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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 151 - 160 (10page)
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초록· 키워드
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Secondary wall is an important component of xylem tissue, as it maintains the integrity of the vessel elements and provides mechanical strength for upward growth of plants. Enough prior evidence has linked secondary wall thickening with auxinsignaling pathway. Hence, plants showing auxin-mediated effects might demonstrate alteration of secondary wall depositions. GUS expression from promoter of NAC68 (pMusaNAC68) was observed in many organs with strong expression in vascular tissues. Transgenic banana plants overexpressing NAC68 transcription factor were analyzed for lignin and secondary wall depositions. Strong reduction of lignin in cross-sections of transgenic lines was observed by phloroglucinol-HCl and toluidine blue-O staining. The reduction of secondary wall thickness observed after calcofluor white staining was substantiated by data from scanning electron microscopy indicating reproducibly lower secondary wall depositions. A strong reduction in transcript levels of PAL, 4CL, C4H, COMT and CcOAMT was observed due to the overexpression of NAC68. Furthermore, substantial elevation of MYB transcription factors such as MYB4a-like and MYB4b-like which are probable repressors of phenylpropanoid biosynthesis pathway was also observed. Expression of MYB transcription factors, MYB85-like and MYB58-like which are probable activators of secondary wall depositions, was remarkably downregulated after NAC68 overexpression. Transgenic lines also showed altered expression of genes coding for cellulose synthase subunits with remarkable elevation in expression of a close homologue of Arabidopsis CesA8, which functions in cellulose deposition during secondary wall development. The study indicated a novel function of NAC68 transcription factor in regulating secondary wall thickening and will enhance our knowledge about crosstalk between auxin-signaling and secondary wall depositions.
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참고문헌 (39)
참고문헌 신청
Aloni R / 1990 / The role of auxin and gibberellin in controlling lignin formation in primary phloem fibers and in xylem of Coleus blumei stems / Plant Physiol 94:1743~1747
Ambavaram MM / 2011 / Coordinated activation of cellulose and repression of lignin biosynthesis pathways in rice / Plant Physiol 155:916~931
Cassan-Wang H / 2013 / Identification of novel transcription factors regulating secondary cell wall formation in Arabidopsis / Front Plant Sci 4:189
Cavallini E / 2015 / The phenylpropanoid pathway is controlled at different branches by a set of R2R3-MYB C2 repressors in grapevine / Plant Physiol 167:1448~1470
Cernadas RA / 2009 / Role of auxin and gibberellin in citrus canker development and in the transcriptional control of cell-wall remodeling genes modulated by Xanthomonas axonopodis. pv. citri / Plant Sci 177:119~190
Ambavaram MM / 2011 / Coordinated activation of cellulose and repression of lignin biosynthesis pathways in rice / Plant Physiol 155:916~931
Cassan-Wang H / 2013 / Identification of novel transcription factors regulating secondary cell wall formation in Arabidopsis / Front Plant Sci 4:189
Cavallini E / 2015 / The phenylpropanoid pathway is controlled at different branches by a set of R2R3-MYB C2 repressors in grapevine / Plant Physiol 167:1448~1470
Cernadas RA / 2009 / Role of auxin and gibberellin in citrus canker development and in the transcriptional control of cell-wall remodeling genes modulated by Xanthomonas axonopodis. pv. citri / Plant Sci 177:119~190
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