四种草地早熟禾抗盐碱生理生化特性的研究

对北方草坪建植中常用的4个草地早熟禾(PoaPratensis)品种进行了萌发期及苗期耐盐碱能力的比较研究。结果表明:低浓度混合盐碱处理对草地早熟禾的萌发和生长起到促进作用;随混合盐碱浓度的升高草地早熟禾的发芽率和生长受到明显的抑制,且对胚根生长的抑制作用强于胚芽;对幼苗进行混合盐碱胁迫发现,低浓度盐碱胁迫使SOD、CAT和POD的活性以及游离脯氨酸含量均升高,且在中等浓度下达到最高值,高浓度处理则开始下降;随着盐碱处理浓度的增大,MDA的含量也在缓慢增加。综合分析表明,四个草地早熟禾品种耐盐碱能力依次为:午夜>巴林>巴润>优异。

The Study of Complex Alkali-Saline Stress on four varieties of Poa Pratensis

In this paper the effects of complex alkali-saline stress on 4 varieties of cool season Poa Pratensis were compared during the seeds germination and seedling stage.The findings are as follows: lower concentration of complex alkali-saline promote germination and growth of Poa Pratensis;However germination percentage and growth of Poa Pratensis were restrained prominently with increasing of complex alkali-saline contents And the stress was stronger for growth of radical than that of plumule with increasing of complex alkali-saline concentrations.The results of complex alkali-saline stress on 4 varieties during seedling stage showed that the enzyme activities of SOD?CAT and POD,free proline content increased under lower concentrations of complex alkali-saline, and reached the peak under medium concentration, then decreased under serious stress. In addition, MDA content increased gradually with the increase of complex alkali-saline concentrations.By analyzing comprehensively these physiological indexes, the result indicated that the order of the alkali-saline tolerance of seeds of 4 varieties was ''Midnight'' > ''Bulin'' >''Baron'' >''Merit''.