Assessment of maintenance breeding methods in maize (Zea mays L.)


An investigation was conducted at IASc. BHU, Varanasi (Rabi 2014-15 to Kharif 2017) with four maize inbreds using three maintenance methods (selfing, half-sibbing and full-sibbing) for four generations in which a significant amount of genetic correlation was found between the morphological and molecular analyses. The comparison of
four inbreds revealed a deviation in the clustering pattern after the four generations of maintenance. A maximum similarity coefficient was recorded between HKI 193-1 FS and LM 10 FS lines; full-sibbing showed the highest similarity between the first and fourth generation. Most of the inbreds followed a similar clustering pattern in morphological as well as in molecular diversity analyses. HKI 1105 is considered as most stable inbred in terms of giving a wide range of partitioning the regression coefficient. The quadratic and cubic trend through the graphical method showed self-ingled to a negative [cb1] response as well as maximum changes whereas, the full-sibbing
method recorded with the minimum changes over the generations. Comparison of the combining ability of the inbreds by three methods revealed that CML-161 followed by HKI 1105 recorded maximum and LM 10 recorded minimum significant GCA effects. Through all the experiments it was proved that selfing caused the highest loss
of vigour whereas full-sibbing was most stable.


Combining ability, diversity, hybrid, inbred maintenance, inbreeding depression, variability

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Maydica - A journal devoted to maize and allied species

ISSN: 2279-8013