渗透引发对紫花苜蓿种子抗旱性的影响——基于水势模型分析

生态学杂志

渗透引发对紫花苜蓿种子抗旱性的影响——基于水势模型分析

田雨¹,赵晓晨¹,张红香^2*

（¹吉林农业大学动物科学技术学院，长春 130118； ²中国科学院东北地理与农业生态研究所，长春 130102）

出版日期:2020-02-10 发布日期:2020-02-10

Effects of osmopriming on drought tolerance of alfalfa seeds based on hydrotime model analysis.

TIAN Yu¹, ZHAO Xiao-chen¹, ZHANG Hong-xiang^2*

(¹Animal Science and Technology College, Jilin Agricultural University, Changchun 130118, China; ²Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China).

Online:2020-02-10 Published:2020-02-10

摘要/Abstract

摘要： 渗透引发常用于提高种子活力，增强抗性。为了量化渗透引发对种子抗旱性的作用，本研究以紫花苜蓿（公农一号）为对象，聚乙二醇（PEG 6000）为引发剂，设置4个恒定温度（10、15、20和25 ℃）、6个干旱水平（0、-0.2、-0.4、-0.6、-0.8和-1.0 bar），开展常规发芽试验。采用聚乙二醇（PEG 6000）对紫花苜蓿种子进行引发并回干处理，利用水势模型计算相关参数。结果显示：渗透引发加快了紫花苜蓿种子的发芽速度。引发后的种子在较低水势条件下也具有较快的发芽速度。从水势模型参数来看，与未引发的紫花苜蓿相比，引发后的紫花苜蓿种子发芽的积势常数更低，引发后紫花苜蓿种子发芽的最低水势降低。这表明渗透引发降低了种子发芽所需的水势需求，可以使引发种子在更低的水势环境下发芽，提高抗旱性。

关键词: 光合作用, 抗氧化系统, 渗透调节, 中山杉, 干旱胁迫与恢复

Abstract: Osmopriming is often used to improve seed viability and stress tolerance. We quantified the osmopriming effects on drought tolerance of alfalfa (Gongnong No. 1) seeds, with polyethylene glycol (PEG 6000) as the priming agent. Four constant temperatures (10, 15, 20 and 25 ℃) and six drought levels (0 (distilled water as the control), -0.2, -0.4, -0.6, -0.8, and -1.0 bar) were set up for routine germination experiment. Alfalfa seeds were primed with polyethylene glycol (PEG 6000) and then dehydrated before germinati〖HJ*3〗on experiment. The hydrotime model was used to calculate the relevant parameters. The results showed that the osmopriming accelerated the germination rate of alfalfa seeds. The primed seeds had a fast germination speed under conditions of low water potential. With respect to water potential model parameters, the cumulative potential of the primed alfalfa seeds was lower than that of un-primed seeds. The lowest water potential of alfalfa seeds was decreased after priming. Our results indicated that osmopriming could decrease water potential requirement of seed germination and thus enable primed seeds germinate at lower water potential than unprimed seeds, which could improve drought resistance of seed germination.

Key words: Taxodium hybrid ‘Zhongshanshan’, antioxidase system, osmotic adjustment., photosynthesis, drought and recovery

田雨,赵晓晨,张红香. 渗透引发对紫花苜蓿种子抗旱性的影响——基于水势模型分析[J]. 生态学杂志.

TIAN Yu, ZHAO Xiao-chen, ZHANG Hong-xiang. Effects of osmopriming on drought tolerance of alfalfa seeds based on hydrotime model analysis. [J]. cje.

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