TITLE:
Identification and Genetic Characterization of a Novel Tillering Dwarf Semi-Sterile Mutant tdr1 in Rice
AUTHORS:
Bingrui Sun, Tingyou Huang, Chongyun Fu
KEYWORDS:
Rice, High Tillering, Dwarf, Semi-Sterile, Mapping
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.13,
December
5,
2018
ABSTRACT: Tillering and plant height
are important components of plant architecture and grain production in rice. We
identified a novel high tillering, dwarf and semi-sterile mutant, as named tdr1 in a
rice maintainer line E20 derived from the cross between between IR68888B and
Luxiang 90. The investigation of tiller dynamic in the tdr1 line
displayed 3 different phases: rapid increasing of tillers in the vegetative
growth stage, producing no new tillers in the transition stage from the
vegetative growth to reproductive growth, and regeneration of new tillers after
heading. The assay of hormones showed the significant reduction of brassinolide
level and no change of the levels of gibberellic acid, cytokinin and strigolactone
in the tdr1 line. Genetic analysis indicated the phenotype of
high tillering, dwarfism and semi-sterility is controlled by a recessive gene
in several different segregation populations. The TDR1 gene was mapped in the 105 kb interval between RM3288 and RM6590 on chromosome
4. Cloning of TDR1 gene would provide a new opportunity to uncover
the molecular mechanism of the development of plant height and tiller in rice.