Synergistic effects of planting density and nitrogen fertilization on chlorophyll degradation and leaf senescence after silking in maize

文献类型： 外文期刊

第一作者： Lan, Tianqiong

作者： Lan, Tianqiong;Wang, Xinglong;Feng, Dongju;Kong, Fanlei;Yuan, Jichao;Du, Lunjing;Lan, Tianqiong;Du, Lunjing;Wang, Xinglong;Zhan, Xiaoxu;Liu, Qinlin;Wei, Gui;Lyu, Chengcheng;Liu, Fan;Gao, Jiaxu;Feng, Dongju;Kong, Fanlei;Yuan, Jichao

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关键词： Density; Nitrogen fertilization; Leaf senescence; Chlorophyll-degrading enzyme; Logistic model

期刊名称：CROP JOURNAL （ 影响因子：6.0； 五年影响因子：5.6 ）

ISSN： 2095-5421

年卷期： 2024 年 12 卷 2 期

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收录情况： SCI

摘要： Regulating planting density and nitrogen (N) fertilization could delay chlorophyll (Chl) degradation and leaf senescence in maize cultivars. This study measured changes in ear leaf green area (GLA ear ), Chl content, the activities of Chl a -degrading enzymes after silking, and the post-silking dry matter accumulation and grain yield under multiple planting densities and N fertilization rates. The dynamic change of GLA ear after silking fitted to the logistic model, and the GLA ear duration and the GLA ear at 42 d after silking were affected mainly by the duration of the initial senescence period ( T 1 ) which was a key factor of the leaf senescence. The average chlorophyllase (CLH) activity was 8.3 times higher than pheophytinase activity and contributed most to the Chl content, indicating that CLH is a key enzyme for degrading Chl a in maize. Increasing density increased the CLH activity and decreased the Chl content, T 1 , GLA ear , and GLA ear duration. Under high density, appropriate N application reduced CLH activity, increased Chl content, prolonged T 1 , alleviated high -density -induced leaf senescence, and increased post-silking dry matter accumulation and grain yield. (c) 2024 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY -NCND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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