作物学报 ›› 2015, Vol. 41 ›› Issue (07): 1112-1120.doi: 10.3724/SP.J.1006.2015.01112
牛平平1,穆心愿1,张星1,杨春收2,李潮海1,*
NIU Ping-Ping1,MU Xin-Yuan1,ZHANG Xing1,YANG Chun-Shou2,LI Chao-Hai1,*
摘要:
以1973年以来5个主推玉米品种中单2号、丹玉13、掖单13、农大108和郑单958以及新品种豫单606为材料,在低氮和低氮干旱复合胁迫下,研究了品种更替过程中根系变化特征。结果表明,随年代推进,玉米品种根干重、根长及根表面积呈先升后降又升的趋势,早期品种的3个根系性状逐渐增加,以获取更多的水分和养分,现代品种的3个根系性状逐渐减少,以减少冗余器官的消耗,而新品种有所上升,以满足产量持续增长所需水分和养分。在低氮和低氮干旱复合胁迫下,与早期品种相比,现代品种根干重变化小,但根长和根表面积增加多,根系平均直径变细,伤流量减少不显著。上述结果表明,不同年代玉米品种根系逐渐优化,现代品种根系形态调节能力增强,对低氮和低氮干旱复合胁迫的耐性提高。
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