Effects of PEG simulated drought on the germination of Chimonanthus praecox seeds and the physiological response of seedlings to drought

IF 1.7 4区农林科学 Q2 AGRONOMY

Seed Science and Technology Pub Date : 2022-01-01 DOI:10.15258/sst.2022.50.2.06

Tianyi Jiang, Lan Zhou

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引用次数: 0

Abstract

The effects of simulated drought on seed germination and seedling physiological response of Chimonanthus praecox under different concentrations of PEG-6000 (0, 5, 10, 15, 20 and 25%) were studied. The results of the study showed that as the degree of drought intensified, the germination percentage, germination potential, germination index and vigour index of C. praecox seeds decreased significantly. When the PEG-6000 concentration was 25%, the C. praecox seeds no longer germinated. As the degree of drought increased, the SOD activity in the seedlings of C. praecox showed a trend of first increasing and then decreasing, while the activities of POD and CAT showed increasing and decreasing trends respectively; the contents of MDA, soluble sugar and soluble protein rose with the degree of drought going up. Correlation analysis showed that all the germination indicators of C. praecox seeds were extremely and negatively correlated with MDA, and SOD, POD activity, soluble sugar and soluble protein content were extremely significantly positively correlated with MDA content. Therefore, the seedlings of C. praecox under drought circumstances might increase the activity of SOD and POD, and enhance the content of soluble sugar and soluble protein to alleviate the oxidative stress and improve the adaptability of seedlings to drought.

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PEG模拟干旱对春梅种子萌发及幼苗对干旱生理反应的影响

研究了不同PEG-6000浓度(0、5、10、15、20和25%)下模拟干旱对雷梅种子萌发和幼苗生理反应的影响。研究结果表明，随着干旱程度的加剧，青梅种子的发芽率、发芽势、发芽指数和活力指数均显著降低。PEG-6000浓度为25%时，青梅种子不再萌发。随着干旱程度的增加，青梅幼苗中SOD活性呈现先升高后降低的趋势，POD和CAT活性分别呈现升高和降低的趋势;MDA、可溶性糖和可溶性蛋白含量随干旱程度的升高而升高。相关分析表明，青梅种子各项萌发指标均与MDA呈极显著负相关，SOD、POD活性、可溶性糖和可溶性蛋白含量与MDA含量呈极显著正相关。因此，干旱条件下的青梅幼苗可通过提高SOD和POD活性，提高可溶性糖和可溶性蛋白含量，缓解氧化应激，提高幼苗对干旱的适应能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Seed Science and Technology 农林科学-农艺学

CiteScore

3.00

自引率

28.60%

发文量

审稿时长

>36 weeks

期刊介绍： Seed Science and Technology (SST) is an international journal featuring original papers and articles on seed quality and physiology related to seed production, harvest, processing, sampling, storage, genetic conservation, habitat regeneration, distribution and testing. A journal that meets the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality. Published every April, August and December.