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Erect leaves caused by brassinosteroid deficiency increase biomass production and grain yield in rice
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Erect leaves caused by brassinosteroid deficiency increase biomass production and grain yield in rice
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Journal Article
Erect leaves caused by brassinosteroid deficiency increase biomass production and grain yield in rice
2006
Overview
New cultivars with very erect leaves, which increase light capture for photosynthesis and nitrogen storage for grain filling, may have increased grain yields
1
. 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.
Publisher
Nature Publishing Group US,Nature,Nature Publishing Group
Subject
/ Biological and medical sciences
/ Biomass
/ Biomedical and Life Sciences
/ Biomedical Engineering/Biotechnology
/ Fruit
/ Fruit - growth & development
/ Fundamental and applied biological sciences. Psychology
/ genes
/ Genetic Enhancement - methods
/ genetics
/ Grain
/ Leaves
/ letter
/ methods
/ mutants
/ Mutation
/ Nitrogen
/ Oryza
/ Plants, Genetically Modified
/ Plants, Genetically Modified - physiology
/ Protein Kinases - deficiency
/ Rice
/ shoots
