镧浸种对辣椒种子抗酸雨胁迫能力的强化作用

为了检测镧浸种对辣椒种子抗酸雨胁迫能力的影响,对来自辣椒种子经镧处理和酸雨胁迫1,3和7 d的幼苗生长状况和活性氧代谢进行了测定。结果显示:经镧溶液浸种后,辣椒种子的抗酸雨能力增强,可抵御中强酸雨(pH 3.5)持续胁迫7 d,表现为胚根长和幼苗鲜重均达到对照水平;相对于酸雨组,镧处理组辣椒幼苗中POD活性提高了5.4%,MDA含量降低了6.9%;酸雨组的POD活性和MDA含量均高于对照,分别提高3.9%和25.5%,说明酸雨引发的POD合成是应急,不能有效地限制MDA的积累;基于镧对照的POD活性比对照高,而MDA含量没有相应的提高,说明镧浸种提高了幼苗中POD活性的本底水平。因此,稀土元素是作物的免疫刺激物,镧浸种属于抗胁迫锻炼。

Strengthening Effects of LaCl3 Treatment on Resistance of Capsicum Seeds to Acid Rain Stress

To test the resistance of Capsicum seed soaked by LaCl3 solution(10 mg · L-1) to the acid rain(AR) stress,the growth and activate oxygen metabolism of Capsicum seedlings from the seeds treated with La+AR for 1,3 and 7 days were investigated,respectively.The results showed that the resistance of Capsicum seed to AR stress was improved after the seeds were soaked in LaCl3 solution,i.e.the resistance of the seeds treated with La to the AR stress(pH 3.5) lasted totally for 7 days(7AR),while the control seeds without La treatment lasted only AR for 3 days.And the root length and fresh weight showed no significant difference from the seeds without treatment(CK).Compared with the seedlings from seeds treated with 7AR(pH 3.5),the activity of POD in the seedlings from seeds treated with La+7AR increased 5.4%,and the content of MDA decreased 6.9%.POD activity and MDA content were higher in the seedlings from seeds treated with 7AR than the CK seedlings,and increased individually 3.9% and 25.5%.It indicated that the formation of POD caused by AR was an emergency reaction,which could not effectively inhibit MDA accumulation.POD activity in seedlings from seeds treated only with La was higher than that in the CK seedlings,while MAD content was the same as that in the control seedlings,showing that seeds treated with La increased the basic activity of POD in the control seedlings.Therefore,the current study suggested that the rare earth is an immunological stimulator and the seeds soaked with LaCl3 solution belongs to an anti-stress acclimation.