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The Cm14-3-3μ protein and CCT transcription factor CmNRRa delay flowering in chrysanthemum. | LitMetric

The Cm14-3-3μ protein and CCT transcription factor CmNRRa delay flowering in chrysanthemum.

J Exp Bot

State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, Ministry of Agriculture and Rural Affairs, Key Laboratory of Biology of Ornamental Plants in East China, National Forestry and Grassland Administration, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China.

Published: August 2023

AI Article Synopsis

Article Abstract

The floral transition from vegetative to reproductive growth is pivotal in the plant life cycle. NUTRITION RESPONSE AND ROOT GROWTH (OsNRRa), as a CONSTANS, CONSTANS-LIKE, TOC1 (CCT) domain protein, delays flowering in rice, and an orthologous protein, CmNRRa, inhibits flowering in chrysanthemum; however, the underlying mechanism remains unknown. In this study, using yeast two-hybrid screening, we identified the 14-3-3 protein family member Cm14-3-3µ as a CmNRRa-interacting protein. A combination of bimolecular fluorescence complementation, pull-down, and co-immunoprecipitation assays was performed to confirm the physical interaction between CmNRRa and Cm14-3-3µ. In addition, expression analysis showed that CmNRRa but not Cm14-3-3µ responded to the diurnal rhythm, whereas both genes were highly expressed in leaves. Moreover, the function of Cm14-3-3µ in flowering time regulation was similar to that of CmNRRa. Furthermore, CmNRRa repressed chrysanthemum FLOWERING LOCUS T-like 3 (CmFTL3) and an APETALA 1 (AP1)/FRUITFULL (FUL)-like gene (CmAFL1) but induced TERMINAL FLOWER1 (CmTFL1) directly by binding to their promoters. Cm14-3-3µ enhanced the ability of CmNRRa to regulate the expression of these genes. These findings suggest that there is a synergistic relationship between CmNRRa and Cm14-3-3µ in flowering repression in chrysanthemum.

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http://dx.doi.org/10.1093/jxb/erad130DOI Listing

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The Cm14-3-3μ protein and CCT transcription factor CmNRRa delay flowering in chrysanthemum.

J Exp Bot

August 2023

State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, Ministry of Agriculture and Rural Affairs, Key Laboratory of Biology of Ornamental Plants in East China, National Forestry and Grassland Administration, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China.

The floral transition from vegetative to reproductive growth is pivotal in the plant life cycle. NUTRITION RESPONSE AND ROOT GROWTH (OsNRRa), as a CONSTANS, CONSTANS-LIKE, TOC1 (CCT) domain protein, delays flowering in rice, and an orthologous protein, CmNRRa, inhibits flowering in chrysanthemum; however, the underlying mechanism remains unknown. In this study, using yeast two-hybrid screening, we identified the 14-3-3 protein family member Cm14-3-3µ as a CmNRRa-interacting protein.

View Article and Find Full Text PDF

Altered expression of CmNRRa changes flowering time of Chrysanthemum morifolium.

Plant Biotechnol J

April 2013

State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China; National Plant Gene Research Center, Beijing, China.

Flowering time is an important ornamental trait for chrysanthemum (Chrysanthemum morifolium, Dendranthema x grandiflorum) floricultural production. In this study, CmNRRa, an orthologous gene of OsNRRa that regulates root growth in response to nutrient stress in rice, was identified from Chrysanthemum and its role in flowering time was studied. The entire CmNRRa cDNA sequence was determined using a combinatorial PCR approach along with 5' and 3' RACE methods.

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