LaCl_3对辣椒种子酸雨胁迫的缓解效应及其评价  

Alleviative Effect and Its Evaluation of LaCl_3 Treatment on Acid Rain Stresses for Capsicum Seed Germination

作　　者：边才苗[1] 王锦文[1] 

机构地区：[1]台州学院生命科学学院,浙江临海317000

出　　处：《中国稀土学报》2011年第3期371-376,共6页Journal of the Chinese Society of Rare Earths

基　　金：浙江省自然科学基金项目(Y507053)资助

摘　　要：采用两种评价系统分析了镧对酸雨胁迫下辣椒种子萌发的影响。结果表明,经10 mg.L-1的LaC l3浸种,可显著缓解酸雨(pH 3.5,3.0,2.5和2.0)对辣椒种子的伤害,以活力指数的增幅为标准,缓解能力依次为14.48%,19.24%,15.14%和13.48%;以指标值的增量为标准,只有pH 3.5和3.0时显著提高。同时,镧处理可提高酸雨胁迫下超氧化物歧化酶、过氧化氢酶和过氧化酶的活性,减少丙二醛的积累,在pH≤2.5时,与酸雨处理差异显著,而pH≥3.0时没有明显变化,说明镧处理分别提高种子的抗性和耐受性。基于生长指标是间接的抗逆性指标,不宜作为评价的主体。活性氧代谢指标都有一个阈值,可依据指标值进入正常阈的可能性进行评价。该法的缺点是正常阈只有近似值,但可反映作物生长改善的本质。Alleviative effects of LaCl3 on acid rain（AR） stresses for capsicum seed were analyzed using two evaluation systems.The results showed that the damage of AR（pH 3.5,3.0 and 2.0） were alleviated by treating the seeds with LaCl3 solution（10 mg · L-1）.The alleviative effects were 14.48%,19.24%,15.14% and 13.48% as a relative rate of vigor index.However,the vigor index in seeds treated with LaCl3 and AR（pH 3.5 and 3.0） was significantly higher than with only AR as its increment.Meanwhile,the destructions of superoxide dismutase（SOD）,peroxidase（POD） and catalase（CAT） reduced notably,and accumulation of malondialdehyde（MDA） reduced at pH≤2.5;whereas these indexes did not change obviously at pH≥3.0.This indicated that LaCl3 probably alleviated AR damage by improving the seed resistance at pH≤2.5 and the seed tolerance at pH≥3.0.The growth index was an indirect indicator of the resistance,so should not be used as main evaluation system.The activate oxygen metabolic indices had their threshold values,but should be evaluated based on possibility which the index felt within its threshold value range.This method just gave an approximate threshold values,but could show inner causes for improving growth of crop species.

关 键 词：LACL3 酸雨胁迫 辣椒 发芽指标 活性氧代谢 评价 稀土 

分 类 号：O614.3[理学—无机化学]