STUDIES ON HOST RANGE OF SORGHUM DOWNY MILDEW OF MAIZE CAUSED BY Peronosclerospora sorghi (Weston and Uppal) Shaw AND SCREENING OF GENOTYPES FOR RESISTANCE
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Date
2009-07-12
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Maize (Zea mays L.) bas been known 10 be affected by as maoy as six differen1 species of downy mildew fungi. Among lhem Pero11osclerospora sorghi which causes downy mildew was the mos1 predcminanl one aod bas r<SU11ed in subslaotial eccnomic losses.
Thirty four plant species belonging to cereals, legumes and grasses wcte leslcd to know the host range of sorghum downy mildew. Only two viz .. fodder maize (African Tall) (&0.5%) and sorghum (60%) were found to be infec1ed by tbe pathogen and thus these may act as hos1s and remaining planl species were complelely free from infection indicating that Ibey were non hosts. Large nurobct of genotypes belonged 10 different maturil)' groups were screened for sorghum downy mildew which revealed tbal genotypes Euro-I 202, MCH-35, CP-828, Euro-1201, MOl-825, PAC-740 and SMH-3904 were found resistant. tlB-Shakthi and
PR0-372 were found to be moder:uely resistanl to the disease
Four inbred lines viz., NAl-112, NAl-116, NAl-124 and NAl-137 ou1 of twenl)' four lines developed at Nagenahally, were found to be resislanl
Among twenl)' six Maodya maize inbred lines, MAl-15, MAl-19, MAI-22, MAl-29 and MAl-50 were fOUDd resisumt. While four inbred lines l'iz., MAl-12, MAl-26 MAl-41 and MAl-45 were fOUDd moderaloly ,esilllllll
Among seven"""' single c,oss bylJrids, only ... ...,. • ._, CM-14S X NAl-147 was modctately resislaot. Whae as mnong lbe pri- -aize hybrids ICleeued b die
disease resist&DCC, oaly one hybrid L-4999 WU 111ue-t • .. dil e 11c Molecular cbuacterizalioD of eoqlnn dowDy !Cw .esi- IDd SOICCpb"ble genotypes was dooe using SSR .,.._ Nwl ID wq! • do....y mildew resiSlaace. Among five SSR marten lellllld, GIiiy.... all a-. WIM'241 IDd plli078 were consistent in exhibiting polymorphism among susceptible and resistant lines. Whereas, other two markers bngl 1702 and nco13 showed amplification but the banding pattern was not consistent with the reaction to the disease.
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