Genetic improvement in density and nitrogen stress tolerance traits over 38 years of commercial maize hybrid release
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- 作者：Keru Chena ; chen1098@purdue.edu" class="auth_mail" title="E-mail the corresponding author ; James J. Camberatoa ; Mitchell R. Tuinstraa ; Saratha V. Kumudinib ; Matthijs Tollenaarb ; Tony J. Vyna ; tvyn@purdue.edu" class="auth_mail" title="E-mail the corresponding author ;
- 关键词：Genetic improvement ; Kernel number ; Kernel weight ; Source-sink ratio ; Ear growth rate
- 刊名：Field Crops Research
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：196
- 期：Complete
- 页码：438-451
- 全文大小：949 K
文摘
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Grain yield increased 66 kg ha−1 year−1 over a 38-year period (1967–2005) of Dekalb hybrid release.
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Kernel weight (KW) increased 1.29 mg kernel−1 year−1 along with gains in post-silking dry matter.
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Kernel number per plant (at the 3 plant densities evaluated) didn’t increase over the decades of hybrid release.
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Newer hybrids achieved higher KW per ear growth rate (EGR), and KW correlated strongly with (EGR).
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Higher grain yields with newer DeKalb hybrids were more due to source strength than sink strength.