Abstract
Apple is considered the most commonly grown fruit crop in temperate regions that brings great economic profits to fruit growers. Dwarfing rootstocks have been extensively used in apple breeding as well as commercial orchards, but the molecular and genetic basis of scion dwarfing and other morphological traits induced by them is still unclear. At present, we report a genetic map of Malusdomestica × Malus baccata with high density. The F1 population was sequenced by a specific length amplified fragment (SLAF). In the genetic map, 5064 SLAF markers spanning 17 linkage groups (LG) were included. Dwarf-related and other phenotypic traits of the scion were evaluated over a 3-year growth period. Based on quantitative trait loci (QTL) evaluation of plant height and trunk diameter, two QTL clusters were found on LG 11, which exhibited remarkable influences on dwarfing of the scion. In this analysis, QTL DW2, which was previously reported as a locus that controls dwarfing, was confirmed. Moreover, three novel QTLs for total flower number and branching flower number were detected on LG2 and LG4, exhibited the phenotypic variation that has been explained by QTL ranging from 8.80% to 34.80%. The findings of the present study are helpful to find scion dwarfing and other phenotypes induced by rootstock in the apple.
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Abbreviations
- SLAF:
-
Specific length amplified fragment
- PH:
-
Plant height
- TD:
-
Trunk diameter
- TF:
-
Total flower number
- IM:
-
Interval mapping
- LG:
-
Linkage groups
- QTL:
-
Quantitative trait loci
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Acknowledgements
The authors wish to thank Dr. Md Ashraful for supplying revision kindly.
Funding
This study specializing in “Construction of Jinzhong Comprehensive Test Station of National Apple Industry Technology System” (CARS-27) has been supported by China Agriculture Research System of MOF and MARA; The Agricultural Science and Technology Innovation Research Project of Shanxi Academy of Agricultural Sciences "Study on the Mechanism of Dwarf, Early Flowering and Regulation of Branch Amount of Grafted Varieties by Apple Rootstocks" (YCX2018D2YS17).
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TZ Yang planned and designed the research.HC Cai collected the plant materials, performed the experiment, analyzed the data, interpreted results, and wrote the manuscript. Q Wang and JD Gao contributed to sample data collection. CY Li analyzed the part of data. XM Du and BP Ding provided suggestions in drafting the manuscript and edited the manuscript. All the authors have read and approved the final manuscript.
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Cai, H., Wang, Q., Gao, J. et al. Construction of a high-density genetic linkage map and QTL analysis of morphological traits in an F1 Malusdomestica × Malus baccata hybrid. Physiol Mol Biol Plants 27, 1997–2007 (2021). https://doi.org/10.1007/s12298-021-01069-0
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DOI: https://doi.org/10.1007/s12298-021-01069-0