Genetic Analysis of Heat Adaptive Traits in Tropical Maize (Zea mays L.)

Jodage, Krishnaji; Kuchanur, P. H.; Zaidi, P.H.; Patil, Ayyanagouda; Seetharam, K.; Vinayan, M.T.; Arunkumar, B.

doi:10.20546/ijcmas.2018.701.387

Cited by 5 publications

(8 citation statements)

References 11 publications

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“…The cross CML-171 × CML-161 recorded the highest negative significant economic heterosis for plant height in spring. It can be exploited further in breeding programmes for developing small and medium-stature varieties in maize crops.Amirruzzaman et al (2018),Kumari et al (2019),Aminu et al (2017),Darshan and Marker (2019) andSolomon et al (2020) reported similar results for these traits Das et al(2017),Ejigu et al(2017),Gazal et al (2017),Krishnaji et al(2018). andManoj et al(2018).Considering the relevance of better fitness, negative estimates of inbreeding depression for days to 50%https://doi.org/10.37992/2022.1304.165 Rama Vamsi et al,…”

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confidence: 74%

Studies of heterosis and inbreeding depression on maize (Zea mays L.)

2022

EJPB

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A study was undertaken to investigate the heterosis and inbreeding depression in 21 hybrids (F 1 ) and their F 2s produced by crossing seven maize inbreeds in all possible combinations, excluding reciprocal. . The crosses VL-1016556 × CML-171 and VL-1016556 × KL-153237 were identified as the best F 1 s as they showed superiority for grain yield per plant over the check. The highest heterobeltiosis (Hb) was recorded by hybrids VL-1016556 × KL-153237 and VL-1016556 × CML-171 while hybrids VL-1016556 × KL-153237 and VL-1016556 × CML-171 exhibited the highest economic heterosis (Hc). Keeping the greater magnitude of heterosis, high mean performance and lesser inbreeding depression (less than 15%) into consideration, five crosses, namely, VL-1016556 × BHU-N5, VL-1016556 × CML-171, VL-1016556 × CML-161, CML-171 × BHU-N5 and VL-1016556 × BHU QPM-3 were identified as best hybrids.

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confidence: 74%

Studies of heterosis and inbreeding depression on maize (Zea mays L.)

2022

EJPB

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“…Previous authors results, have contradicted on the type of gene action conditioning heat stress with regards to vigour of seed, curling (rolling of leaf), leaf senescence, CCI, plant height, 100grain weight, yield and biomass. While some have attributed to non-additive gene action as important, others have attributed it to both additive and non-additive effect [28,29,30]. The differences observed could be attributed to different germplasm used and type of environment under study.…”

Section: Fig 1 Principle Component Analysis Exhibiting Genotypes Inmentioning

confidence: 99%

Nature of Inheritance to Heat Stress and Selection of Inherent Genotypes in Tropical Maize

Mwanza¹,

Mataa

Tembo

2020

AJRCS

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Maize is an important cereal in sub-Saharan Africa. Its production is however hampered by both biotic and abiotic factors. Among the abiotic factors, heat stress has been reported to cause yield losses. The objective of this study was therefore to identify tolerant genotypes to heat stress and determine the type of gene action conditioning heat tolerance in tropical maize. To achieve these objectives, five maize inbred lines (L2 [P1]; DTS 6,36 [P2]; L5527 [P3]; DTS 6,6 [P4] and DTS 6,92 [P5]) were mated in a 5 x 5 half diallel. Their progeny were evaluated at a heat prone site (Lusitu) and at the University of Zambia (UNZA), a control site. The experiment was laid as a randomised complete block design with two replications in each site. Highly significant differences (P ≤ 0.01) were obtained among genotypes in Lusitu with regards to all measured parameters. The crosses[P2 (DTS 6,36) x P4 (DTS 6,6)] and [P4 (DTS 6,6) x P5 (DTS 6,92)]were identified as tolerant genotypes to heat stress. Further analysis showed that the general combining ability (GCA) effects for parent P4 (DTS 6, 6) and P3 (L5527) were positively and negatively significantly different (P ≤ 0.01) from zero respectively with regards to all measured parameters. On the other hand, crosses [P1 (L2) x P3 (L5527)] & [P4 (DTS 6,6) x P5 (DTS 6,92)]were found to possess desirable significant (P ≤ 0.05) specific combining ability (SCA)effects from zero. The results of baker’s ratio obtained for responseto heat stress for all secondary traits measured were found to be greater than 0.88. This implied that additive gene action was more important in conditioning the response of these traits to heat tolerance.

