Research articles

Effects of Exogenous Gibberellin on Rice Seed Germination and Seedling Growth under Salt Stress

  • QIAO Jiao
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  • (Shanxi University of Electronic Science and Technology, Linfen 041000, Shanxi China)

Received date: 2024-07-18

  Accepted date: 2024-08-19

  Online published: 2025-03-20

Abstract

This experiment investigated the effects of different concentrations of gibberellin (25, 50, 100 mg·L–1) on rice seed germination and seedling growth under sodium chloride stress. The results showed that during the seed germination stage, exogenous gibberellin enhances the germination of rice seeds under salt stress, with an increase in germination vigor, germination rate, and germination index, and a decrease in relative damage rate. During the growth stage of seedlings, morphological analysis showed that exogenous gibberellin alleviated the inhibition of salt stress on seedling growth, resulting in an increase in plant height, root length, root tip number, and leaf area; Physiological and biochemical analysis showed that exogenous gibberellin improved the activity of superoxide dismutase (SOD) in rice leaves under salt stress, reduced the content of malondialdehyde (MDA) in leaves, increased the content of photosynthetic pigments including chlorophyll a, b and carotenoids, enhanced photosynthesis, increased the effective quantum yield of PSⅡ [Y(Ⅱ)] and the photochemical quenching coefficient (qP), and decreased the non photochemical quenching coefficient (NPQ). In summary, exogenous gibberellin soaking treatment significantly promoted the germination of rice seeds under salt stress, the effects of sodium chloride stress on seedling growth and development was significantly reduced after spraying exogenous gibberellin, and the optimal concentration of gibberellin was 50 mg·L–1. The research results provide a theoretical basis for optimizing rice cultivation in saline soil.

Cite this article

QIAO Jiao . Effects of Exogenous Gibberellin on Rice Seed Germination and Seedling Growth under Salt Stress[J]. Subtropical Plant Science, 2024 , 53(6) : 512 -519 . DOI: 10.3969/j.issn.1009-7791.2024.06.003

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