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干旱胁迫对木薯（ Manihot esculenta Crantz）根际细菌群落结构的影响。

Influence of Drought Stress on the Rhizosphere Bacterial Community Structure of Cassava ( Crantz).

机构信息

School of Breeding and Multiplication, Sanya Institute of Breeding and Multiplication, Hainan University, Sanya 572025, China.

School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China.

出版信息

Int J Mol Sci. 2024 Jul 3;25(13):7326. doi: 10.3390/ijms25137326.

DOI:10.3390/ijms25137326
PMID:39000433
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11242396/
Abstract

Drought presents a significant abiotic stress that threatens crop productivity worldwide. Rhizosphere bacteria play pivotal roles in modulating plant growth and resilience to environmental stresses. Despite this, the extent to which rhizosphere bacteria are instrumental in plant responses to drought, and whether distinct cassava ( Crantz) varieties harbor specific rhizosphere bacterial assemblages, remains unclear. In this study, we measured the growth and physiological characteristics, as well as the physical and chemical properties of the rhizosphere soil of drought-tolerant (SC124) and drought-sensitive (SC8) cassava varieties under conditions of both well-watered and drought stress. Employing 16S rDNA high-throughput sequencing, we analyzed the composition and dynamics of the rhizosphere bacterial community. Under drought stress, biomass, plant height, stem diameter, quantum efficiency of photosystem II (Fv/Fm), and soluble sugar of cassava decreased for both SC8 and SC124. The two varieties' rhizosphere bacterial communities' overall taxonomic structure was highly similar, but there were slight differences in relative abundance. SC124 mainly relied on Gamma-proteobacteria and Acidobacteriae in response to drought stress, and the abundance of this class was positively correlated with soil acid phosphatase. SC8 mainly relied on Actinobacteria in response to drought stress, and the abundance of this class was positively correlated with soil urease and soil saccharase. Overall, this study confirmed the key role of drought-induced rhizosphere bacteria in improving the adaptation of cassava to drought stress and clarified that this process is significantly related to variety.

摘要

干旱是一种严重的非生物胁迫，威胁着全球作物的生产力。根际细菌在调节植物生长和对环境胁迫的适应能力方面起着关键作用。尽管如此，根际细菌在植物对干旱的响应中起到了何种作用，以及不同的木薯（Manihot esculenta Crantz）品种是否拥有特定的根际细菌组合，目前仍不清楚。在这项研究中，我们测量了耐旱（SC124）和干旱敏感（SC8）木薯品种在充分浇水和干旱胁迫条件下的生长和生理特性，以及根际土壤的物理和化学性质。采用 16S rDNA 高通量测序技术，我们分析了根际细菌群落的组成和动态。在干旱胁迫下，SC8 和 SC124 的生物量、株高、茎直径、光系统 II 的量子效率（Fv/Fm）和可溶性糖都有所下降。两个品种的根际细菌群落的总体分类结构非常相似，但相对丰度略有不同。SC124 主要依赖于 Gamma-proteobacteria 和 Acidobacteriae 来应对干旱胁迫，该类群的丰度与土壤酸性磷酸酶呈正相关。SC8 主要依赖于放线菌来应对干旱胁迫，该类群的丰度与土壤脲酶和土壤蔗糖酶呈正相关。总的来说，这项研究证实了干旱诱导的根际细菌在提高木薯适应干旱胁迫方面的关键作用，并阐明了这一过程与品种密切相关。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6e47/11242396/320fc702b2cb/ijms-25-07326-g010.jpg
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