Common bean disease improvement using QTL mapping

Common bean, the largest consumed bean has 25% protein content along with minerals like Cu, Fe, Ca, Zn, Mg, and vitamins. It is affected by over 200 diseases. In this book chapter, we have covered the most widespread diseases like fungal, bacterial, viral, and insect-related diseases. Different types of markers such as AFLP, RAPD, RFLP, SSR, and SNP have been used to build the linkage map for several resistance genes in common bean. QTL linked to different diseases has been identified from different mapping population like NIL, RIL, BC, DH, multiconnected biparental population using sequencing, and PCR-based genotyping approaches. Recent advances in QTL mapping have been studied more to identify the QTL linked to fungal diseases compared with other diseases. The gap between identification of disease tolerance genes and the breeding of disease-resistant common bean varieties requires the fine mapping of stable QTLs and finding the genes related to disease tolerance is highly relevant. These QTLs are very helpful for common bean breeding studies against disease (biotic) improvement.