Abstract
With increasing consumer demand for vegetables, edible-podded peas have become more popular. Stringlessness is one of most important traits for snap peas. A single recessive gene, sin-2, controls this trait. Because pollen carrying the stringless gene is less competitive than pollen carrying the stringy gene, there are fewer than expected stringless plants recovered in segregating generations. Marker-assisted selection (MAS) is a valuable tool to identify plants with the traits of interest at an early stage in the breeding process. The objective of this study was to identify robust, user-friendly molecular markers tightly linked to sin-2. A total of 144 target region amplification polymorphism (TRAP) primer combinations were used to screen four DNA bulks, which were constructed from 32 pea breeding lines based on their phenotypes. Sixty polymorphic TRAP primer combinations were identified between bulks of stringless and stringy pods. Five primer combinations, F6_Trap03_168, F6_SA12_145, F10_ODD8_130, F11_GA5_850, and F12_SA12_190, showed more than 90 % association with the stringless phenotype in 32 pea breeding lines. Two of the TRAP markers, F10_ODD8_130 and F12_SA12_190, were cloned, sequenced, and successfully converted to sequence characterized amplified region (SCAR) markers. These two SCAR markers were validated using 20 F5 recombinant inbred lines derived from a cross between Bohatyr (a dry pea variety with strings) and S1188 (a stringless snap pea variety) and showed strong marker-trait association. The results will have direct application in MAS of stringless edible-podded peas.
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Acknowledgments
The authors gratefully acknowledge the funding sources: USDA-ARS CRIS Projects #2090-21000-028-00D (JH, CJC) and 2090-21000-024-00D (RJM). Liangsheng Xu and Lisa Taylor are greatly acknowledged for their technical assistance. Also, thanks for the support from Washington State University.
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Online Resource 1
Characteristics of 32 pea breeding lines and corresponding genotypes of the five TRAP markers (F6_Trap03_168, F6_SA12_145, F10_ODD8_130, F11_GA5_850 and F12_SA12_190) and the two SCAR markers (SC_F10_ODD8_130 and SC_F12_SA12_190) (DOCX 15 kb)
Online Resource 2
Characteristics of 20 RIL individuals and corresponding genotypes of the five TRAP markers (F6_Trap03_168, F6_SA12_145, F10_ODD8_130, F11_GA5_850 and F12_SA12_190) and the two SCAR markers (SC_F10_ODD8_130 and SC_F12_SA12_190) (DOCX 13 kb)
Online Resource 2
A The string is absent in pod sutures of stringless pea individual. B There is no string in the ventral suture when breaking it apart by hand. C The strings are present in pod sutures of stringy pea individuals. D There are strings in the ventral sutures when breaking them apart by hand. (PPTX 1004 kb)
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Ma, Y., Hu, J., Myers, J.R. et al. Development of SCAR markers linked to sin-2, the stringless pod trait in pea (Pisum sativum L.). Mol Breeding 36, 105 (2016). https://doi.org/10.1007/s11032-016-0525-4
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DOI: https://doi.org/10.1007/s11032-016-0525-4