PJB-2019-601
A NEW GENETIC FACTOR REGULATING ROOT ELONGATION IN RICE (Oryza sativa L.)
JIMING XU
Abstract
Root elongation is an important factor determining root architecture. To understand the mechanism underlying root elongation in rice, we isolated a novel rice mutant with increased root length and designated it deep root1 (drt1). Under normal growth conditions, the mutant exhibited longer primary roots and more desirable agronomic traits. Propidium iodide staining and confocal microscopy observation of root tips revealed that drt1 had more cells in the meristem zone, indicative of an enlarged meristem. In addition, the length of the cells in the mature zone was increased in drt1. Roots of the drt1 mutant were hypersensitive to low Pi stress, showing more rapid induction of root elongation than wild type. Genetic analysis indicated that the phenotype of the drt1 mutant was caused by a single recessive mutation, which was mapped to a 254-kb region between S1-3435K and S1-3689K on the short arm of chromosome 1.
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