Yield evaluation of IPB Var 6 half-sib families towards improvement for water stress tolerance
2018
Ocampo, E.T.M. | Sanchez, Ma.A.B. | Heredia, M.C.C. | Adorada, P.J.R. | Beltran, A.K.M.
IPB Var 6 is a white quality maize protein open-pollinated variety that can be processed to corn grits that are highly acceptable for food. However, this variety is low yielding under water stress conditions thus population improvement through recurrent selection can be done to improve this variety. Eighty half-sib families from improved IPB Var 6 (Cycle 2) for double stress tolerance were generated and evaluated for yield and other agronomic traits during dry season of 2017. This is in continuance of the population improvement of this variety to withstand both abiotic stress conditions. Experiment was laid-out in a randomized complete block design with two replications in a single environment. After statistical analysis, 20% half-sibs were selected for recombination. Based on the analysis of variance, the coefficient of variation for yield is 19.37% and while there is no significant variation among the half-sib evaluated, the mean yield is 1.06 tons/ha. The 16 half-sib families selected had a grain yield of 1.16 to 1.46 ton/ha while the tolerant check had an average yield of 1.21 tons/ha. Further activities include recombination of the half-sib families to constitute an improved variety and extensive field testing to increase favorable alleles for double stress tolerance if IPB Var 6.
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