Hooked hairs: A cellular key adaptation aiding seedling survival in nutrient-limited and drought conditions.

Abstract

Understanding plant survival mechanisms in degraded, drought-affected, and nutrient-limited soils can help mitigate the effects of climate change on crop production. Roots extend deep into soil through straight, tubular root hairs that facilitate resource uptake. In this study, we found a unicellular structure, termed the "hooked hair," characterized by a pointed hook morphology that supports seedling establishment before root hair emergence. We observed a phenotypic response of hooked hairs to phosphorus and nitrogen limitations. Coexpression analysis identified gene signatures associated with nutrient transport and suberin biosynthesis in hooked hairs. These biological functions are likely critical for seedling establishment, nutrient acquisition, and protection against biotic stress. Therefore, the hooked hair offers potential for the development climate-resilient seedlings, reducing reliance on unsustainable fertilizers and securing agricultural productivity.