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KMID : 0381120110330020139
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Genes and Genomics
2011 Volume.33 No. 2 p.139 ~ p.139
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Genetic variation of Vp1 in Sichuan wheat accessions and its association with pre-harvest sprouting response
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Wang Jirui
Liu Yaxi
Wang Yan
Chen Zhenhong
Dai Shuai
Cao Wenguang
Fedak George
Lan Xiujing
Wei Yuming
Liu Dengcai
Zheng Youliang
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Abstract
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Pre-harvest sprouting (PHS) in bread wheat is a major abiotic constraint reducing yield and influencing the production of high quality grain. In China both spring and winter wheat regions are affected by PHS. Sichuan lies in southwest China, where the most of rainfall occurs during April to September when wheat is harvested. The present investigation was conducted to identify the allelic variability of Vp1, a gene that plays a role in maintenance and induction of dormancy, among Sichuan landraces and recent cultivars with different dormancy levels and to find potential sources of PHS resistance for breeding. Sichuan landrace and cultivar wheat accessions had a wide range of dormancy levels. The average germination index (GI) of Sichuan landrace accessions was 0.232, whereas at 0.674 it was much higher for cultivars. The different dormancy levels between landraces and cultivars indicated that pre-harvest sprouting resistance might have been neglected in recent Sichuan wheat breeding programs. The average GI of white grained accessions was higher than for red grained accessions. Particular Vp-1B gene fragments were specific in landraces or cultivars and in white or red grained accessions. The results indicated that Vp-1B markers could be used to distinguish cultivars and landraces. Significant relationships between certain Vp-1B allelesand GI of Sichuan wheat accessions were shown by Spearman’s rank correlation analysis.
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KEYWORD
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Pre-harvest sprouting, VIVIPAROUS-1, Triticum aestivum, Landrace, Grain color
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