摘要
以成年樟子松和油松为对象,分析春季干旱胁迫对叶片和根系形态和生理特性的影响,比较2个树种在干旱胁迫下的响应程度和受伤害大小。结果表明:樟子松叶片含水量、脯氨酸含量、POD和CAT活性均显著高于油松(P<0.05),根系活力、含水量、可溶性蛋白和脯氨酸含量及CAT活性、比根长和比表面积均显著高于油松(P<0.05)。樟子松叶片丙二醛含量显著低于油松(P<0.05),而根系丙二醛含量显著高于油松(P<0.05)。可溶性糖和脯氨酸含量及SOD活性在叶片中显著大于根系(P<0.05),可溶性蛋白含量及CAT活性在樟子松叶片中显著小于根系(P<0.05),POD活性在油松叶片中显著低于根系(P<0.05)。上述结果表明,春季干旱胁迫下,樟子松比油松做出了更积极的响应,叶片和根系的响应关系不对应,干旱胁迫对油松叶片伤害更大,而对樟子松根系伤害更大。
In the present study, the effects of spring drought stress on morphology and physiologi- cal characteristics of needles and roots of mature Pinus sylvestris var. mongolica and P. tabulifor- mis trees were analyzed, and the damage extents of the two tree species were compared. The re- sults showed that the water and proline contents, and POD and CAT activities in needles of P. sylvestris var. mongolica were significantly higher than those of P. tabuliformis （P〈0.05）. Mean- while, the root activity, water, soluble protein and proline contents, and CAT activity, specific root length and specific root surface area of P. sylvestris var. mongolica were significantly higher than those of P. tabuliformis （P〈0.05）. The malondialdehyde content in needles was significantly lower in P. sylvestris var. mongolica than in P. tabuliformis （P〈0.05） , but the value in roots of P. sylvestris var. mongoliea was significantly higher than that in P. tabuliformis （P〈0.05）. The soluble sugar and proline contents, and SOD activity in needles were significantly greater than those in roots （P〈0.05）. However, the soluble protein content and CAT activity in needles of P. sylvestris vat. mongolica were significantly lower than those in roots （P〈0.05）. POD activity in needles of P. tabuliformis was significantly lower than that in roots （P〈0.05）. These results indi- cated that the responses of P. sylvestris vat. mongolica were more sensitive than P. tabuliformis under spring drought stress. The responses damages of drought were more severe to the var. mongolica. of needles were inconsistent with that of roots. The needles of P. tabuliformis and the roots of P. sylvestris
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第11期3132-3138,共7页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31400613)资助
关键词
春季干旱
根-叶关系
大树
抗旱性
spring drought
root-leaf relation
mature tree
drought resistance.
