel weight, kernel fill duration, and kernel fill rate in the Iowa Stiff Stalk Synthetic maize population. We also hypothesize that recurrent selection for yield has indirectly improved maize tolerance to high plant density stress for these grain fill characteristics.;Populations representing different levels of advancement from the Iowa Stiff Stalk Synthetic maize population were compared to at two different locations near Ames, Iowa in 2009 and 2010. Populations were compared at plant densities of 5.3 and 7.7 seeds m-2. Treatments were replicated three times per location in a split plot design. Recurrent selection for yield has led to changes in final kernel weight and kernel fill duration, as well as the response of kernel weight to increased planting densities. This supports our hypothesis that recurrent selection for yield changed grain fill characteristics and the effect of high plant density stress in the Iowa Stiff Stalk Synthetic maize population. The rate of kernel fill was not affected by recurrent selection for yield in the Iowa Stiff Stalk Synthetic maize population.
机译：通过更好地了解表型变化的生理和遗传基础，应对杂交选择产量，可以更轻松地实现杂交玉米产量的增加，新产品的开发以及更高的胁迫耐受性。这项研究的目的是确定封闭种群中籽粒灌浆特性的变化及其与植物密度的相互作用，并确定能够准确预测该种群中谷物填充的模型。我们假设提高爱荷华硬质秸秆人工合成玉米种群的轮作选择以增加产量间接影响了玉米的籽粒填充特性，包括最终粒重，籽粒填充持续时间和籽粒填充率。我们还假设，针对这些籽粒填充特征，轮作选择的产量已经间接提高了玉米对高植物密度胁迫的耐受性。将与爱荷华州硬秸秆人工合成玉米种群不同生长水平的种群与爱荷华州埃姆斯附近的两个不同地点进行了比较在2009年和2010年。比较了种群密度分别为5.3和7.7种子m-2的种群。在分割地块设计中，每个位置重复处理3次。反复选择产量已导致最终籽粒重量和籽粒填充持续时间的变化，以及籽粒重量对增加种植密度的响应。这支持了我们的假设，即反复选择产量以改变谷物的灌浆特性，以及在爱荷华州硬秸秆人工合成玉米群体中高植物密度胁迫的影响。爱荷华州硬秸秆人工合成玉米群体中反复选择产量的籽粒填充率不受影响。

著录项

  • 作者

    Eichenberger, Steven James.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Agriculture Agronomy.;Agriculture Plant Culture.
  • 学位 M.S.
  • 年度 2011
  • 页码 61 p.
  • 总页数 61
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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