摘要
以萝卜幼苗为材料,研究了0.15 mol/L NaCl胁迫处理不同时间其根系的生长速度、活力、过氧化物酶(POD)活性和相对电导率的变化,并观察了根尖细胞核形态的变化。结果表明,随着NaCl胁迫时间的延长,萝卜幼苗根系生长速度减慢,根系活力降低,胁迫时间超过48 h时,二者均迅速下降,表现得更为明显;萝卜幼苗根系POD活性和相对电导率则不断增大,胁迫48 h时达到最大,之后POD活性迅速降低,相对电导率随之降低;根尖细胞核由原来规则的圆形转变为各种不规则形状,出现不同程度的凋亡特征。
Using Raphanus sativus L. seedlings as material, root growth rate, root activity, POD activity and relative conductivity in roots were tested under 0.15 mol/L NaC1 stress for different time, and nuclear morphological alteration of apical cells was also observed. The results showed that root growth rate and root activity of Raphanus sativus L. seedlings declined with the extension of NaCl stress, and they both declined rapidly when stress time was over 48 h. In contrast, POD activity and relative conductivity in roots increased constantly to the max during the NaCl stress by 12 h to 24 h, and then both declined when stress time was extended. Nuclear morphology in apical ceils varied from circle to irregular shapes, and the characteristics of apoptosis appeared in different degrees.
出处
《干旱地区农业研究》
CSCD
北大核心
2012年第6期124-127,共4页
Agricultural Research in the Arid Areas
基金
福建省教委资助项目(JB10016)
关键词
萝卜
NACL胁迫
生理指标
根尖细胞
核形态
Raphanus sativus L.
salt stress
physiological characteristics
apical cell
nuclear morphology
