Towards durable Ascochyta blight resistance in chickpea: understanding of the genetics and resistance mechanisms
2001
Galvez, H.F. (The Univ. of Melbourne, Victoria 3010 (Australia). Molecular Plant Genetics and Germplasm Development Group) Ford, R. | Pang, E.C.K. | Brouwer, J.B. | Taylor, P.W.J.
Ascochyta blight, caused by Ascochyta rabiei (Pass.) Lab., is the most destructive foliar disease of chickpea worldwide. In Australia, the disease has recently caused large crop losses which has resulted in considerable reduction of land area grown to chickpea. With strong evidence of polygenic control, breeding has been geared towards gene pyramiding. However, the lack of knowledge on the genetics and mechanism of resistance impedes the breeding progress. This study then is the first successful attempt to answer the questions underlying the genetic complexity of ascochyta blight (AB) resistance in chickpea. Using the resistant lines developed at the Victorian Intitute for Dryland Agriculture (VIDA), Horsham, Victoria, the resistance mechanism of chickpea to AB at different plant developmental stages was elucidated. Stem and leaf resistances were partitioned and quantitative screening parameters were established for both intact and detached plant tissue bioassays. Chickpea lines with a high degree of seedling and/or maturity resistance were identified and mapping populations were developed for each resistance mechanism. The genetics of AB resistance is then being inferred in the progenies. The implication of the results of the study in QTL mapping and subsequent gene pyramiding for durable ascochyta blight resistance in chickpea will be thoroughly discussed
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