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20221
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Subject: Genetics and Plant Breeding × Author: Ambika ×
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    ThesisItemOpen Access
    Heterosis and combining ability analysis of sub-tropical maize (Zea mays L.) inbred lines
    (Palampur, 2022-10-29) Ambika; Chand, Uttam
    The present investigation entitled “Heterosis and combining ability analysis of sub tropical maize (Zea mays L.) inbred lines” was carried out to assess the nature and magnitude of gene action, estimation of heterosis and combining ability effects for grain yield and its component traits. The experimental material consisted of 7 inbreds, 21 crosses and 3 checks viz., Palam Sankar Makka-2, Bio 9544 and Bio 605 were evaluated in RBD with two replications at Shivalik Agricultural Research and Extension Centre, Kangra during kharif, 2021. Analysis of variance revealed significant differences among genotypes except number of kernel rows per ear suggesting thereby sufficient amount of genetic variability in the experimental material. Analysis of variance for combining ability revealed significant GCA and SCA effects for most of the traits except GCA for days to 50% silking and shelling (%) indicated the preponderance of both additive and non-additive gene action for inheritance of the studied traits. The ratio of GCA variance to SCA variance was less than unity for all traits indicated preponderance of non-additive gene action. P1 (KGI-109) and P3 (DMEL-143) inbred lines were good general combiner for grain yield and may be used as parents for the development of high yielding single cross maize hybrids. The promising cross combinations viz., P1 × P4 (KGI-109 × DMEL-156), P1 × P3 (KGI-109 × DMEL-143), P2 × P3 (LM-18 × DMEL-143), P6 × P7 (DMR139 × KGI-110), P3 × P7 (DMEL-143 × KGI-110) and P2 × P5 (LM 18 × CML139) were identified on the basis of mean performance, SCA effects and significant standard heterosis for grain yield. In addition, these crosses also exhibited resistance to Turcicum leaf blight and moderate resistance to Banded leaf and sheath blight and Maydis leaf blight. These promising hybrids may be commercially exploited after evaluation in multi location trials over the years to assess their suitability in different agro-climatic zones of the state.