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Combining ability and heterosis for heat stress tolerance in maize (Zea may L.)

Author: Gazala, P.
Author: Kuchanur, P.H.
Author: Zaidi, P.H.
Author: Arunkumar, B.
Author: Patil, A.
Author: Seetharam, K.
Author: Vinayan, M.T.
Year: 2017
dc.identifier.other: http://14.139.155.167/test5/index.php/kjas/article/viewFile/8498/8754
URI: http://hdl.handle.net/10883/19188
Descriptors: Maize
Descriptors: Heat stress
Descriptors: Heterosis
Descriptors: Zea mays
Abstract: Field experiments were conducted to estimate the combining ability and heterotic effects of maize hybrids under heat stress condition during summer (mid-March to June). The s2 GCA/ s2 SCA was less than unity for all characters viz., days to 50 per cent anthesis, days to 50 per cent silking, anthesis to silking interval, tassel blast, leaf firing, plant height, ear length, ear girth, shelling %, number of kernels per cob, 100-grain weight and grain yield/plant except ear height indicating the role of non-additive gene action involved in governing these traits. The parental lines, viz., VL1051 for ASI; VL107578, VL110232, ZL134937 and VL1018816 for days to anthesis and silking recorded significant gca effects in negative direction. The parents, ZL126643 and VL1110175 recoded significant gca effects in positive direction for number of kernels per cob and grain yield. The hybrids, ZL126643 × VL1010877 and VL108868 × VL1110175 recorded significant sca effects for days to 50% anthesis in negative direction. The hybrid, VL107578 × VL1010877 recorded significant sca effect in positive direction for plant height and grain yield. The hybrids, VL1011 × VL1110175 (67.13 %), ZL126643 × VL1010877 (40.82 %) and VL126643 × VL0556 (40.21 %) recorded significant standard heterosis for grain yield per plant and VL108868 × VL1110175 (30.45%) recorded significant standard heterosis for test weight under heat stress
Abstract: Field experiments were conducted to estimate the combining ability and heterotic effects of maize hybrids under heat stress condition during summer (mid-March to June). The σ 2 GCA/ σ 2 SCA was less than unity for all characters viz., days to 50 per cent anthesis, days to 50 per cent silking, anthesis to silking interval, tassel blast, leaf firing, plant height, ear length, ear girth, shelling %, number of kernels per cob, 100-grain weight and grain yield/plant except ear height indicating the role of non-additive gene action involved in governing these traits. The parental lines, viz., VL1051 for ASI; VL107578, VL110232, ZL134937 and VL1018816 for days to anthesis and silking recorded significant gca effects in negative direction. The parents, ZL126643 and VL1110175 recoded significant gca effects in positive direction for number of kernels per cob and grain yield. The hybrids, ZL126643 × VL1010877 and VL108868 × VL1110175 recorded significant sca effects for days to 50% anthesis in negative direction. The hybrid, VL107578 × VL1010877 recorded significant sca effect in positive direction for plant height and grain yield. The hybrids, VL1011 × VL1110175 (67.13 %), ZL126643 × VL1010877 (40.82 %) and VL126643 × VL0556 (40.21 %) recorded significant standard heterosis for grain yield per plant and VL108868 × VL1110175 (30.45%) recorded significant standard heterosis for test weight under heat stress.
Language: English
Publisher: University of Agricultural Sciences
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Type: Article
Place: India
Pages: 326-333
Journal issue: 3
Journal: Journal of Farm Sciences
Journal volume: 30
Audicence: Researchers


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  • Maize
    Maize breeding, phytopathology, entomology, physiology, quality, and biotech

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