SLR1 inhibits MOC1 degradation to coordinate tiller number and plant height in rice

The breeding of cereals with altered gibberellin (GA) signaling propelled the ‘Green Revolution’ by generating semidwarf plants with increased tiller number. The mechanism by which GAs promote shoot height has been studied extensively, but it is not known what causes the inverse relationship between...

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Bibliographic Details
Published in:Nature communications 2019-06, Vol.10 (1), p.2738-9, Article 2738
Main Authors: Liao, Zhigang, Yu, Hong, Duan, Jingbo, Yuan, Kun, Yu, Chaoji, Meng, Xiangbing, Kou, Liquan, Chen, Mingjiang, Jing, Yanhui, Liu, Guifu, Smith, Steven M., Li, Jiayang
Format: Article
Language:English
Subjects:
38/1
38/77
42/41
631/449/1741/1521
631/449/2653
631/449/2675
82/111
82/29
82/80
Cereals
Degradation
Edible Grain
Elongation
Gene Expression Regulation, Plant - physiology
Gibberellins
Gibberellins - genetics
Gibberellins - metabolism
Green revolution
Humanities and Social Sciences
multidisciplinary
Mutation
Oryza
Oryza - physiology
Plant breeding
Plant Breeding - methods
Plant growth
Plant Proteins - genetics
Plant Proteins - metabolism
Plant Shoots - physiology
Plants, Genetically Modified
Proteolysis
Rice
Science
Science (multidisciplinary)
Signal Transduction - physiology
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Summary:The breeding of cereals with altered gibberellin (GA) signaling propelled the ‘Green Revolution’ by generating semidwarf plants with increased tiller number. The mechanism by which GAs promote shoot height has been studied extensively, but it is not known what causes the inverse relationship between plant height and tiller number. Here we show that rice tiller number regulator MONOCULM 1 (MOC1) is protected from degradation by binding to the DELLA protein SLENDER RICE 1 (SLR1). GAs trigger the degradation of SLR1, leading to stem elongation and also to the degradation of MOC1, and hence a decrease in tiller number. This discovery provides a molecular explanation for the coordinated control of plant height and tiller number in rice by GAs, SLR1 and MOC1. Due to reduced gibberellin sensitivity, modern rice cultivars are shorter than traditional varieties but produce more tillers and have higher yields. Here Liao et al. show that gibberellin contributes to decreased tiller number by degrading the MOC1 protein that suppresses bud outgrowth.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-019-10667-2