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Author Sakamoto,T., Morinaka,Y., Ohnishi,T., Sunohara,H., Fujioka,S., Ueguchi-Tanaka,M., Mizutani,M., Sakata,K., Takatsuto,S., Yoshida,S., Tanaka,H., Kitano,H. and Matsuoka,M.
Title Erect leaves caused by brassinosteroid deficiency increase biomass production and grain yield in rice.
Abstract:
New cultivars with very erect leaves, which increase light capture for photosynthesis and nitrogen storage for grain filling, may have increased grain yields. Here we show that the erect leaf phenotype of a rice brassinosteroid-deficient mutant, osdwarf4-1, is associated with enhanced grain yields under conditions of dense planting, even without extra fertilizer. Molecular and biochemical studies reveal that two different cytochrome P450s, CYP90B2/OsDWARF4 and CYP724B1/D11, function redundantly in C-22 hydroxylation, the rate-limiting step of brassinosteroid biosynthesis. Therefore, despite the central role of brassinosteroids in plant growth and development, mutation of OsDWARF4 alone causes only limited defects in brassinosteroid biosynthesis and plant morphology. These results suggest that regulated genetic modulation of brassinosteroid biosynthesis can improve crops without the negative environmental effects of fertilizers.
Journal Nat. Biotechnol.
Country
Volume 24(1)
Pages 105-109
Year 2005
PubMed ID 16369540
PubMed Central ID -
DOI 10.1038/nbt1173
URL -
Relation
Gene BRD1 CPD1 D11 DWARF4 DWARF4L
INSD AB206579 AB206580
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
-
Stages in Each Organ
- Muant Lines (Gene)
-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
/rice/oryzabase