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Evidence of arrested silk growth in maize at high planting density using phenotypic and transcriptional analyses

Journal of Integrative Agriculture 2022年第11期21卷 3148-3157页

作者： ZHANG Min XING Li-juan REN Xiao-tian ZOU Jun-jie SONG Fu-peng WANG Lei XU Miao-yun Biotechnology Research Institute CAAS/Key Laboratory of Agricultural Genomics(Beijing)Ministry of AgricultureBeijing 100081P.R.China College of Bioscience and Resources of Environment Beijing University of AgricultureBeijing 102206P.R.China National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resource College of Resources and EnvironmentShandong Agricultural UniversityTai′an 271018P.R.China

Increasing the planting density is an effective way to increase the yield of maize(Zea mays L.),although it can also aggravate ovary apical abortion-induced bald tips of the ears,which might,in turn,reduce the *** the mechanism underlying the regulation of drought-related abortion in maize is well established,high planting density-related abortion in maize remains poorly ***,the present study was designed to investigate the mechanism underlying the ovary apical abortion response to high *** was achieved by evaluating the effects of four different plant densities(60000 plants ha^(–1)(60 k),90 k,120 k,and 150 k)on plant traits related to plant architecture,the plant ear,flowering time,and silk development in two inbred lines(Zheng58 and PH4CV)and two hybrid lines(Zhengdan958 and Xianyu335).The phenotypes of both inbred and hybrid plants were observed under different planting density treatments,and the high planting density was found to increase the phenotypic performance values of the evaluated *** anthesis–silking interval(ASI)was extended,and the amount of the silk extruded from husks was reduced upon increasing the planting *** silk emergence resulted in asynchronous flowering and ear bald *** of the silk cells revealed that the silk cells became smaller as planting density *** changes in transcript abundances in the silks involved the genes associated with expansive growth rather than carbon *** findings further our understanding of silk growth regulation under high planting density and provide a theoretical basis for further research on improving high planting density breeding in maize.

关键词： maize(Zea mays L.) high planting density bald tip ASI silk expansive growth

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