WANG Chaoying,FANG Wen,CHEN Lihua,et al.Growth and Physiological Response of Cercis canadensis ‘Forest Pansy’ Under Different Drought Stress[J].Northern Horticulture,2020,44(20):62-69.[doi:10.11937/bfyy.20194236]
红叶加拿大紫荆对不同强度干旱胁迫的生长及生理响应
- Title:
- Growth and Physiological Response of Cercis canadensis ‘Forest Pansy’ Under Different Drought Stress
- Keywords:
- Cercis canadensis ‘Forest Pansy’; drought; growth; physiology
- 文献标志码:
- A
- 摘要:
- 以一年生红叶加拿大紫荆苗木为试材，采用人工控水方法，研究了4种水分处理（对照组CK：80%田间持水量；轻度干旱组T1：60%田间持水量；中度干旱组T2：45%田间持水量；重度干旱组T3：30%田间持水量）及随后的恢复处理对苗木生长和生理的影响，以期了解红叶加拿大紫荆对水分胁迫的敏感性，为其引种栽植提供参考依据。结果表明：干旱胁迫会造成红叶加拿大紫荆苗木可溶性糖含量升高，淀粉含量降低，超氧阴离子和丙二醛（MDA）含量持续升高，超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）活性先升高后降低。且随着干旱程度的加剧和时间的延长，各生理指标反应更加激烈，且苗木存活率和苗木株高、地径、冠幅及分枝数等均表现出随干旱程度的加剧和时间的延长持续降低的趋势。复水1个月后，不同程度干旱处理组各生理指标均向对照组靠拢。这表明红叶加拿大紫荆苗木具有一定的干旱耐受性，短期轻度干旱对其正常生长影响甚微，但中度及以上干旱发生时应当及时补水。
- Abstract:
- One-year-old seedlings of Cercis canadensis ‘Forest Pansy’ were used as materials，and four different kinds of water stress (the control group，CK，80% of field water holding capacity；mild drought group，T1，60% of field water holding capacity；moderate drought group，T2，45% of field water holding capacity；severe drought group，T3，30% of field water holding capacity) and subsequent restoration treatments conducted by artificial water control were applied to examine the growth and physiological response of the seedlings.The aim of the study was to understand the sensitivity of C.canadensis to water stress and provide management for its introduction and planting.The results showed that the soluble sugar，superoxide anion and MDA contents of the seedlings were increased under drought stress.While the starch contents of the seedlings were decreased under drought stress.Unlike the previous change，the activity of SOD，POD and CAT were increased and then decreased.Furthermore，these changes were intense with the drought stress increase and the prolongation of treatment time.The survival rate，plant height，base diameter，crown area and number of branches decreased with the drought stress increase and the prolongation of treatment time.After 1 month of recovery，the physiological indexes of the drought-stress groups were close to the level of the control group.These results indicated that C.canadensis seedlings had a certain drought tolerance.Short period of mild drought stress had little effect on its normal growth，but water should be added in time when moderate or above drought occurs.
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备注/Memo
第一作者简介：王朝英（1988-），女，博士，讲师，现主要从事植物及生理生态等研究工作。E-mail:532445102@qq.com.责任作者：谢英赞（1987-），男，硕士，高级工程师，现主要从事木本花卉遗传育种及抗逆生理等研究工作。E-mail:449080978@qq.com.基金项目：重庆市林业重点科技攻关资助项目（渝林科研2017-3）。收稿日期：2019-11-08