Relationship of Line per se and Testcross Performance for Grain Yield of Tropical Maize in Drought and Well‐Watered Trials

Kebede, Aida Z.; Melchinger, Albrecht E.; Cairns, Jill E.; Araus, José Luís; Makumbi, Dan; Atlin, G. N.

doi:10.2135/cropsci2012.08.0495

Cited by 16 publications

(20 citation statements)

References 31 publications

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“…This is in accordance with the quantitative genetic theory where the genetic coefficient of variation is expected to be about four times more in inbred lines than that of testcrosses (Miedaner et al, 2014;Smith, 1986). Most of the studies focussing on comparison between lines per se performance and testcross performance in maize under stress have always used elite inbred lines with prior information on performance and heterotic grouping (Betrán et al, 2003;Kebede et al, 2013;Parentoni et al, 2010). This would imply that our tester was generally well performing, thus masking a high frequency of unfavorable alleles in the testcrosses (Smith, 1986).…”

Section: Reduced Genetic Variation For Grain Yield Under Low P In Tessupporting

confidence: 74%

“…Genotypic correlations were computed on the basis of BLUPs from all single trials and the genetic coefficients of correlation between HP vs. LP and/or IBL vs. TC (for simplicity marked as x and y) were calculated according to Cooper et al (1996) and Kebede et al (2013) assuming no environmental covariance between the LP and HP trials due to the experimental set up as: Genotypic correlations were computed on the basis of BLUPs from all single trials and the genetic coefficients of correlation between HP vs. LP and/or IBL vs. TC (for simplicity marked as x and y) were calculated according to Cooper et al (1996) and Kebede et al (2013) assuming no environmental covariance between the LP and HP trials due to the experimental set up as:…”

Section: Statistical Analysesmentioning

confidence: 99%

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Pearl Millet Inbred and Testcross Performance under Low Phosphorus in West Africa

Gemenet

Hash²,

et al. 2014

Crop Science

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Pearl millet [Pennisetum glaucum (L.) R. Br] is a food security crop for millions living in drylands of Africa and Asia. Its production on acid sandy soils of the Sahel is limited by erratic rainfall and poor soil fertility, especially low P soils. We sought to elucidate the genetic variation in West and Central African landrace‐derived inbred lines for grain yield under low P conditions, to determine their performance as inbred lines per se and in hybrid combinations, and to determine quantitative‐genetic parameters to derive an appropriate breeding strategy to enhance grain yield under low P conditions. We evaluated a total of 155 landrace‐derived inbred lines as well as their testcrosses in four locations during two years under two treatments, high P (HP; with P fertilization) and low P (LP; without P fertilization). Results revealed significant effects for genotypes, P‐level, genotype × P‐level, as well as genotype × environment interactions. Grain yield reductions under LP treatment ranged from 7.9 to 35.5%, and 11.2 to 60.9% for inbred lines and testcrosses respectively, with positive midparent heterosis averaging 43.5% under LP. We conclude that direct selection of testcrosses under LP is more effective and that indirect selection for testross performance from inbred line performance is not desirable.

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Section: Reduced Genetic Variation For Grain Yield Under Low P In Tessupporting

confidence: 74%

Section: Statistical Analysesmentioning

confidence: 99%

Pearl Millet Inbred and Testcross Performance under Low Phosphorus in West Africa

Gemenet

Hash²,

et al. 2014

Crop Science

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“…Ketersediaan air yang menurun disertai musim kemarau panjang akibat perubahan iklim berdampak terhadap penurunan produksi jagung pada lahan kering dan tadah hujan. Penurunan produksi jagung akibat kekeringan di daerah tropis berkisar antara 50-80% (Monneveux et al 2006, Iriany et al 2007, Efendi dan Azrai 2010, Kebede et al 2013, Suwardi dan Azrai 2013. Kandungan hara N tanah rendah juga menjadi faktor pembatas upaya peningkatan produksi jagung.…”

Section: Pendahuluanunclassified

Daya Gabung Inbrida Jagung Toleran Cekaman Kekeringan dan Nitrogen Rendah pada Pembentukan Varietas Hibrida

