摘要
试验对玉米9个自交系发芽和苗期的耐寒性进行了鉴定,在常温(25℃)和低温(11℃)胁迫下分别测定了种子发芽特性及幼苗素质的各项指标.以各性状低温与常温下测定值的比值(相对值)作为耐寒性评价指标.结果表明,在低温逆境下,苗比根对低温更敏感,耐寒自交系的根和幼苗总干重未下降.通过聚类分析,解决了由于性状相对值差异微小而难以评价自交系耐寒性的问题,将自交系分成了耐寒、中等耐寒和低温敏感3类.相关性分析表明,相对发芽率、相对幼苗总干重、相对地上部苗干重、相对根干重之间显著相关,是较好的耐寒性评价指标.
The chilling tolerance of nine maize inbred lines at germination and seedling growth stages were investigated by determining traits of germination characteristics and seedling quality at normal temperature （25℃） and low temperature （11℃ ） stress. The ratios （relative values） of trait values at low temperature to those at normal temperature were used to assess chilling tolerance. The results showed that the shoot of maize was more sensitive than root to low temperature, dry weight of root and seedling in chilling tolerance lines were not reduced by low temperature stress. The cluster analysis was used to solve assessing difficult of chilling tolerance due to small differences among relative values in maize inbred lines. Maize inbred lines were clustered into three groups： chilling tolerance, intermediate chilling tolerance and chilling sensitivity. The correlation analysis showed that the relative values of germination percentage, dry weight of seedling, shoot and root were significantly correlated with each other; they were suitable parameters for evaluating chilling tolerance.
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2006年第1期41-45,共5页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家自然科学基金资助项目(30370911)
关键词
玉米自交系
耐寒性鏊定
聚类分析
相关性分析
maize inbred lines
chilling tolerance identification
cluster analysis
correlation analysis
