Maize (Zea mays L.) cyclical populations response over diverse environments - developed via recurrent selection


The recurrent selection currently exists as a cyclical breeding technique that has been widely used for improvement
in maize (Zea mays L.). In Pakistan maize crop is mainly grown in two seasons i.e., spring (sown during
February 10 to March 10) and summer (sown during June 20 to July 20). Maize base population 'PSEV3' was developed
through selfed progeny recurrent selection for three years in five consecutive crop seasons (during spring
and summer - 2014 and 2015, and spring - 2016). During Summer 2017, the present study was aimed to assess
the mean performance of maize improved populations C1 (based on S1 lines) and C2 (based on S2 lines) developed
through selfed progeny recurrent selection, in comparison to base population (PSEV3-C0) and check genotypes
(cultivars Azam and Jalal, and hybrid Kiramat) for earliness and yield traits across four environments (two each
location and planting time). Genotypes, locations, and planting times exhibited significant (p≤0.01) differences for
the majority of the traits. However, genotype by location, genotype by planting time, and genotype by location
by planting time interactions were nonsignificant for most of the variables. By comparing with base population
and check genotypes, the improved maize populations [PSEV3 (S1)-C1 and PSEV3 (S2)-C2] showed the best performance
by having early maturity with increased grain yield across the locations and planting times. However, the
C2 population was leading, followed by C1 as compared to the original population (C0) and check genotypes for
the majority of the traits. Overall, the selfed progeny recurrent selection was found effective in improving maize
base population 'PSEV3' for maturity and yield related traits.


Recurrent selection, Base population (C0), Cyclical populations (C1, C2), Genotype by environment interaction (GEI), Earliness and yield traits, Zea mays L.

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Maydica - A journal devoted to maize and allied species

ISSN: 2279-8013