干旱胁迫下3个甜角品种幼苗的生理生化响应及抗旱性评价

Physiological and Biochemical Response to Drought Stress in Seedling Stages and Drought-Resistance Evaluation of Sweet Tamarind Varieties

在大棚模拟持续干旱条件下,测定了3个甜角品种PRAKAYTONG(闪金)、SRITONG(金色)、SRITONGBAO(轻金色)幼苗叶片的细胞质膜透性、丙二醛(MDA)含量、渗透调节物质含量、保护酶活性、叶片含水量和叶绿素含量,研究甜角对干旱胁迫的生理生化响应,并用抗旱系数法和隶属函数法进行抗旱性综合评价。结果表明:随着干旱胁迫时间的延长及胁迫程度的加重,幼苗叶片的细胞质膜透性、MDA含量、脯氨酸含量、可溶性糖和可溶性蛋白含量都呈增加趋势;SOD和POD活性则呈先上升后下降趋势;叶片水分含量和叶绿素呈减少趋势。经抗旱指数法和隶属函数法分析,3个品种的抗旱性从强到弱依次表现为PRAKAYTONG>SRITONGBAO>SRITONG。

The physiological and biochemical indexes such as protoplasmic membrane penetrability（PMP）,malondialdehyde（MDA） content,osmoticum content,activities of protective enzymes,leaf relative water content（LRWC） and chlorophyll content（CHLC） in leaves of three Sweet Tamarind varieties of PRAKAYTONG,SRITONG,and SRITONGBAO were measured under constantly drought stress,and then the drought resistance was evaluated by drought-resistant coefficients and subordinate function.The result showed that with the development of constantly drought stress,the PMP,MDA content,proline content,soluble sugar content and soluble protein content were increased,the activities of superoxide dismutase and peroxidase increased in the beginning and decreased at last,and the LRWC and CHLC decreased in leaves of the three kinds of Sweet Tamarind.The comprehensive evaluation result by drought-resistant coefficients and subordinate function methods showed that the order of drought resistance was PRAKAYTONG SRITONGBAO SRITONG.