Finding natural resistance from native white corn accessions against Asian corn borer (ACB)
2019
Marfori, Y.C. | Laude, T.P. | Lit, M.C. | Caoili, B.L. | Reyes, M.E.C.
One hundred nineteen native white corn accessions from different regions in the Philippines were evaluated for corn borer resistance. The study was conducted in the Institute of Plant Breeding and laid out in a Randomized Complete Block Design (RCBD) with four check varieties (IPB Var. 6, and 13; Bt hybrid and CGUARDN84 Malagkit Salt) in three replications. Preliminary quantitative detection of Cry1Ab toxin was done. Laboratory bioassays such as leaf assay (LA) and stalk feeding assay (SFA) were conducted to assess the efficacy of corn against the Asian corn borer. Plant resistance indices such as larval mortality and stalk damage at 27 DAP and 46 DAP were observed, respectively, results showed that among the native corn accessions evaluated, 41 accessions were susceptible, 76 were intermediate and only 2 native while corn were resistant. Mean larval mortality ranged from 3%-100% and mean tunnel length ranged from 3-34cm. It also revealed that Bt hybrid along with the native check (CGUARDN84) and the two native while corn accessions were resistant with highest larval mortality (100%) at 5 days after infestation. Native corn accessions with comparably high larval mortality need further evaluation on biochemical and molecular attributes for their underlying sources of natural resistance. There is also a need to utilize and improve the available native corn population for possible breeding material for Asian corn borer resistance.
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