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“…Moreover, maize grain yield losses of up to 42% and 70% due to heat stress were reported by Khodarahmpour et al and Badu-Apraka et al [4,5], respectively. Climate projections show that heat stress frequency, duration, and severity is increasing and that a temperature rise of 0.3 • C is expected to reach approximately 1 • C above the present value by the year 2025 [6,7], and this will cause a decline in global maize grain yield potential by 45% [8]. Hence, acceleration of breeding for heat stress tolerance became a priority objective in maize breeding to ensure food security under these predicted climatic scenarios [9].…”

Section: Introductionmentioning

confidence: 99%

“…It is, therefore, imperative to develop and release maize cultivars that are tolerant to heat stress. On the other hand, literature pertaining to gene action controlling important traits in maize under heat stress is limited [13][14][15], and this warrants considerable attention. In order to start an appropriate heat stress tolerance breeding program, it is essential to have knowledge on genetic diversity for heat tolerance, gene action, and inheritance of the traits of interest [16].…”

Section: Introductionmentioning

confidence: 99%

“…Combining ability for heat tolerance in maize was studied by several researchers, and both additive and non-additive gene action were reported on the expression of grain yield, anthesis-silking interval, leaf firing, tassel blasting, and anthesis dates [15,21,22]. Studies conducted by Jodage et al and Chapman et al [15,21] showed that additive genetic effects play a major role in conditioning grain yield under heat stress conditions in tropical maize. However, some researchers reported contrasting genetic effects for grain yield under heat stress conditions [14].…”

Section: Introductionmentioning

confidence: 99%

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Genetic Potential of Tropically Adapted Exotic Maize (Zea mays L.) Heat-Tolerant Donor Lines in Sub-Tropical Breeding Programs

Mukaro

Kamutando

Magorokosho³

et al. 2023

Agronomy

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Breeding for heat stress tolerance became a priority in sub-Saharan Africa (SSA), as projections are showing an increase in frequency, duration, and severity. In this study, 14 heat stress tolerant-donor lines (HSTDLs) sourced from CIMMYT-India (males) were crossed with 15 locally adapted elite lines (females) developed within the CIMMYT-Zimbabwe maize-breeding program using the North Carolina Design II mating scheme. The resultant 175 single crosses were evaluated alongside five commercial hybrids and adjacent to the trial of parental lines used in the crosses across two locations representing heat stress and optimal environments in Zimbabwe. The design II analysis showed significant (p < 0.01) general combining ability (GCA) effects for exotic heat donor lines and specific combining ability (SCA) effects on grain yield under heat stress, optimal conditions, and across locations; demonstrating additive and non-additive genetic inheritance of grain yield. High Baker’s ratios observed in this study indicate predominance of additive over non-additive gene effects. Three exotic HSTDLs, namely CAL14138, CAL152, and CAL1440, exhibited significant (p < 0.001) and positive GCA effects under heat stress conditions. The results imply that these exotic lines could serve as valuable genetic resources for introgression of heat tolerant alleles into local maize populations for accelerated yield genetic gains. Single crosses, DJ265-15 × VL1018816 and DJ267-9 × CAL1440, exhibited positive and significant (p < 0.01) and (p < 0.05) SCA effects for grain yield under heat stress conditions, respectively. These crosses can be used for further breeding and can contribute to grain yield performance under heat stress conditions. The exotic HSTDLs, CAL14138, CAL152, and VL109126 showed superior per se performance under heat, optimal conditions, and across environments. Overall data demonstrate the potential of exotic HSTDLs for improving the adaptation of maize to heat stress in sub-tropical breeding programs.

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Genetic Analysis of Heat Adaptive Traits in Tropical Maize (Zea mays L.)

Cited by 5 publications

References 11 publications

Studies of heterosis and inbreeding depression on maize (Zea mays L.)

Studies of heterosis and inbreeding depression on maize (Zea mays L.)

Nature of Inheritance to Heat Stress and Selection of Inherent Genotypes in Tropical Maize

Genetic Potential of Tropically Adapted Exotic Maize (Zea mays L.) Heat-Tolerant Donor Lines in Sub-Tropical Breeding Programs

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