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Journal of Plant Sciences
Year: 2013  |  Volume: 8  |  Issue: 1  |  Page No.: 15 - 23

Genetic Diversity of Null Alleles of Waxy Gene in Triticum L.

Wei Li, An-Jun Liu, Yu-Zhen Sheng, Guo-Yue Cheng, Zi-En Pu, Ya-Xi Liu and Li Kong    

Abstract: In order to exploit new genetic resources for the improving of starch quality of common wheat, the genetic diversity of null alleles of Granule-bound starch synthase I (waxy gene) was investigated by special PCR molecular markers in Triticum L. The results indicated that there was relative abundant genetic diversity of waxy alleles in all accessions. Accession AS2347, AS2356, AS2317 and AS2308 with null allele at Waxy-B1 locus and AS2310 and AS2335 with null alleles at Waxy-A1 and Waxy-B1, were observed in 81 landraces of Triticum turdigum L. from China. In 53 landraces of Triticum aestivum L. from Sichuan, China, eight accessions at Waxy-A1, Waxy-B1 and Waxy-D1 loci and accession AS1668 at Waxy-D1, were observed null alleles. In 29 Triticum macha, Accession PI361862 and PI572911 at three Waxy loci, PI572913 at Waxy-B1 and Waxy-D1, PI572910 at Waxy-A1 and Waxy-D1, PI 290507 at Waxy-B1 and PI572906 at Waxy-D1, respectively, were observed null alleles. Seven accessions with null alleles at Waxy-B1 locus was observed in 28 Triticum sphaerococcum. Specially, the accessions of two regions, Anyue in Sichuan, China and Georgia, had the high frequency of the mutations with null alleles of waxy gene. Landraces of Triticum aestivum L. with the high frequency of waxy wheat, could be considered as a unique genetic resource for improving of waxy wheat. These result suggested that the special molecular marker could be used reliably in evaluation of genetic resources and these mutations also could be directly used in the improving of common wheat.

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