Abstract
In many ornamental plants, anthocyanin accumulation in leaves is a critical determinant of foliage coloration. However, the mechanism by which photoperiod and shading affect coloration and anthocyanin accumulation in the leaves of woody plants is less clear. By examining the leaves and calli of crabapple (Malus spp.) cultivars with different leaf color characteristics, we analyzed the foliage coloration, flavonoid contents, and expression levels of anthocyanin biosynthetic genes and the McMYB10 transcription factor under different photoperiods and shading treatments. The red color parameters, flavonoid contents, and expression levels of some anthocyanin-related genes in both the leaf and callus were generally higher under sun-exposure or long-day treatments compared to shading or short-day treatments. These data indicate that red color formation in cultivars with leaves that are naturally red requires a suitable photoperiod and light intensity; high light intensity or long-day conditions activate anthocyanin biosynthesis-related genes, leading to anthocyanin accumulation. Our results also indicate that the regulation of anthocyanin biosynthetic metabolism in response to light conditions differs between red-leafed and green-leafed cultivars. Taken together, our data reveal that photoperiod and light intensity are important in the regulation of pigmentation and anthocyanin accumulation in crabapple leaves and calli. Moreover, we provide a useful approach for studying and inducing the production of flavonoids by crabapple callus culture under certain photoperiods.
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Abbreviations
- PAL:
-
Phenylalanine ammonia lyase
- CHS:
-
Chalcone synthase
- CHI:
-
Chalcone isomerase
- F3H:
-
Flavanone 3β-hydroxylase
- F3′H:
-
Flavonoid 3′-monooxygenase
- DFR:
-
Dihydroflavonol 4-reductase
- ANS:
-
Anthocyanidin synthase
- UFGT:
-
Uridine diphosphate (UDP)-glucoseflavonoid 3-O-glycosyltransferase
- FLS:
-
Flavonol synthase
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Acknowledgments
We thank the Fruit Tree Key Laboratory at the Beijing University of Agriculture (BUA) for providing basic laboratory equipments. We are grateful to all of the technicians at the BUA Crabapple Germplasm Resource Garden. Financial support was provided by the National Natural Science Foundation of China (Nos. 31071785 and 31200213), the Funding Project for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality (PHR20110515), and the Scientific Research Foundation for Selected Overseas Chinese Scholars, Beijing Human Resources and Social Security Bureau.
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Yanfen Lu, Meiling Zhang and Xiaona Meng have contributed equally to this work.
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Lu, Y., Zhang, M., Meng, X. et al. Photoperiod and shading regulate coloration and anthocyanin accumulation in the leaves of malus crabapples. Plant Cell Tiss Organ Cult 121, 619–632 (2015). https://doi.org/10.1007/s11240-015-0733-3
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DOI: https://doi.org/10.1007/s11240-015-0733-3