Shoot and root traits in drought tolerant maize(Zea mays L.) hybrids

作     者：ZHAO Jin XUE Qing-wu Kirk E Jessup HOU Xiao-bo HAO Bao-zhen Thomas H Marek XU Wen-wei Steven R Evett Susan A O'Shaughnessy David K Brauer 

作者机构：Texas A&M AgriLife Research and Extension Center at Amarillo TX 79106 USA Department of Soil Water and Environmental Sciences University of Arizona AZ 85721 USA School of Science and Technology Xinxiang University Xinxiang 453003 P.R.China Texas A&M AgriLife Research and Extension Center at Lubbock TX 79403 USA USDA-ARS Conservation and Production Research Laboratory TX 79012 USA 

出 版 物：《Journal of Integrative Agriculture》 (农业科学学报（英文版）)

年 卷 期：2018年第17卷第5期

页      面：1093-1105页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 09[农学] 071007[理学-遗传学] 0901[农学-作物学] 

基　　金：supported in part by the UDSA-Ogallala Aquifer Program Texas A&M Agri Life Research Cropping System Program, USA the USDA National Institute of Food and Agriculture Hatch Project, USA (TEX09438) 

主　　题：drought tolerant hybrid rooting characteristics water use water use efficiency 

摘      要：This study aimed to investigate the differences in shoot and root traits, and water use and water use efficiency（WUE） in drought tolerant（DT） maize（Zea mays L.） hybrids under full and deficit irrigated conditions. A two-year greenhouse study was conducted with four hybrids（one conventional hybrid, 33D53AM, two commercial DT hybrids, P1151 AM, N75H, and an experimental hybrid, Exp HB） grown under two water regimes（I（100） and I（50）, referring to 100 and 50% of evapotranspiration requirements）. Under water stress, the hybids P1151 AM, N75, and Exp HB showed more drought tolerance and had either greater shoot dry weight or less dry weight reduction than the conventional hybrid（33 D53 AM）. However, these three hybrids responded to water stress using different mechanisms. Compared with the conventional hybrid, the two commercial DT hybrids（P1151 AM and N75H） had a smaller leaf area, shoot dry weight, and root system per plant. As a result, these hybrids used less water but had a higher WUE compared with the conventional hybrid. In contrast, the experimental hybrid（ExpHB） produced more shoot biomass by silking stage at both irrigation levels than all other hybrids, but it had relatively lower WUE. The hybrids demonstrated different drought response mechanisms that may require different irrigation management strategies. More investigation and validation are needed under field conditions and in different soil types.