干旱胁迫下水稻根鞘微生物群落结构

Microbial community structure in rice rhizosheaths under drought stress

在干旱胁迫条件下,水稻根系表面能形成根鞘以提高其水分利用效率。根鞘中微生物也具有提高水稻抗旱能力的潜在作用,但是目前对干旱胁迫下水稻根鞘中微生物群落的研究还很少。本研究比较了3种条件下(充分灌溉、干旱胁迫Ⅰ和干旱胁迫Ⅱ)的水稻根系性状、根鞘形成和根鞘微生物群落。研究结果表明,灌溉处理显著影响土壤微生物组成和共线性网络。干旱肋迫条件能促进一些有益微生物在根鞘中积累,如镔骨细菌门(Patescibacteria)、马赛菌属(Massilia)、类诺卡氏菌属(Nocardioides)、弗拉特氏菌属(Frateuria)、Angustibacter细菌和篮状菌属(Talaromyces)真菌;此外,干旱也是促进水稻根鞘中有害真菌积累的一个潜在危害因素。这些研究结果表明,根鞘和根鞘微生物都具有提高水稻抗旱性的潜力。在今后的研究中,分离并应用根鞘中的有益微生物,并与科学的灌溉方式相结合,是实现水稻绿色栽培的有效途径之一。

Rhizosheaths can form on the surface of rice(Oryza sativa L.)roots and improve the water-use efficiency of rice under drought stress.The microbes in rhizosheaths can also offer the potential to increase the resilience of rice to future drought.However,lttle is known about the microbial community in rhizosheath of rice under drought stress.In this study,we compared the root traits,rhizosheath formation and microbial community in the rhizosheath under three irrigation regimes,including well-watered and drought treatments I and Il.The irrigation plays important roles in influencing the microbial composition and co-occurrence networks.Drought can promote the accumulation of beneficial microorganisms in rhizosheaths,such as bacteria that are members of the phylum Patescibacteria and the Massilia,Nocardioides,Frateuria and Angustibacter genera and fungi in the genus Talaromyces.However,drought can also induce risk factors for harmful fungi in rice rhizosheaths.Our results suggest that both the rhizosheath and microbes in rhizosheath can offer the potential to improve the resistance of rice to drought.In the future,the isolation and application of beneficial microorganisms in rhizosheaths and scientific planting methods should be studied for the green cultivation of rice.