Abe J. and Morita S. eds. Root system management that leads to maximize rice yields. Root system management that leads to maximize rice yields.
Hybrid vigor increases grain yield.
The physiological characteristics of F1 hybrids are expressed by heterosis which is the ratio to the mean of parental lines. Nutrient uptake is a prerequisite for dry matter accumulation and is determined by the morphological characteristics and metabolic activity of roots. The major morphological characteristics related to grain yield are the dry matter partition to roots and root length. The root morphological characteristics of F1 hybrids have little been measured in the field. In addition, we analyzed the heteroses in root morphological characteristics related to dry matter accumulation and yield components to understand the relative importance of root heterosis to grain yield heterosis.