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极小种群广西火桐幼苗对干旱复水的生理响应OA北大核心CSTPCD

Physiological Response of the Plant with Extremely Small Population Firmiana kwangsiensis to Drought Stress and Rehydration

中文摘要英文摘要

以广西火桐幼苗为材料,采用盆栽称重控水法,探究其在干旱复水条件下生长、光合气体交换和生理生化响应特征.结果表明:干旱胁迫下,广西火桐幼苗株高、基径和>5 cm侧根数均显著降低,且复水后无法恢复至对照水平;幼苗叶绿素含量在干旱-复水下呈现先下降后上升趋势;干旱胁迫显著降低幼苗光合作用能力和叶片相对含水量,但复水后基本能恢复至对照水平;干旱胁迫下,叶片相对电导率和MDA含量显著上升,复水后两者有所下降,且叶片相对电导率与对照相比无显著差异,而MDA含量仍显著高于对照水平;干旱胁迫下,叶片游离脯氨酸含量显著上升,复水后其含量有所下降,可溶性蛋白含量在干旱胁迫下与对照无显著差异,复水后,其含量呈现先下降后上升趋势,可溶性糖含量在干旱胁迫下呈现先上升后下降趋势,而复水后与对照无显著差异;干旱胁迫下SOD和POD呈现下降趋势,而复水后SOD和POD呈现上升趋势;CAT在干旱-复水处理下呈现增加趋势,但显著低于对照水平.因此,干旱胁迫下广西火桐幼苗的生长受到明显的抑制,复水后虽然能够通过调节自身的保护酶系统活性和渗透调节物质含量来减轻干旱带来的损伤,以维持植物体内的生理代谢功能,但其生长指标难以恢复到对照水平,因而表现出较弱的耐旱能力.

The growth,photosynthetic gas exchange and physiological and biochemical response characterist-ics of Firmiana kwangsiensis seedlings under drought rehydration were investigated by weighing the soil and pots.The result showed that the length of the plant,base diameter,and root number(>5 cm)decreased signific-antly,and could not recover to CK after rehydration.The chlorophyll content of seedlings firstly decreased and then increased under drought stress and rehydration.The photosynthetic activity and the relative water content of leaves in seedlings decreased under drought stress but could recover to CK level after rehydration.The relative electrical conductivity(RFC)and malondialdehyde(MDA)content of leaves were significantly increased under drought stress.After rehydration,the RFC decreased and could recover to CK level,but the MDA content was still higher than CK.Under the drought stress,the free proline content of leaves increased significantly,and de-creased after rehydration.The soluble protein content had no significant difference under drought stress but had a significant difference after rehydration.The soluble sugar content first increased and then decreased under drought stress and could be recovered to CK level after rehydration.Under the drought stress,the activity of SOD and POD was lower than CK level but increased after rehydration.The CAT activity increased under drought stress and rehydration but was still lower than the CK level.In summary,F.kwangsiensis seedlings growing inhibited under drought stress.Although the protective enzyme system and osmatic adjustment substance could adjust themselves to avoid drought harms after rehydration,the growth indexes were hard to recover to the CK level,which indicated the weak tolerant ability of F.kwangsiensis seedlings to drought stress.

陆奇丰;骆文华

中国科学院广西植物研究所,广西桂林 541006

林学

广西火桐干旱胁迫复水生理响应幼苗

Firmiana kwangsiensisdrought stressphysiological responseseedlingseedling

《西南林业大学学报》 2024 (007)

8-16 / 9

国家自然科学基金项目(31960083)资助.

10.11929/j.swfu.202309013

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