Heterosis for Flowering Time and Agronomic Traits among Early Open-pollinated Sweet Corn Cultivars

Dickert, T.E.; Tracy, William F.

doi:10.21273/jashs.127.5.793

Cited by 14 publications

(9 citation statements)

References 26 publications

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“…Note that the direct of effect for heterosis was reversed for flowering time. This is consistent with studies in maize which indicate that hybrid tend to flower earlier than their parents Dickert and Tracy (2002) .…”

Section: Resultssupporting

confidence: 92%

Phenotypic Data from Inbred Parents Can Improve Genomic Prediction in Pearl Millet Hybrids

Liang

Gupta

Yeh

et al. 2018

G3 Genes|Genomes|Genetics

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Pearl millet is a non-model grain and fodder crop adapted to extremely hot and dry environments globally. In India, a great deal of public and private sectors’ investment has focused on developing pearl millet single cross hybrids based on the cytoplasmic-genetic male sterility (CMS) system, while in Africa most pearl millet production relies on open pollinated varieties. Pearl millet lines were phenotyped for both the inbred parents and hybrids stage. Many breeding efforts focus on phenotypic selection of inbred parents to generate improved parental lines and hybrids. This study evaluated two genotyping techniques and four genomic selection schemes in pearl millet. Despite the fact that 6× more sequencing data were generated per sample for RAD-seq than for tGBS, tGBS yielded more than 2× as many informative SNPs (defined as those having MAF > 0.05) than RAD-seq. A genomic prediction scheme utilizing only data from hybrids generated prediction accuracies (median) ranging from 0.73-0.74 (1000-grain weight), 0.87-0.89 (days to flowering time), 0.48-0.51 (grain yield) and 0.72-0.73 (plant height). For traits with little to no heterosis, hybrid only and hybrid/inbred prediction schemes performed almost equivalently. For traits with significant mid-parent heterosis, the direct inclusion of phenotypic data from inbred lines significantly (P < 0.05) reduced prediction accuracy when all lines were analyzed together. However, when inbreds and hybrid trait values were both scored relative to the mean trait values for the respective populations, the inclusion of inbred phenotypic datasets moderately improved genomic predictions of the hybrid genomic estimated breeding values. Here we show that modern approaches to genotyping by sequencing can enable genomic selection in pearl millet. While historical pearl millet breeding records include a wealth of phenotypic data from inbred lines, we demonstrate that the naive incorporation of this data into a hybrid breeding program can reduce prediction accuracy, while controlling for the effects of heterosis per se allowed inbred genotype and trait data to improve the accuracy of genomic estimated breeding values for pearl millet hybrids.

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Section: Resultssupporting

confidence: 92%

Phenotypic Data from Inbred Parents Can Improve Genomic Prediction in Pearl Millet Hybrids

Liang

Gupta

Yeh

et al. 2018

G3 Genes|Genomes|Genetics

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“…In other words, the additive gene action was more preponderance in the inheritance of the studied ear traits, but non-additive genes played also a role in it. Similar findings were also reported by Dickert & Tracy (2002). Samad et al (1989) suggested that selection of traits having high GCA effects, low SCA effects, and high GCA : SCA ratio should result in high genetic advance in hybrid progenies.…”

Section: Resultssupporting

confidence: 85%

Combining Ability Analysis of Ear Characteristics of Sweet Corn Hybrids Suitable for Organic Crop Production

Chozin

Sudjatmiko

2019

Journal of Horticultural Research

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Good knowledge of genetic merits governing the inheritance of economic traits is of paramount importance to plant breeders for crop improvement. Objectives of the study were to investigate the genetic nature of ear traits in sweet corn (Zea mays convar. saccharata var. rugosa) based on the general and specific combining ability (GCA and SCA) analysis, and to determine the breeding potential of eight promising inbred lines for the development of new hybrid cultivars well suited for organic production. Thirty-six genotypes (hybrid families) derived from a half diallel cross design were grown under organic crop management at three agro-ecological zones of the tropics. Although the genotypes varied significantly for all the observed ear traits, some of them showed clear inconsistencies in performing husked ear size (length, diameter, and weight), kernel row number, and kernel number per row across environments. The combining ability analysis showed that additive gene action was more preponderance than non-additive gene actions in governing the inheritance of the studied ear traits. The inbred lines: Caps 5, Caps 17A, Caps 17B, and Caps 22 showed their potential as good partners for the improvement of ear performances as to the development of superior sweet corn cultivars for organic production.

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“…The desired heterosis values for various maturity and yield related traits result in the increase performance of F1 hybrids over parents. The desired negative heterosis were confirmed by (Dickert and Tracy 2002;Gupta and Nagda 2000;Saleh et al, 2002) who also obtained similar findings for days to pollen shedding.…”

Section: Heterosissupporting

confidence: 57%

Evaluation of yellow maize inbred lines for maturity and grain yield related traits using line×tester analysis

Ullah¹,

Ali²,

Salam³

et al. 2018

J Food Nut Agri

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Thirty yellow maize inbred lines were selected from different source populations and planted in isolation with common male testers (YD-2 and YD-4) in 1:4:1 ratio at Cereal Crop Research Institute (CCRI) Pirsabak, Nowshera during spring-2014 (season–I). On the bases of best seed setting and other important traits, eighteen test-crosses were selected using line × tester approach. The developed 18 test-crosses, nine parental lines and two testers along with two check cultivars (Sarhad Yellow and CS2Y10) were grown in summer season-2014 (July – November) using two replications.Data were collected on various maturities and yield related traits via; days to pollen shedding, silking, ear height, plant height, 100-kernel weight, kernel row ear-1 and grain yield. Significant differences were observed among test-crosses for yield related traits mainly 100-kernel weight and grain yield. L-9 using YD-4 as a tester revealed minimum days to pollen shedding (50.5 days) and days to silking (52.5 days). L-3 using YD-2 as a tester recorded maximum plant height while, L-9 using YD-4 as a tester obtained maximum ear height and length. L-9 using YD-4 as a tester revealed high 100-kernel weight, grain yield and high GCA effect, while L-8 using YD-4 as a tester recorded high SCA effect for 100-kernel weight. L-9 exhibited high GCA effect for grain yield while, high SCA effect was obtained for L-2 using tester (YD-2). L-9 using tester YD-4 revealed maximum mid-parent and best-parent heterosis for ear length and grain yield. For maximum traits, L-9 was the best combiner followed by L-3 and L-6 using the same tester (YD-4) under conducted study.

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Heterosis for Flowering Time and Agronomic Traits among Early Open-pollinated Sweet Corn Cultivars

Cited by 14 publications

References 26 publications

Phenotypic Data from Inbred Parents Can Improve Genomic Prediction in Pearl Millet Hybrids

Phenotypic Data from Inbred Parents Can Improve Genomic Prediction in Pearl Millet Hybrids

Combining Ability Analysis of Ear Characteristics of Sweet Corn Hybrids Suitable for Organic Crop Production

Evaluation of yellow maize inbred lines for maturity and grain yield related traits using line×tester analysis

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