Efendi

Takdir

Azrai

2017

j. penelit. pertan. tanam. pangan

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“…Both per se performance and combining ability of the inbred parents have been used separately or in combination to predict hybrid performance for different crops including sorghum (Mahama et al, 2014;Kenga et al, 2006); maize (Kebede et al, 2013;Makanda et al, 2010) and rice (Xie et al, 2014). The aforementioned studies have reported positive correlations between inbred per se performance and their hybrid grain yield performance under both drought stress and non-stressed conditions in subtropical and tropical environments.…”

Section: Per Se Performance and Combining Ability Of Inbred Parentsmentioning

confidence: 99%

“…A similar observation has been reported for maize under moisture stressed condition (Betrȃn et al, 2003a). Response to drought stress could therefore be an important selection criterion for lowland adapted genotypes to be used for hybrid development (Kebede et al, 2013). In a recent study, prediction of hybrid grain yield performance based on the component traits has been found promising (Prado et al, 2013).…”

Section: Per Se Performance and Gca Of Locally Adapted Genotypes As Pmentioning

confidence: 99%

Genetic differentiation, heterotic performance and grain yield determinate traits of locally adapted sorghum genotypes in contrasting environments in Ethiopia

Mindaye¹

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The increase superiority in characteristics such as size, growth rate, fertility, yield and general fitness of hybrids produced by crossing genetically diverse inbred parents is well established in many plant and animal species. This phenomenon has been exploited to produce commercial cultivars in a range of crop species including sorghum.In sorghum F1 hybrid seed is produced by crossing genetically distinct restorer (R lines) and cytoplasmic male sterile seed parent (A lines). In the developed world commercial cultivars are almost exclusively F1 hybrids and are increasingly being used in the developing countries. In spite of the yield advantage in some circumstances, however, hybrids developed using introduced parental lines have not been adopted by Ethiopian farmers primarily because of the extra cost of purchasing seed has not been outweighed by the benefits of introduced hybrids in particular the lack of farmer preferred traits such as tall stature and larger grain size. The development of hybrids using locally adapted genotypes could have the potential to overcome the shortcomings of introduced hybrids. However, the complex cytoplasmic male sterility system and prevalence of restorer genes complicate the development of new Additionally, the hybrids derived from these locally adapted genotypes will have the benefit of containing farmers preferred traits. The groups most divergent from the introduced A/B lines were the Ethiopian landraces adapted to highland and intermediate agro-ecologies and a subset of lowland adapted genotypes. These genotype groups were also grouped distinctly from the introduced R lines, and hence provide highly divergent parental lines for hybrid development in Ethiopia.The performance and magnitude of heterosis of 139 F1 hybrids, derived from introduced seed parents crossed with selected locally adapted genotypes and introduced R lines, were evaluated in three contrasting environments. The lowland adapted hybrids displayed a mean better parent heterosis (BPH)iii of 19% and a 29% increase in grain yield, on average, in comparison to the hybrids derived from the introduced R lines. In addition, these hybrids were also found to be superior in plant height and grain weight. The mean BPH for grain yield for the highland adapted hybrids was 16% in the highland and 52 % in the intermediate, in addition to increased grain weight. The magnitude of heterosis between the three hybrid groups reflected the genetic distance between the genotype groups with the A/B lines.These results highlight the potential of locally adapted genotypes for the exploitation of heterosis in Ethiopia.In order to understand the genetic basis of increased hybrid performance, the relationship between yield component traits was assessed and the genetic variance for each subset of hybrid group was partitioned into parental lines and their interaction effects. In the lowland environment, increase in grain number and grain weight contributed to increased yield of the lowland adapted hybrids in comparison to the intro...

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Relationship of Line per se and Testcross Performance for Grain Yield of Tropical Maize in Drought and Well‐Watered Trials

Cited by 16 publications

References 31 publications

Pearl Millet Inbred and Testcross Performance under Low Phosphorus in West Africa

Pearl Millet Inbred and Testcross Performance under Low Phosphorus in West Africa

Daya Gabung Inbrida Jagung Toleran Cekaman Kekeringan dan Nitrogen Rendah pada Pembentukan Varietas Hibrida

Genetic differentiation, heterotic performance and grain yield determinate traits of locally adapted sorghum genotypes in contrasting environments in Ethiopia

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