With India importing more than half of its edible oil, a dependence that met roughly 56% of domestic demand in 2023–24, and the government pushing for self-reliance, the research could offer plant breeders and farmers a new foundation for producing high-yielding hybrid mustard.

The study, a collaboration with the Indian Council of Agricultural Research-Directorate of Rapeseed-Mustard Research (ICAR-DRMR), Bharatpur, was recently published in Frontiers in Plant Science.

Many flowering plants have a built-in system called self-incompatibility (SI). Self-rejection, or SI, allows a flower to reject its own pollen and accept pollen from other plants. By refusing self-pollen, a plant forces crossbreeding, which mixes genes, avoids inbreeding and produces offspring that are often hardier and more productive than either parent. This maintains genetic diversity and promotes hybrid vigor.

A breeding shortcut in flowers

For agricultural breeders seeking to develop high-yielding hybrid seeds, this self-rejection system is a gift, sparing breeders the tedium of removing pollen by hand from thousands of flowers. Producing hybrid seeds on a commercial scale is difficult if the maternal plant destroys its own pollen or, conversely, if it self-pollinates accidentally before the breeder can introduce the partner line.