Abstract
Lateral root elongation is an important process that contributes to the establishment of root architecture. RCN1/OsABCG5 is firstly reported as an important protein for shoot branching in rice. In the present study, we addressed the alternative role of RCN1/OsABCG5 in root development using two reduced culm number 1 (rcn1) mutants, namely rcn1-1 and rcn1-2. Remarkable inhibition of lateral root elongation was identified in rcn1. In addition, we identified that remarkable inhibition of lateral root emergence on seminal root surface. The mutant specific phenotype was recovered by high temperature treatment suggesting that inhibition effect of rcn1 mutation was temperature sensitive. The present data represented that RCN1/OsABCG5 plays major role in root branching, involving two processes of elongation and emergence on seminal root surface.
