AI Article Synopsis

  • Flooding can hinder the germination and growth of rice, but the plant has adapted strategies, such as fast coleoptile elongation, to survive by reaching for air.
  • A study analyzed the microbial communities in two rice varieties under submerged conditions, revealing that Arborio rice had a unique microbiota associated with longer coleoptiles.
  • Isolated bacteria from this study showed potential plant growth-promoting properties and, when tested on rice seeds, demonstrated varying effects based on the rice genotype.

Article Abstract

Flooding events caused by severe rains and poor soil drainage can interfere with plant germination and seedling establishment. Rice is one of the cereal crops that has unique germination strategies under flooding. One of these strategies is based on the fast coleoptile elongation in order to reach the water surface and re-establish the contact with the air. Microorganisms can contribute to plant health via plant growth promoters and provide protection from abiotic stresses. To characterise the community composition of the microbiome in rice germination under submergence, a 16S rRNA gene profiling metagenomic analysis was performed of temperate rice varieties Arborio and Lamone seedlings, which showed contrasting responses in terms of coleoptile length when submerged. This analysis showed a distinct microbiota composition of Arborio seeds under submergence, which are characterised by the development of a long coleoptile. To examine the potential function of microbial communities under submergence, culturable bacteria were isolated, identified and tested for plant growth-promoting activities. A subgroup of isolated bacteria showed the capacity to hydrolyse starch and produce indole-related compounds under hypoxia. Selected bacteria were inoculated in seeds to evaluate their effect on rice under submergence, showing a response that is dependent on the rice genotype. Our findings suggest that endophytic bacteria possess plant growth-promoting activities that can substantially contribute to rice seedling establishment under submergence.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9277545PMC
http://dx.doi.org/10.3389/fpls.2022.908349DOI Listing

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