农业科学研究2026，Vol.47Issue(1)：90-96,7.DOI:10.13907/j.cnki.nykxyj.2026.01.011
遮光对玉米品种株型及光合速率的影响
Effects of shading on plant morphological characteristics and photosynthetic rate of maize cultivars
摘要
Abstract
In order to clarify differences in plant morphological characteristics and photosynthetic responses to shading among high-yielding maize cultivars from different release eras,it compared Yedan 13 and Denghai 618 in a field experiment with two light regimes:30%shading throughout the entire growth period(S)and no shading(CK),under a uniform plant density of 75,000 plants/hm2.The results showed that after shading,Denghai 18 outperformed Yedan 13 in grain yield,dry matter at maturity,post-silking dry matter accumulation,and harvest index.The yield reduction was greater in Yedan 13(49.25%)than in Denghai 618(42.23%).In contrast,the reductions in dry matter at maturity(21.88%vs 34.30%),post-silking dry matter accumulation(34.10%vs 45.59%),and harvest index(7.99%vs 10.50%)were smaller in Yedan 13 than in Denghai 618.Under the control treatment,plant height,ear height,ear height ratio,and aboveground stem internode length were all greater in Yedan 13 than in Denghai 618.Shading increased plant height,ear height,ear height ration,and inernode length in both cultivars.The pattern of internode elongation differed between cultivars:elongation was more pronounced at and above the ear in Yedan 13,whereas it was concentrated in the middle internodes in Denghai 618.Under the control,Yedan 13 had higher leaf area index(LAI),total leaf area,and leaf area density(LAD)both above and below the ear,but a lower net photosynthetic rate(Pn),compared with Denghai 618.Shading increased leaf length and LAI in both cultivars,while significantly decreasing total LAD,above-ear LAD,and leaf Pn.Overall,season-ong low light markedly altered maize plant architecture and reduced grain yield.Denghai 618 exhibited a more suitable LAI and canopy leaf area distribution(LAD),and stronger adaptability under low-light conditions.关键词
玉米/遮光/品种/植株形态/光合速率Key words
maize/shading/cultivar/plant morphology/photosynthetic rate分类
农业科技引用本文复制引用
王苗,杨阳,孙颖,马小成,郭晓霞,刘广周,杨云山,刘万茂,侯鹏..遮光对玉米品种株型及光合速率的影响[J].农业科学研究,2026,47(1):90-96,7.基金项目
宁夏重点研发项目(引才专项)(2022BSB03065) （引才专项）
国家自然科学基金面上项目(32172118) （32172118）
