Identification of quantitative trait loci associated with resistance to foliar diseases in sorghum [<Emphasis Type="Italic">Sorghum bicolor</Emphasis> (L.) Moench] |
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| Authors: | S Murali Mohan R Madhusudhana K Mathur D V N Chakravarthi Sanjay Rathore R Nagaraja Reddy K Satish G Srinivas N Sarada Mani N Seetharama |
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| Institution: | (1) Directorate of Sorghum Research, Rajedranagar, Hyderabad, Andhra Pradesh, India;(2) MPUAT, Udaipur, Rajasthan, 313 001, India;(3) Andhra University, Visakhapatnam, Andhra Pradesh, India; |
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| Abstract: | Forage sorghum cultivars grown in India are susceptible to various foliar diseases, of which anthracnose, rust, zonate leaf
spot, drechslera leaf blight and target leaf spot cause severe damage. We report here the quantitative trait loci (QTLs) conferring
resistance to these foliar diseases. QTL analysis was undertaken using 168 F7 recombinant inbred lines (RILs) of a cross between a female parental line 296B (resistant) and a germplasm accession IS18551
(susceptible). RILs and parents were evaluated in replicated field trials in two environments. A total of twelve QTLs for
five foliar diseases on three sorghum linkage groups (SBI-03, SBI-04 and SBI-06) were detected, accounting for 6.9–44.9% phenotypic
variance. The morphological marker Plant color (Plcor) was associated with most of the QTL across years and locations. The QTL information generated in this study will aid in
the transfer of foliar disease resistance into elite susceptible sorghum breeding lines through marker-assisted selection. |
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