Abstract
Adventitious roots account for the majority of the rice root system and play an irreplaceable role in rice growth and development. Rice adventitious roots are formed by division of the innermost ground meristem cells in the central cylinder, and some lateral roots are observable in the adventitious root system. Multiple hormones have been implicated in the regulation of root development. Auxin is involved in the initiation of adventitious roots, whereas cytokinin inhibits adventitious root initiation, but promotes adventitious root elongation. Other phytohormones such as nitric oxide, ethylene, brassinosteroid, jasmonic acid and gibberellin may be also involved in regulating adventitious root initiation and development. Additionally, more than 600 root development related quantitative trait loci (QTLs) have been located by QTL analysis of root traits.
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