RRC ID 3665
Author Yamaki S, Satoh H, Nagato Y.
Title Gypsy embryo specifies ovule curvature by regulating ovule/integument development in rice.
Journal Planta
Abstract The embryo position in a seed is stable in most plant species, indicating the existence of a strict regulatory mechanism that specifies the embryo position in the seed. To elucidate this mechanism, we analyzed the gypsy embryo (gym) mutant of rice, in which the position of the mature embryo in the seed is altered at a low frequency. Analyses of early embryogenesis and ovule development showed that the ectopic embryo was derived from an ill-positioned egg cell, which resulted from the incomplete curvature of the ovule. Although the development of both the inner and outer integuments was impaired, the ovule curvature was associated closely with the extent of inner integument growth. Therefore, inner integument development controls ovule curvature in rice. The expression patterns of OSH1 and OsMADS13 indicated that, in gym, a small number of indeterminate cells are maintained on the style side of the ovule and then in the integument primordium at a low frequency. The prolonged survival of these indeterminate cells disturbs normal integument development. The gym fon2 double mutant suggests that GYM and FON2 are involved redundantly in floral meristem determinacy. Possible functions of the GYM gene and the ovule developmental mechanism are discussed.
Volume 222(3)
Pages 408-17
Published 2005-10
DOI 10.1007/s00425-005-1547-z
PMID 16001259
MeSH Gene Expression Profiling Gene Expression Regulation, Developmental Gene Expression Regulation, Plant Homeodomain Proteins / genetics Homeodomain Proteins / metabolism MADS Domain Proteins / genetics MADS Domain Proteins / metabolism Mutation Oryza / cytology Oryza / embryology* Oryza / genetics Phenotype Plant Proteins / genetics Plant Proteins / metabolism Seeds / anatomy & histology Seeds / cytology Seeds / embryology* Seeds / genetics Trans-Activators / genetics Trans-Activators / metabolism
IF 3.249
Times Cited 9
Rice Induced Mutation Lines