Abstract
Key message
Leaf patterns (yellow, green and striped) of Clivia miniata var. variegata might be caused by differential DNA methylation in CCGG sites in response to heterogeneous environmental pressure.
Abstract
Clivia miniata is an important ornamental plant. Clivia miniata var. variegata (Cmvv) is a variegated leaf mutant of C. miniata. Typical Cmvv has attractive green- and yellow-stripped leaves. The study has revealed that an explant of Cmvv, even a full-green explant, could regenerate plants of three different types: yellow, green, and striped; normal-appearing chloroplasts were found in guard cells but not in mesophyll cells of all the three types of Cmvv using confocal laser scanning microscopy (CLSM). Thus, we speculated that cells of the three types of Cmvv had an identical mutation and the mutation might disturb mesophyll cell chloroplast biogenesis after symplastic isolation of guard cells. Using CLSM and methylation-sensitive amplification polymorphism (MSAP), we found that (a) striped leaves of Cmvv are due to sectorial decreases in chlorophyll levels and the decreases are associated with CG hypermethylation; (b) extent of epigenetic divergence among the three types of Cmvv leaves is positively correlated with intensity of leaf-color difference; and (c) green stripes of two plants are clustered in one group based on the MSAP profiles, but green and yellow stripes of a plant are not. Sequencing analysis indicated that CG hypermethylation in gene bodies of CPSAR1 and ycf2 might lead to gene silencing and yellow leaves/stripes of Cmvv. All together, it is possible that cytosine methylation involved regulating leaf color of Cmvv, also striped pattern of Cmvv might be caused by differential DNA methylation in response to heterogeneous environmental pressure. Furthermore, a novel leaf-color epigenetic hypothesis was proposed in this article.
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Abbreviations
- Cmvv :
-
Clivia miniata var. Variegata
- MSAP:
-
Methylation-sensitive amplification polymorphism
- MZEs:
-
Mature zygotic embryos
- MS:
-
Murashige and Skoog
- KT:
-
Kinetin
- NAA:
-
a-Naphthaleneacetic acid
- BA:
-
6-Benzyladenine
- 2,4-D:
-
2,4-Dichlorophenoxyacetic acid
- IM:
-
Initiation media
- IM1 :
-
Initiation media supplemented with BA 1.11 μM + NAA 5.37 μM + 2,4-D 2.26 μM
- IM2 :
-
Initiation media supplemented with BA 2.22 μM + NAA 5.37 μM + 2,4-D 1.13 μM
- RM:
-
Regeneration media
- RM1 :
-
Regeneration media containing KT 9.29 μM + NAA 2.69 μM
- RM2 :
-
Regeneration media containing KT 9.29 μM + 5.37 μM
- CLSM:
-
Confocal laser scanning microscopy
- YP:
-
Expanding yellow leaves in young group
- GP:
-
Expanding green leaves in young group
- SP:
-
Expanding striped leaves in young group
- YP2 :
-
Expanded yellow leaves in mature group
- GP2 :
-
Expanded green leaves in mature group
- SP2 :
-
Expanded striped leaves in mature group
- YS1–3 :
-
Yellow stripes of expanded striped leaves in reference group
- GS1–3 :
-
Green stripes of expanded striped leaves in reference group
- PAGE:
-
Polyacrylamide gel electrophoresis
- CE:
-
Capillary electrophoresis
- PGRs:
-
Plant growth regulators
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Acknowledgments
This work was supported by China Postdoctoral Science Foundation (2015M571330), Scientific Research Fund of Liaoning Provincial Education Department (L2015487) and Shengyang Agricultural University Scientific Research Fund of Young Teacher (20131002). Professor Bao Liu (Laboratory of Plant Molecular Epigenetics, Institute of Genetics and Cytology, Northeast Normal University, China) kindly provided the facilities for MSAP analysis.
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Wang, QM., Wang, L., Zhou, Y. et al. Leaf patterning of Clivia miniata var. variegata is associated with differential DNA methylation. Plant Cell Rep 35, 167–184 (2016). https://doi.org/10.1007/s00299-015-1877-7
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DOI: https://doi.org/10.1007/s00299-015-1877-7