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聚谷氨酸通过提高光合作用和影响根际微生物群落来增强玉米的抗旱性。

Poly-γ-glutamic acid enhanced the drought resistance of maize by improving photosynthesis and affecting the rhizosphere microbial community.

机构信息

State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, People's Republic of China.

School of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, Shandong, People's Republic of China.

出版信息

BMC Plant Biol. 2022 Jan 3;22(1):11. doi: 10.1186/s12870-021-03392-w.

DOI:10.1186/s12870-021-03392-w
PMID:34979944
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8722152/
Abstract

BACKGROUND

Compared with other abiotic stresses, drought stress causes serious crop yield reductions. Poly-γ-glutamic acid (γ-PGA), as an environmentally friendly biomacromolecule, plays an important role in plant growth and regulation.

RESULTS

In this project, the effect of exogenous application of γ-PGA on drought tolerance of maize (Zea mays. L) and its mechanism were studied. Drought dramatically inhibited the growth and development of maize, but the exogenous application of γ-PGA significantly increased the dry weight of maize, the contents of ABA, soluble sugar, proline, and chlorophyll, and the photosynthetic rate under severe drought stress. RNA-seq data showed that γ-PGA may enhance drought resistance in maize by affecting the expression of ABA biosynthesis, signal transduction, and photosynthesis-related genes and other stress-responsive genes, which was also confirmed by RT-PCR and promoter motif analysis. In addition, diversity and structure analysis of the rhizosphere soil bacterial community demonstrated that γ-PGA enriched plant growth promoting bacteria such as Actinobacteria, Chloroflexi, Firmicutes, Alphaproteobacteria and Deltaproteobacteria. Moreover, γ-PGA significantly improved root development, urease activity and the ABA contents of maize rhizospheric soil under drought stress. This study emphasized the possibility of using γ-PGA to improve crop drought resistance and the soil environment under drought conditions and revealed its preliminary mechanism.

CONCLUSIONS

Exogenous application of poly-γ-glutamic acid could significantly enhance the drought resistance of maize by improving photosynthesis, and root development and affecting the rhizosphere microbial community.

摘要

背景

与其他非生物胁迫相比，干旱胁迫会导致作物严重减产。聚γ-谷氨酸（γ-PGA）作为一种环保型生物大分子，在植物生长和调节中发挥着重要作用。

结果

本项目研究了外源γ-PGA 对玉米耐旱性的影响及其机制。干旱胁迫显著抑制了玉米的生长发育，但外源γ-PGA 处理显著增加了严重干旱胁迫下玉米的干重、ABA、可溶性糖、脯氨酸和叶绿素含量以及光合速率。RNA-seq 数据表明，γ-PGA 可能通过影响 ABA 生物合成、信号转导和光合作用相关基因以及其他应激响应基因的表达来增强玉米的耐旱性，这也得到了 RT-PCR 和启动子基序分析的验证。此外，根际土壤细菌群落的多样性和结构分析表明，γ-PGA 富集了放线菌门、绿弯菌门、厚壁菌门、α-变形菌门和δ-变形菌门等促进植物生长的细菌。此外，γ-PGA 显著改善了干旱胁迫下玉米根系发育、脲酶活性和 ABA 含量。本研究强调了利用γ-PGA 提高作物耐旱性和干旱条件下土壤环境的可能性，并揭示了其初步机制。

结论

外源聚γ-谷氨酸的施加可以通过改善光合作用和根系发育以及影响根际微生物群落来显著提高玉米的耐旱性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/ce3cc50c8d05/12870_2021_3392_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/1888353c409c/12870_2021_3392_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/cef9e090eaeb/12870_2021_3392_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/49ff629e284b/12870_2021_3392_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/ed0c9db90e54/12870_2021_3392_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/6f6e1f169f9d/12870_2021_3392_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/ce3cc50c8d05/12870_2021_3392_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/1888353c409c/12870_2021_3392_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/cef9e090eaeb/12870_2021_3392_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/49ff629e284b/12870_2021_3392_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/ed0c9db90e54/12870_2021_3392_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/6f6e1f169f9d/12870_2021_3392_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/174b/8722152/ce3cc50c8d05/12870_2021_3392_Fig6_HTML.jpg

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