Cytokinin-dependent secondary growth determines root biomass in radish (Raphanus sativus L.)

The root serves as an essential organ in plant growth by taking up nutrients and water from the soil and supporting the rest of the plant body. Some plant species utilize roots as storage organs. Sweet potatoes (Ipomoea batatas), cassava (Manihot esculenta), and radish (Raphanus sativus), for exampl...

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Bibliographic Details
Published in:Journal of experimental botany 2015-08, Vol.66 (15), p.4607-4619
Main Authors: Jang, Geupil, Lee, Jung-Hun, Rastogi, Khushboo, Park, Suhyoung, Oh, Sang-Hun, Lee, Ji-Young
Format: Article
Language:English
Subjects:
Biomass
Cambium - cytology
Cambium - genetics
Cambium - growth & development
Cell Division
Cytokinins - metabolism
Gene Expression Regulation, Developmental
Gene Expression Regulation, Plant
Plant Proteins - genetics
Plant Proteins - metabolism
Plant Roots - cytology
Plant Roots - genetics
Plant Roots - growth & development
Raphanus - genetics
Raphanus - growth & development
Raphanus - metabolism
RESEARCH PAPER
Transcription Factors - genetics
Transcription Factors - metabolism
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Summary:The root serves as an essential organ in plant growth by taking up nutrients and water from the soil and supporting the rest of the plant body. Some plant species utilize roots as storage organs. Sweet potatoes (Ipomoea batatas), cassava (Manihot esculenta), and radish (Raphanus sativus), for example, are important root crops. However, how their root growth is regulated remains unknown. In this study, we characterized the relationship between cambium and radial root growth in radish. Through a comparative analysis with Arabidopsis root expression data, we identified putative cambium-enriched transcription factors in radish and analysed their expression in representative inbred lines featuring distinctive radial growth. We found that cell proliferation activities in the cambium positively correlated with radial growth and final yields of radish roots. Expression analysis of candidate transcription factor genes revealed that some genes are differentially expressed between inbred lines and that the difference is due to the distinct cytokinin response. Taken together, we have demonstrated for the first time, to the best of our knowledge, that cytokinin-dependent radial growth plays a key role in the yields of root crops.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/erv220