Blocking Gene that Inhibits Root Growth may Enhance Drought Resistance in Crops

Mar 09, 2023

A strong root system allows crops to absorb water and nutrients from the soil, but scientists have little information about the genes that control root development. Recent research published in New Phytologist reveals that blocking a negative regulator gene of root development leads to enhanced root growth in plants.

The gene, called RRS1 (Robust Root System 1), encodes an R2R3-type MYB family transcription factor that activates the expression of another gene (OsIAA3) that inhibits root growth. Knocking out RRS1 in plants led to longer root length, longer lateral root length, and larger lateral root density. Also, a natural variant of RRS1 that changes the activity of the RSS1 protein had a similarly beneficial effect on roots.

The findings indicate that blocking the normal expression of RSS1 may enhance drought resistance in crops by promoting water absorption.

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Video: Root Exudates, Soil Biology, and How Plants Recruit Microbes | Field Talk Friday

Field Talk Friday | Dr. John Murphy | Root Exudates, Soil Biology, and How Plants Recruit Microbes

Most of us spend our time managing what we can see above ground—plant height, leaf color, stand counts, and yield potential. But the deeper you dig into agronomy, the more you realize that some of the most important processes driving crop performance are happening just millimeters below the surface.

In this episode of Field Talk Friday, Dr. John Murphy continues the soil biology series by diving into one of the most fascinating topics in modern agronomy: root exudates and the role they play in shaping the microbial world around plant roots.

Roots are not passive structures simply pulling nutrients out of the soil. They are active participants in the underground ecosystem. Plants constantly release compounds into the soil—sugars, amino acids, organic acids, and other molecules—that act as both energy sources and signals for soil microbes.