三种冬青属树种的耐涝性和耐旱性评价

通过致死性干旱和致死性水涝处理,用生理生态方法,对冬青(Ilexchinensis)、绿冬青(I.viridis)和无刺枸骨(I.cornatavar.fortunei)进行抗逆性研究。耐涝性结果表明随淹水时间延长,3种受淹冬青体内的游离脯氨酸和丙二醛含量增加,净光合速率下降;比较而言,绿冬青上述受淹反应出现早,无刺枸骨出现迟,而冬青介于二者之间;绿冬青耐涝约1周,无刺枸骨耐涝2周以上,冬青耐涝介于二者之间,在江南水乡推广利用,耐涝方面不会成为限制因素。耐旱结果表明随干旱的逐渐加重,3种冬青体内的游离脯氨酸含量呈上升趋势,比较而言,绿冬青上升的峰值出现早,冬青和无刺枸骨的上升峰值出现迟;绿冬青耐旱约15d,无刺枸骨耐旱约25d,冬青介于二者之间。3种冬青均有一定的抗逆性,其中无刺枸骨对水胁迫的适应能力最强,冬青次之,而绿冬青相对较弱。

Evaluation of waterlogging and drought tolerance of three Ilex species

This paper studied the eco-physiological responses of three Ilex species to waterlogging- and drought stress. Waterlogging tolerance experiment showed that the contents of proline and MDA in test species increased, while net photosynthetic rate decreased with increasing duration of waterlogging. The responses came earlier by Ilex viridis, followed by I. chinensis, and I. cornata var. fortunei. I. viridis could endure waterlogging for one week, while I. cornata var. fortunei could endure this stress for two weeks or longer. All the three species could be planted in the south of Yangtze River without any limitation of waterlogging. Drought tolerance experiment showed that the proline content in test species increased with increasing duration of drought, and I. viridis had the peak value earlier than I. chinensis and I. cornata var. fortunei. I. viridis could endure drought for 15 days, while I. cornata var. fortunei could endure it for 25 days. All the test species could endure water stress to some degree, I. cornata var. fortunei being the strongest, followed by I. chinensis, and I. viridis.