Historical increases of maize leaf area index in the US Corn Belt due primarily to plant density increases

IF 5.6 1区 农林科学 Q1 AGRONOMY
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Abstract

Context

Leaf area index (LAI) and leaf area distribution within the maize plant are important traits used to explain and predict light interception and thus crop productivity.

Objectives

Here we investigate breeding and plant density effects of leaf area traits. Our objectives are to 1) quantify maize breeding impacts on leaf area distribution and determine bell-shape coefficients used in crop modeling, 2) dissect the contribution of breeding from plant density, and 3) explore the relationship between LAI and crop yields.

Methods

We studied 18 hybrids released between 1983 and 2017 at two density treatments: current (8.5 pl m−2) and historical increasing density (from 4.6 to 8.5 pl m−2) in Iowa, USA.

Results

Results indicated that concurrent changes in hybrids and increases in plant density have increased LAI from 3.4 (in 1983) to 5.9 m2 m−2 (in 2017), with the highest LAI increases (>50 %) to be realized in the middle canopy. At historical increasing in plant density treatment, the LAI increased by 1.6 % year−1, but the individual plant leaf area decreased by 0.33 % year−1 from 1983 to 2017. This trade-off indicates that new hybrids are more tolerant to higher plant populations than old hybrids. At current plant density treatment, the year of hybrid release did not affect LAI or individual plant leaf area. New hybrids had 5 % narrower leaf area distributions, 23 % higher optimum LAI values (5.2 vs 4.2 m2 m−2) and 19 % higher grain yields compared to old hybrids.

Conclusions

The main reason for the increase in maize LAI in the US Corn Belt is plant density. However, an increase in LAI does not necessarily translate to higher grain yields as new hybrids had significantly higher grain yields than older hybrids at similar LAI values. Present results contribute to our understanding of maize canopy architecture and allow us to better calibrate crop models to accurately estimate LAI and grain yield.
美国玉米带玉米叶面积指数的历史性增长主要归因于植株密度的增加
背景叶面积指数(LAI)和玉米植株内的叶面积分布是重要的性状,用于解释和预测光的截获,进而解释和预测作物产量。我们的目标是:1)量化玉米育种对叶面积分布的影响并确定用于作物建模的钟形系数;2)从植株密度中分析育种的贡献;以及 3)探索 LAI 与作物产量之间的关系。方法我们研究了 1983 年至 2017 年间在两种密度处理下释放的 18 个杂交种:当前密度(8.结果结果表明,杂交种的同时变化和植物密度的增加使 LAI 从 3.4(1983 年)增加到 5.9 m2 m-2(2017 年),其中冠层中部的 LAI 增加最高(50%)。在植株密度不断增加的历史处理中,从1983年到2017年,LAI每年增加1.6%-1,但单株叶面积每年减少0.33%-1。这种权衡表明,新杂交种比老杂交种更能承受较高的植株数量。在当前的植物密度处理下,杂交种的发布年份并不影响 LAI 或单株叶面积。与老杂交种相比,新杂交种的叶面积分布窄 5%,最适 LAI 值高 23%(5.2 对 4.2 m2 m-2),谷物产量高 19%。然而,LAI 的增加并不一定意味着谷物产量的提高,因为在相似的 LAI 值下,新杂交种的谷物产量明显高于老杂交种。目前的研究结果有助于我们了解玉米冠层结构,使我们能够更好地校准作物模型,以准确估计LAI和谷物产量。
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来源期刊
Field Crops Research
Field Crops Research 农林科学-农艺学
CiteScore
9.60
自引率
12.10%
发文量
307
审稿时长
46 days
期刊介绍: Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.
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