Genetic Analysis Of New Regulator Genes For Deepwater Response In Deepwater Rice.

Abstract

Deepwater rice is cultivated in Southeast Asia where serious flood occurs periodically. To avoid flood condition, deepwater rice elongates its internode along with the rising water. QTL analysis revealed one major QTL for internodal elongation on the long arm of chromosome 12. By positional cloning, we identified two genes, named Snorkel1 (SK1) and Snorkel2 (SK2) regulated deepwater esponse. However, Snorkels are insufficient to elongate under the deep-water, and it is necessary for other QTL to interact. Inthis study, to elucidate the mechanism of internode elongation in rice, we performed the genetic analysis to identify the other QTL, using NIL-lines and pyramiding-lines.