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Growth-Defense Trade-Offs Induced by Long-term Overgrazing Could Act as a Stress Memory.

التفاصيل البيبلوغرافية
العنوان: Growth-Defense Trade-Offs Induced by Long-term Overgrazing Could Act as a Stress Memory.
المؤلفون: Qu K; School of Ecology and Environment, Inner Mongolia University, Hohhot, China., Cheng Y; School of Ecology and Environment, Inner Mongolia University, Hohhot, China., Gao K; School of Ecology and Environment, Inner Mongolia University, Hohhot, China., Ren W; School of Ecology and Environment, Inner Mongolia University, Hohhot, China., Fry EL; Department of Biology, Edge Hill University, Ormskirk, United Kingdom., Yin J; School of Ecology and Environment, Inner Mongolia University, Hohhot, China., Liu Y; Inner Mongolia Mongolian Grass Seed Industry Science and Technology Research Institute Co., Ltd., Hohhot, China.
المصدر: Frontiers in plant science [Front Plant Sci] 2022 Jun 02; Vol. 13, pp. 917354. Date of Electronic Publication: 2022 Jun 02 (Print Publication: 2022).
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Frontiers Research Foundation Country of Publication: Switzerland NLM ID: 101568200 Publication Model: eCollection Cited Medium: Print ISSN: 1664-462X (Print) Linking ISSN: 1664462X NLM ISO Abbreviation: Front Plant Sci Subsets: PubMed not MEDLINE
أسماء مطبوعة: Original Publication: Lausanne : Frontiers Research Foundation, 2010-
مستخلص: Long-term overgrazing (OG) is one of the key drivers of global grassland degradation with severe loss of productivity and ecosystem functions, which may result in stress memory such as smaller stature of grassland plants. However, how the OG-induced stress memory could be regulated by phytohormones is unknown. In this study, we investigated the changes of four phytohormones of cloned offspring of Leymus chinensis that were developed from no-grazing (NG) plants and OG plants with a grazing history of 30 years. The concentrations of auxin (IAA) and gibberellic acid (GA) in OG plant leaves were 45% and 20% lower than control, respectively. Meanwhile, the level of abscisic acid (ABA) in OG leaves nearly doubled compared with that in NG leaves. The situation was quite similar in roots. Unexpectedly, no significant changes in the jasmonic acid (JA) level were observed between OG and NG plants. The changes in gene expression patterns between OG and NG plants were also investigated by transcriptomic analysis. In total, 302 differentially expressed genes (DEGs) were identified between OG and NG plants, which were mainly classified into the functions of synthesis, receptor, and signal transduction processes of phytohormones. The expression of 24 key genes related to the biosynthesis and signal transduction of IAA and GA was downregulated in OG plants. Among them, OASA1 and AO1 (regulating the biosynthesis of IAA and ABA, respectively) were reduced significantly by 88 and 92%, respectively. In addition, the content of secondary metabolites related to plant defense such as flavonoids and phenols was also increased in leaves. Taken together, the decrease of positive plant growth-related hormones (IAA and GA) together with the increase of plant stress-related hormones or factors (ABA, flavonoids, and phenols) induced the growth-defense trade-offs for L. chinensis adaptation to long-term OG stress. The findings reported in this study shed new light on the mechanism of plant-animal interaction in the grassland ecosystem and provide a deeper insight into optimizing grazing management and sustainable utilization of grassland.
Competing Interests: YL was employed by Inner Mongolia Mongolian Grass Seed Industry Science and Technology Research Institute Co., Ltd.. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
(Copyright © 2022 Qu, Cheng, Gao, Ren, Fry, Yin and Liu.)
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فهرسة مساهمة: Keywords: Leymus chinensis; growth-defense; overgrazing; phytohormone; stress memory
تواريخ الأحداث: Date Created: 20220620 Latest Revision: 20220716
رمز التحديث: 20231215
مُعرف محوري في PubMed: PMC9201768
DOI: 10.3389/fpls.2022.917354
PMID: 35720531
قاعدة البيانات: MEDLINE
الوصف
تدمد:1664-462X
DOI:10.3389/fpls.2022.917354