EFFECT OF LWD RESISTANCE IN THE SEED PARENT ON GRAIN YIELD AND LWD RESPONSE OF MAIZE (Zea mays L.) HYBRID NAH-1137 (HEMA)
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Date
2022-12-22
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University of Agricultural Sciences, Bangalore
Abstract
The low productivity of maize in Karnataka is attributed to various biotic and abiotic constraints. The biotic constraints, of which, Late Wilt Disease (LWD) caused by, Harpophora maydis is a destructive disease, causing yield losses ranging from 10.18 to 31.08%. Hence, development and deployment of LWD resistant cultivars is regarded as cost-effective and environmentally friendly strategy to reduce losses due to LWD. 11 Marker assisted selection (MAS) derived LWD resistant versions of NAI-137 and NAI- 137, Hybrid combination of these LWD resistant versions of NAI-137 with MAI-105 and ‘Hema’ were evaluated at University of Agricultural Sciences, GKVK, Bangalore to compare grain yield potential of LWD susceptible seed parent of UASB-bred maize hybrid ‘Hema’ with its MAS-derived LWD resistant versions and to identify variants of ‘Hema’ with grain yield at least comparable to ‘Hema’ coupled with higher levels of LWD resistance. In the present study the six seed parents160-2, 66-4, 84-2, 144-4, 88-1 and 146- 1 were found significantly better yielder than NAI-137 and Six hybrids namely, 66-4 × MAI-105, 84-2 × MAI-105, 102-1 × MAI-105, 144-4 × MAI-105, 88-1 × MAI-105 and 145-1 × MAI-105 significantly better yielder than ‘Hema’ hybrid. And five hybrids namely 66-4 × MAI-105, 84-2 × MAI-105, 144-4 × MAI-105, 88-1 × MAI-105 and 145-1 × MAI- 105 were found high yielding coupled with tolerance to LWD. These five hybrids are suggested for large scale evaluation for grain yield and LWD tolerance for confirmation.