摘要
对14个玉米杂交种发芽期和苗期的耐寒性进行了鉴定,在常温和低温胁迫下分别测定了发芽率、平均发芽时间、苗高、根长、苗干重和根干重,并以各性状的相对值作为耐寒性的评价指标。结果表明,在低温胁迫下,耐寒杂交种的根干重未下降。通过聚类分析,将杂交种分成了耐寒、中等耐寒和低温敏感3大类,郑单958、纪元1号、浚单20耐寒性强,津北288和高优1号耐寒性弱,其余品种属于中等耐寒。相关分析表明,相对苗高、相对苗干重和相对根干重这三个指标可以作为玉米耐寒性筛选的较好指标。
The chilling tolerance of 14 maize hybrids at germination and seedling growth stage were identified under room temperature and low temperature stress conditions. The relative values of each trait including germination rate, mean germination time, the height of shoot, the length of root, dry weight of shoot and root were used as indexes to assess chilling tolerance. The results show that the dry weight of root of maize hybrids with chilling tolerance didn’t decrease. Maize hybrids were clustered into three groups： chilling tolerance, intermediate chilling tolerance and chilling sensitivity. The chilling tolerance varieties included Zhengdan 958, Jiyuan 1 and Jundan 20, while Jinbei 288 and Gaoyou 1 belonged to chilling sensitivity varieties and the rest were ascribed to intermediate chilling tolerance varieties. The correlation analyses show that the relative values of shoot height, dry weight of shoot and root were suitable parameters for evaluating chilling tolerance.
出处
《天津农学院学报》
CAS
2015年第1期15-18,28,共5页
Journal of Tianjin Agricultural University
基金
"十二五"农村领域国家科技计划项目"环渤海天津增粮技术集成与示范"(2013BAD05B08)
天津农学院科技发展基金项目"种子引发对干旱胁迫下玉米芽苗期生理性状的影响"(2013N06)
天津市农业科技成果转化与推广项目"中单系列玉米杂交种栽培示范"(201204070)
关键词
玉米杂交种
芽苗期
耐寒性鉴定
maize hybrid
germination and seedling growth stage
chilling tolerance identification
