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Identification and characterization of the MYC2 gene in relation to leaf senescence response in hybrid poplar (Populus alba × P. glandulosa)
J Plant Biotechnol 2017;44:409-415
Published online December 31, 2017
© 2017 The Korean Society for Plant Biotechnology.

Hyunmo Choi1・Eun-Kyung Bae1・Jin Seong Cho2・Hyoshin Lee1・Young-Im Choi1

1Forest Biotechnology Division, National Institute of Forest Science, Suwon 16631, Korea
2Department of Plant and Environmental New Resources, Kyung Hee University, Yongin 17104, Korea
Correspondence to: Y.-I. Choi (⊠)
Forest Biotechnology Division, National Institute of Forest Science, Suwon 16631, Korea
e-mail: yichoi99@korea.kr
Received September 20, 2017; Revised November 16, 2017; Accepted November 16, 2017.
cc This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The vegetation period of trees might be prolonged by the delay of the leaf senescence in autumn. Thus, we focused on the generation of senescence-delayed transgenic trees to enhance biomass production. The PagMYC2, a gene containing the basic helix-loop-helix domain, was selected as a candidate for a senescence-delayed transgenic tree. The PagMYC2 gene was specifically induced after treatment with phytohormone jasmonic acid, and upregulated by abiotic stresses such as salinity, osmotic pressure and a low temperature. The constitutive overexpression of the PagMYC2 delayed the leaf senescence and inhibited chlorophyll degradation in the transgenic poplars. Leaf senescence analysis was performed in the leaf tissues of the PagMYC2-overexpression transgenic poplars. The transgenic poplars exhibited higher photochemical efficiency than did a wild type plant under a short-day condition (6 hours light/ 18 hours darkness) or a low temperature condition (15°C) that was similar to the weather conditions of autumn. These results suggest that the PagMYC2 is a useful genetic resource to improve biomass production, which is able to sustain growth with senescence- delayed leaves for a long time in autumn.
Keywords : Leaf Senescence, Gene Expression, MYC2, Transgenic Poplar


December 2017, 44 (4)
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