Generation Mean Analysis Reveals the Predominant Gene Effects for Grain Iron and Zinc Contents in Pearl Millet

Pujar, Mahesh; Govindaraj, Mahalingam; Gangaprasad, S.; Kanatti, Anand; Gowda, T. H.; Kumar, B. Mohan; Satish, Kumar

doi:10.3389/fpls.2021.693680

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…For grain Fe and Zn concentration, the relatively high proportions of GCA over SCA, the high ratio of additive and dominance variance, and the predictability ratio close to unity (0.97 for iron and 0.93 for zinc) suggest that these traits are predominantly under the control of additive gene action. This is in line with previous studies that reported these traits being under additive gene action in pearl millet (Velu, 2006;Rai et al, 2007;Govindaraj et al, 2013;Kanatti et al, 2014;Kanatti et al, 2016;Pujar et al, 2022). With respect to the agronomic traits, flowering time, plant height, panicle length, panicle girth, panicle compactness, and downy mildew incidence had a high predictability ratio, implying that these traits are under additive genetic control.…”

Section: Estimates Of Variance and Genetic Variance Componentssupporting

confidence: 90%

Combining ability studies of grain Fe and Zn contents of pearl millet (Pennisetum glaucum L.) in West Africa

Gaoh

Gangashetty

Mohammed³

et al. 2023

Front. Plant Sci.

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Micronutrient malnutrition is a major challenge in Africa, where half a million children die each year because of lack of micronutrients in their food. Pearl millet is an important food and fodder crop for the people living in the Semi-Arid regions of West Africa. The present study was conducted to determine the stability, combining ability, and gene action conditions of the high level of Fe and Zn content in grain and selected agronomic traits. Hence, eight genotypes were selected based on the availability of grain Fe and Zn contents and crossed in a full diallel mating design. Progenies from an 8 × 8 diallel mating along with the parents were evaluated in an alpha lattice design with three replications in three locations for two years. The parental lines Jirani, LCIC 9702 and MORO, had positive significant general combining ability (GCA) effects for grain Fe concentration, while Jirani and MORO had positive significant GCA effects for grain Zn concentration. For the specific combining ability (SCA), among the 56 hybrids evaluated, only the hybrids LCIC 9702 × Jirani and MORO × ZANGO had positive significant SCA effects for grain Fe concentration across locations, and for grain Zn concentration, the hybrids Gamoji × MORO, LCIC 9702 × Jirani, and ICMV 167006 × Jirani had positive significant SCA effects. The reciprocal effects were significant for grain Zn concentration, grain yield, flowering time, plant height, test weight, and downy mildew incidence, suggesting that the choice of a female or male parent is critical in hybrid production. Grain Fe and Zn concentration, flowering time, plant height, panicle length, panicle girth, panicle compactness, and downy mildew incidence were found to be predominantly under additive gene action, while grain yield and test weight were predominantly under non-additive gene action. A highly positive correlation was found between grain Fe and Zn concentrations, which implies that improving grain Fe trait automatically improves the grain Zn content. The stability analysis revealed that the hybrid ICMV 167006 × Jirani was the most stable and high-yielding with a high level of grain Fe and Zn micronutrients.

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Section: Estimates Of Variance and Genetic Variance Componentssupporting

confidence: 90%

Combining ability studies of grain Fe and Zn contents of pearl millet (Pennisetum glaucum L.) in West Africa

Gaoh

Gangashetty

Mohammed³

et al. 2023

Front. Plant Sci.

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“…The significant positive effects for pooled [h] and negative estimates for [l] showed the presence of duplicate types of gene interactions, which means dominant genes with small cumulative effects controlled the inheritance of the VL in both the crosses, the IL in C 1 as well as the IN and PL in C 2 (Table 2 and 3). Therefore, the selection should be delayed until a high level of gene fixation is attained and population improvement methods would be more effective to break the undesirable linkage and accumulate desirable genes (Pujar et al 2022). The significant contribution of the epistasis in controlling the inheritance of the VL and IL in pumpkins was earlier reported by Mohanty et al (1999); Pandey and Rao (2010); Almeida et al (2020); Yadav et al (2021) and in the summer squash by Kaur et al (2018).…”

