龟裂碱土对不同基因型甜高粱幼苗生长和生理特性的影响

为探明甜高粱幼苗对龟裂碱土胁迫的响应,通过盆栽试验,以5个不同基因型的甜高粱为材料,研究了龟裂碱土对甜高粱幼苗生长和生理特性的影响。结果表明,龟裂碱土抑制了甜高粱幼苗的生长,显著降低了甜高粱幼苗株高、根长和植株干重。龟裂碱土胁迫条件下,不同基因型甜高粱叶绿素含量和光合速率均大幅度降低,而叶片质膜相对透性、MDA含量以及SOD、POD、CAT等保护性酶活性则显著升高。不同基因型甜高粱对龟裂碱土胁迫的耐受能力存在较大差异,品种ZNH05耐盐碱能力较差,ZNH07和ZNH18则表现出较强的耐盐碱性。

Seedling growth and physiological characteristics of different sweet sorghum genotypes in Takyric Solonetz soils

To explore the response of sweet sorghum seedlings to stress when grown on Takyric Solonetz soils, growth and physiological characteristics of five different sweet sorghum genotypes were studied in a pot trial. Takyric Solonetz inhibited seedling growth of sweet sorghum, and significantly reduced plant height, root length and plant dry weight of sweet sorghum seedlings. The chlorophyll content and photosynthetic rate of different sweet sorghum genotypes were greatly reduced, while the plasma membrane relative permeability, MDA levels and SOD, POD, and CAT activities were significantly increased under stress conditions induced by Takyric Solonetz. There were significant differences in salt or alkalinity tolerance among 5 genotypes of sweet sorghum. Variety ZNH05 showed least tolerance to Takyric Solonetz stress, while ZNH07 and ZNH18 showed stronger resistance to Takyric Solonetz stress.