摘要
为选育耐盐性生菜品种,以3种不同品种的生菜种子(紫叶生菜、玻璃生菜和结球生菜)为试验材料,研究不同浓度的Na2CO3(0,5,10,20,30,40,50mmol·L^-1)对3种不同生菜品种的发芽势、发芽率、发芽指数、根长、生物量、丙二醛含量以及电导率等的影响。结果表明:在不同浓度的Na2CO3胁迫下,发芽指标和生长指标均呈现出先上升后下降的趋势,同时,幼苗的丙二醛含量及根系电导率呈先下降后上升的趋势。说明低浓度的Na2CO3 (5 mmol·L^-1)对生菜种子的萌发及幼苗的生长有一定的促进作用,当Na2CO3浓度较高(≥10mmol·L^-1)时,则会抑制种子的萌发及生长,并随着Na2CO3浓度的增加,抑制效果越来越明显。采用隶属函数法对各项指标进行综合分析,确定3种生菜的碱性盐抗性强弱依次为:紫叶生菜≈玻璃生菜>结球生菜。
In order to breed salt tolerant lettuce varieties , in this experiment , three different varieties of lettuce seeds ( purple leaf lettuce , glass lettuce , and lettuce ) were used as experimental materials to study the effects of Na 2 CO 3 stress ( 0 , 5 , 10 , 20 , 30 , 40and 50mmol · L^-1 ) on germination potential , germination rate , germination in-dex , root length , biomass , malondialdehyde content and electrical conductivity.The results showed that the ger-mination index and growth index showed a trend of increasing first and then decreasing under different concen-trations of Na 2 CO 3 stress.At the same time , the malondialdehyde content and root conductivity of the seedlings decreased first and then increased.It indicated that low concentration of Na 2 CO 3 ( 5mmol · L^-1 ) could promote the germination and seedling growth of lettuce.When the concentration of Na 2 CO 3 was high (≥10mmol · L^-1 ), it would inhibit the germination and growth of seeds.As the concentration of Na 2 CO 3 increased , the inhibitory effect became more and more obvious.The subordinate function method was used to comprehensively analyze the indicators , and the alkaline salt resistance of the three lettuces was determined as follows : purple leaf let-tuce≈glass lettuce> knotted lettuce.
作者
万发香
张炜
陈伯清
WAN Fa - xiang;ZHANG Wei;CHEN Bo - qing(College of Life Science and Food Engineering,Huaiyin Institute of Technology,Huaian 223003,China)
出处
《黑龙江农业科学》
2019年第9期47-53,共7页
Heilongjiang Agricultural Sciences
基金
淮安市科技项目(HAN2015001)
