欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

低温胁迫下芒果苗的受害症状及生理响应

唐力生1,王华1*,胡飞2,熊弦子2   

  1. (1广东省气候中心, 广州 510080; 2华南农业大学农学院, 广州 510642)
  • 出版日期:2016-10-10 发布日期:2016-10-10

Cold injury symptoms and physiological responses of mango seedlings under low temperature stress.

TANG Li-sheng1, WANG Hua1*, HU Fei2, XIONG Xian-zi2#br#   

  1. (1 Climate Center of Guangdong Province, Guangzhou 510080, China; 2College of Agriculture, South China Agricultural University, Guangzhou 510642, China).
  • Online:2016-10-10 Published:2016-10-10

摘要: 以1年生芒果嫁接苗(台农1号)为试验材料,对人工气候箱设置2、1、0、-1、-2和-3 ℃共6个日最低温(Tmin),在日较差分别为15 ℃和6 ℃下处理1~3 d。观察处理后芒果苗的叶片变化情况,并取其叶片测定超氧岐化酶活性、可溶性糖、游离脯氨酸和可溶性蛋白含量,以及离子渗出率、丙二醛含量等生理生化指标。综合叶片受害症状、生理指标与Tmin及其持续时间的关系,确定芒果苗期的低温受害指标,并在5个地理移置点进行自然低温试验,验证和完善芒果苗的短期寒害指标。结果表明:极端最低气温低于-1 ℃时芒果苗死亡;极端最低气温高于3 ℃(≤3 d)芒果苗正常生长;极端最低气温在3~5 ℃持续9 d,芒果苗的叶片无受害症状。本文结果可为芒果种植区划及引扩种提供参考。

关键词: 水生植物, 河岸带植物, 典范对应分析(CCA), 环境因子, 大型底栖动物, 群落特征

Abstract: One-year-old mango (Mangifera indica L. cv. Tainong 1) graft seedlings were experimented in climate growth chambers, in which six daily minimum temperatures (Tmin) were set as 2, 1, 0, -1, -2 and -3 ℃, with the daily range of 15 ℃ and 6 ℃ for 1, 2 or 3 d. The subsequent observation was conducted on the changes of leaves, and the relevant physiological indexes, including superoxide dismutase  activity, soluble sugars, proline, soluble proteins, and ion leakage, MDA concentrations in leaves of mango seedlings, were determined. The chilling injury index of mango seedlings was established based on the injury symptoms and the physiological indexes in relation to Tmin and its duration. Then a more precise index for short-term cold injury was procured with five geographical displacement experiments, in which mango seedlings were exposed to natural low temperature. The result showed that the mango seedlings were killed when low temperature was below -1 ℃, but they grew normally when low temperature was above 3 ℃ (≤3 d). When low temperature was between 3 and 5 ℃ for 9 days, mango seedlings showed no injury symptoms at all. The results provide reference for regionalization, introduction and extension of mango plants.

Key words: community characteristics, environmental factors, riparian zone plants, macrobenthos, CCA., aquatic macrophytes