Application of moderate nitrogen levels alleviates yield loss and grain quality deterioration caused by post-silking heat stress in fresh waxy maize
Application of moderate nitrogen levels alleviates yield loss and grain quality deterioration caused by post-silking heat stress in fresh waxy maize
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施用适量施氮可缓解鲜糯玉米吐丝后热应激造成的产量损失和籽粒品质恶化
DOI：
10.1016/j.cj.2019.11.007
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发表时间：
2020-03
期刊：
影响因子：
6.6
通讯作者：
Lu Dalei
中科院分区：
文献类型：
--
作者：
Wang Jue;Fu Pengxiao;Lu Weiping;Lu Dalei
High temperature (HT) during grain filling is one of the most important environmental factors limiting maize yield and grain quality. Nitrogen (N) fertilizer is essential for maintaining normal plant growth and defense against environmental stresses. The effects of three N rates and two temperature regimes on the grain yield and quality of fresh waxy maize were studied using the hybrids Suyunuo 5 (SYN5) and Yunuo 7 (YN7) as materials. N application rates were 1.5, 4.5, and 7.5 g plant−1, representing low, moderate, and high N levels (LN, MN, and HN, respectively). Mean day/night temperatures during the grain filling of spring- and summer-sown plants were 27.6/21.0 °C and 28.6/20.0 °C for ambient temperature (AT) and 35/21.0 °C and 35/20.0 °C for HT, respectively. On average, HT reduced kernel number, weight, yield, and moisture content by 29.8%, 17.9%, 38.7%, and 3.3%, respectively. Kernel number, weight, yield, moisture, and starch contents were highest under MN among the three N rates under both temperature regimes. HT reduced grain starch content at all N levels. HT increased grain protein content, which gradually increased with N rate. Mean starch granule size under MN was larger (10.9 μm) than that under LN and HN (both 10.4 μm) at AT. However, the mean size of starch granules was higher under LN (11.7 μm) and lower under MN (11.2 μm) at HT. Iodine binding capacity (IBC) was lowest under MN and highest under HN among the three N levels under both temperature regimes. In general, IBC at all N rates was increased by HT. Peak viscosity (PV) was gradually reduced with increasing N rate at AT. In comparison with LN, PV was increased by MN and decreased by HN at HT. Retrogradation percentage gradually increased with N rate at AT, but was lowest under MN among the three N rates at HT. LN + AT and MN + HT produced grain with high pasting viscosity and low retrogradation tendency. MN application could alleviate the negative effects of HT on the grain yield and quality of fresh waxy maize.
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影响因子：
5.8
作者：
Ordonez, Raziel A.;Savin, Roxana;Slafer, Gustavo A.
通讯作者：
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影响因子：
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作者：
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作者：
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DOI：
10.3724/sp.j.1006.2013.00557
发表时间：
2013
期刊：
Acta Agronomica Sinica
影响因子：
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作者：
Dalei Lu;Xuli Sun;Xin Wang;Fabao Yan;W. Lu
通讯作者：
Dalei Lu;Xuli Sun;Xin Wang;Fabao Yan;W. Lu