Mixing trait-based corn(Zea mays L.)cultivars increases yield through pollination synchronization and increased cross-fertilization  

作　　者：Hongping Li Kui Liu Zhibin Li Moubiao Zhang Yongen Zhang Shuyan Li Xiuling Wang Jinlong Zhou Yali Zhao Tianxue Liu Chaohai Li 

机构地区：[1]Agronomy College,Henan Agricultural University,Collaborative Innovation Center of Henan Grain Crops/Co-construction State Key Laboratory of Wheat and Maize Crop Science,Zhengzhou 450046,Henan,China [2]Swift Current Research and Development Centre,Swift Current,Saskatchewan S9H 3X2,Canada [3]Agricultural Information Institute,Chinese Academy of Agricultural Science,Beijing 100081,China [4]Henan Institute of Meteorological Sciences/CMA
Henan Key Laboratory of Agrometeorological Support and Applied Technique,Zhengzhou 450046,Henan,China

出　　处：《The Crop Journal》2023年第1期291-300,共10页作物学报（英文版）

基　　金：supported by National Natural Science Foundation of China(31801308);Henan Provincial Higher Education Key Research Project(21A210024);CMA·Henan Key Laboratory of Agrometeorological Support and Applied Technique(AMF202109)。

摘　　要：Abiotic stress such as high temperature at flowering is one of many conditions reducing yield of corn(Zea mays L.).Mixing corn cultivars with diverse functional traits increases within-crop diversity and provides a potential means of mitigating yield losses under stress conditions.We conducted a three-year field study to investigate the effects of cultivar mixtures on kernel setting rate,pollen sources,and yield.This study consisted of six treatments,including two high temperature-tolerant(HTT)monocrops of WK702 and DH701,two high temperature-sensitive(HTS)monocrops of DH605 and DH662,and two HTT–HTS mixtures of WK702-DH605 and DH701-DH662.The anthesis–silking interval(ASI)was 0.9–1.6 days shorter in mixtures than in monocrops.Kernel setting rate was increased in mixtures(86.4%–88.7%)compared with those in monocrops(74.7%–84.1%)as a result of synchrony and complementarity of pollination.Grain yields of the HTT–HTS mixtures increased by 13.3%–18.7%,equivalent to 1169 to1605 kg ha^(-1),in comparison with HTS corn monocrops.The results of SSR markers showed that crossfertilization percentage in corn cultivar mixtures ranged from 29.3%to 47.8%,partially explaining yield improvement.Land equivalent ratio(LER)was 1.12 for corn mixtures and the partial land equivalent ratio(e.g.,>0.5)showed the complementary benefits in corn mixtures.The results indicated that mixing corn cultivars with diverse flowering and drought-tolerance traits increased yields via pollination synchrony.

关 键 词：Cultivar heterogeneity Cultivar mixture Flowering trait synchronization Fertilization complementarity Kernel set 

分 类 号：S513[农业科学—作物学]