樟子松和油松根叶对春季干旱胁迫的响应

摘要/Abstract

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。

关键词: 谷氨酰胺合酶, ¹⁵N分配, 光合特性, 硝酸还原酶, 谷氨酸脱氢酶, 谷氨酸合酶

Abstract:

In the present study, the effects of spring drought stress on morphology and physiological characteristics of needles and roots of mature Pinus sylvestris var. mongolica and P. tabuliformis trees were analyzed, and the damage extents of the two tree species were compared. The results 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). Meanwhile, 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. mongolica 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 var. 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 indicated that the responses of P. sylvestris var. mongolica were more sensitive than P. tabuliformis under spring drought stress. The responses of needles were inconsistent with that of roots. The damages of drought were more severe to the needles of P. tabuliformis and the roots of P. sylvestris var. mongolica.

Key words: glutamine synthetase, ¹⁵N distribution, photosynthetic characteristics, nitrate reductase, glutamate synthase, glutamate dehydrogenase

王凯**,郭晶晶,王冬琦,刘爽,倪盼盼. 樟子松和油松根叶对春季干旱胁迫的响应[J]. 生态学杂志.

WANG Kai**, GUO Jing-jing, WANG Dong-qi, LIU Shuang, NI Pan-pan. Responses of roots and needles of Pinus sylvestris var. mongolica and Pinus tabuliformis to spring drought stress.[J]. cje.

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樟子松和油松根叶对春季干旱胁迫的响应

Responses of roots and needles of Pinus sylvestris var. mongolica and Pinus tabuliformis to spring drought stress.

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