Section: Resultsmentioning

confidence: 99%

Gene effects for begomovirus resistance and plant architecture attributes in pumpkin (Cucurbita moschata Duchesne)

Verma¹,

Garcha²,

Sharma³

et al. 2023

CZECH J GENET PLANT

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Knowledge of gene actions governing begomovirus resistance and plant architectural traits is a prerequisite for a successful hybrid breeding programme. Therefore, the gene actions associated with these traits were studied in two intervarietal crosses of Cucurbita moschata (C 1 : Punjab Nawab × MVSR-6711 and C 2 : Punjab Nawab × P-135). We used the generation mean analysis of six generations for this purpose. Significant differences between the generation means were observed for all the traits in both crosses. The parental lines differed significantly in most of the studied traits. The nature and magnitude of the gene effects of seventeen traits varied by trait and cross. A simple additive dominance model was adequate for the internode number, leaf length and width, petiole length, fruit weight and cavity diameter in C 1 and the number of fruits/plant in C 2 . The non-allelic interaction was found to be significant for a majority of the traits including the per cent disease index of the squash leaf curl China virus, tomato leaf curl New Delhi virus and their mixed infections, which indicated, that recurrent selection in biparental progeny might be useful for the accumulation of genes with additive effects. Duplicate epistasis was observed for the vine, internodal and peduncle length in C 1 and the internode number, petiole and peduncle length, peduncle and fruit polar diameter in C 2 . This information will help to establish a breeding program for the simultaneous improvement of virus resistance and yield traits in pumpkins.

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“…Partitioning of genetic variance into its all the probable components i.e, additive, dominance and all types of epistasis with regard to individual cross therefore assumes immense value in formulating an effective and sound breeding programme (Alvarez-Castro and Le Rouzic, 2015). Among the common approaches followed to understand the nature of gene effect, generation mean analysis using first degree statistics is an accurate one and gives detailed account of various gene effects and also the quality of the genes carried by the parents (Pujar et al 2022). It is also an important statistical tool for identification of epistasis using various basic generations from a cross between two parents (Bano et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Generation Mean Analysis for Yield and Yield Component Traits in Inter-specific Cross of Rice (Oryza sativa L.)

Kumar¹,

Srinivas²,

Rao³

et al. 2023

ASD

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Background: Information on gene action governing yield and yield component traits need to be studied for adoption of effective breeding procedure to wards development and isolation of high yielding promising lines from the cross with resistant to bacterial leaf blight, blast and tolerance to low soil phosphorous. The present investigation was taken up in this context to estimate the gene effects for yield and yield components of the cross, YH3 x AKDRMS 21-54, using five parameter model of generation mean analysis. Methods: The experimental material, P1, P2, F1, F2 and F3 generations, for the investigation was generated from Kharif 2019 onwards and evaluated at Agricultural College, Bapatla during Rabi 2021-22. Gene effects for grain yield and yield attributing traits were studied. Result: Mean effects of all traits studied were significant indicating the presence of sufficient variation for the traits. Significance of scaling tests revealed additive-dominant model as inadequate, indicating the presence of epistasis. Digenic non-allelic interaction model with five parameters, namely, m, d, h, i and l revealed that the epistatic interaction model was adequate to explain the gene action for the traits studied in the present investigation. Dominance x dominance gene interaction was pre-dominant for grain yield per plant and majority of yield component traits studied coupled with duplicate epistasis, indicating the importance of population improvement approaches, such as bi-parental mating and recurrent selection, followed by isolation of purelines in later generations of the cross for effective improvement of yield and majority of the yield component traits.

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Generation Mean Analysis Reveals the Predominant Gene Effects for Grain Iron and Zinc Contents in Pearl Millet

Cited by 6 publications

References 31 publications

Combining ability studies of grain Fe and Zn contents of pearl millet (Pennisetum glaucum L.) in West Africa

Combining ability studies of grain Fe and Zn contents of pearl millet (Pennisetum glaucum L.) in West Africa

Gene effects for begomovirus resistance and plant architecture attributes in pumpkin (Cucurbita moschata Duchesne)

Generation Mean Analysis for Yield and Yield Component Traits in Inter-specific Cross of Rice (Oryza sativa L.)

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