Isolation of resistance gene analogues to powdery mildew resistance sequences in hexaploid wheat |
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| Authors: | D S Feng X Ma A L Lin H G Wang and J C Tian |
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| Institution: | (1) Plant Molecular Biology Department, Institute of Plant Biology, University of Z?rich, Zollikerstr. 107, 8008 Z?rich, Switzerland;(2) Present address: Department of Botany and Plant Sciences, University of California, Riverside, 2150 Batchelor Hall, Riverside, CA 92521-0124, USA;(3) Present address: Ubon Ratchathani Rice Research Center, P.O. Box 65, Muang District, 34000 Ubon Ratchathani, Thailand; |
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| Abstract: | This paper reports the characterization of the powdery mildew resistance homologous genes family of Triticum aestivum. Using degenerate primer pair for wheat resistance genes, we have cloned seven 3′ truncated powdery mildew resistance gene
homologous fragments Tpc5a, Tp25a, Tp25b, Tp3a5a, Tp3a5b, Tp4b5a and Tp4b5b. These fragments were sequenced. The deduced amino acid sequences showed that six of them have premature stop codons. All
these sequences had a very high level of similarity to known Pm resistance genes such as Pm3a, Pm3b, Pm3d and pm3f in hexaploid wheat. By ignoring the stop codons in the sequences, their deduced protein sequences were of coiled-coil (CC)-nucleotide
binding site (NBS)-leucine repeat rich (LRR) structure. These results suggest that there are many powdery mildew resistance
gene analogues in both resistant and susceptible wheat. Among them, small insertion/deletion events and point mutations can
result in the diversity of wheat Pm resistance homologous genes. |
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