南方农业学报2012，Vol.43Issue(7)：918-923,6.DOI:10.3969/j:issn.2095-1191.2012.07.918
外源ALA对低温胁迫下巴西蕉幼苗抗冷性的影响
Effect of exogenous ALA on chilling resistance of Brazil banana seedlings under low temperature stress
摘要
Abstract
[Objective]The current study was conducted to investigate the physiological effects and chilling injury mechanism of 5-aminolevulinio acid (ALA) on banana seedlings to provide basis for applying ALA in regulating chilling-resistance of banana seedling. [Method]After being sprayed with 1 mg/L ALA, Brazil banana seedlings were placed in an artificial climate box at low temperature stress (7℃) for 12, 24, 36 and 48 h, respectively Such parameters as plas-marnembrane permeability, contents of chlorophyll (Chl.), MDA, soluble proteins and proline, SOD and POD activities of banana leaves wen; investigated during stress period, normal temperature, and low temperature stress nf water were- set as CK1 and CK2, respectively. [Result]Compared to CK2, under low temperature stress, Chl. content, activities of SOD and POD, contents of proline and soluble proteins in Brazil banana increased obviously, while plasmamembrane permeability, MDA content and generation rate of superoxide free radical (O2-) decreased. After 36 h stress, Chl. content, activities of SOD and POD in leaves increased by 90.6, 11.7 and 58.4%, respectively, while generation rate of Of, plas-mamembrane permeability and MDA content decreased by 85.3, 27.6 and 37.1%, respectively. [Conclusion]Under low-temperature stress, exogenous ALA can improve cold-resistance of Brazil banana seedlings by enhancing SOD and POD activities, reducing generation rate of O2- and plasinatnembrane permeability, as well as increasing accumulation of proline and soluble protein and maintaining the stability of chlorophyll in leaves.关键词
巴西蕉/低温胁迫/ALA/抗冷性/生理机制Key words
Brazil banana/low-temperature stress/ALA/chilling resistance/physiological mechanism分类
农业科技引用本文复制引用
黄芳,李茂富,汪良驹,李绍鹏..外源ALA对低温胁迫下巴西蕉幼苗抗冷性的影响[J].南方农业学报,2012,43(7):918-923,6.基金项目
国家自然科学基金项目(30860170) （30860170）
海南大学青年基金资助项目(qnjj1160) （qnjj1160）
