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| Crosstalk of cold and gibberellin effects on bolting and flowering in flowering Chinese cabbage |
| SONG Shi-wei, LEI Yu-ling, HUANG Xin-min, SU Wei, CHEN Ri-yuan, HAO Yan-wei |
| College of Horticulture, South China Agricultural University, Guangzhou 510642, P.R.China |
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Abstract The flower stalk is the product organ of flowering Chinese cabbage (Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee), which is cultivated extensively in South China. Flower stalk formation and development, including bolting and flowering, determine the yield of flowering Chinese cabbage; however, the bolting and flowering mechanisms remain to be explored. To elucidate these processes, we studied the effects of low-temperature and gibberellin (GA) treatments, and their interaction, on stem elongation, bolting time, flowering time, hormone content, and cell morphology in stem of flowering Chinese cabbage. The results showed that both cold and GA treatments accelerated bolting time, stem elongation, and flowering time. Moreover, cold and GA cotreated plants displayed additive positive effects. In addition, cold treatments increased the GA, indole-3-acetic acid, and cytokinin contents and altered cell size in the shoot apices of flowering Chinese cabbage. Treatment with uniconazole, a GA synthesis inhibitor, strongly delayed bolting time, stem elongation, and flowering time, whereas GA, but not cold treatment, rescued this inhibition, indicating that low temperature accelerates bolting and flowering not only through inducing GA in the shoot apices, but also other ways. These results provide a theoretical basis for further dissecting the regulatory mechanism of bolting and flowering in flowering Chinese cabbage.
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Received: 12 March 2018
Accepted:
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| Fund: This work was supported by the earmarked fund for China Agriculture Research System (CARS-25-C-04) and the Natural Science Foundation of Guangdong, China (2016A030313399). |
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Corresponding Authors:
Correspondence CHEN Ri-yuan, Tel: +86-20-38294595, E-mail: rychen@scau.edu.cn; HAO Yan-wei, Tel: +86-20-85280228, E-mail: yanweihao@scau.edu.cn
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| About author: SONG Shi-wei, E-mail: swsong@scau.edu.cn; |
Cite this article:
SONG Shi-wei, LEI Yu-ling, HUANG Xin-min, SU Wei, CHEN Ri-yuan, HAO Yan-wei.
2019.
Crosstalk of cold and gibberellin effects on bolting and flowering in flowering Chinese cabbage. Journal of Integrative Agriculture, 18(5): 992-1000.
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