Estimation of heterosis for grain yield and quality traits in sweet corn (Zea mays var. sacharata L.)
Keywords: Sweet corn, grain yield, heterosis, oil, protein, starch, sugar
AbstractThe study was carried out to estimate heterosis for yield and biochemical quality traits in sweet corn (Zea mays var. sacharata) crosses. Forty five hybrids using diallel mating design excluding reciprocals were generated. These hybrids along with their ten parents and one standard check (Madhuri) were grown at IARI, New Delhi during kharif-2008 in randomized block design (RBD). Estimation of heterosis over standard check (HSC) ‘Madhuri’, mid-parent (HMP), and better parent (HBP) was calculated. The significant heterosis over standard check for grain yield was found in five crosses, and for sugar content in twelve crosses out of forty five. The HMP for grain yield was found in eighteen crosses and for sugar content in nine crosses. The HMP for grain yield and sugar content was found in IPSA-6134 × IPSA-6141, IPSA-6135 × IPSA-6136, and IPSA-6141 × IPSA-6142. One cross IPSA-6137 × IPSA-6139 showed HMP for protein content and grain yield. One cross IPSA-6136 × IPSA-6139 showed HMP for sugar content and protein content. The HBP was observed in IPSA-6135 × IPSA-6136, IPSA-6136 × IPSA-6139, IPSA-6138 × IPSA-6141, IPSA-6139 × IPSA-6140 and IPSA-6140 × IPSA-6141 for sugar content and IPSA-6134 × IPSA-6137, IPSA-6134 × IPSA-6141, IPSA-6134 × IPSA-6142, IPSA-6135 × IPSA-6139, IPSA-6140 × IPSA-6142, and IPSA-6141 × IPSA-6142 for grain yield. Two crosses IPSA-6135 × IPSA-6136 and IPSA-6141 × IPSA-6142 have the HBP for grain yield and sugar content. One cross IPSA 6137 × IPSA 6139 showed the HBP for protein and grain yield.
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