Combining Ability and Gene Action Studies for Heat-tolerance Physio-biochemical Traits in Tomato

2016 ◽  
Vol 10 (2) ◽  
pp. 99-106 ◽  
Author(s):  
Uttam Bhattarai ◽  
Pranab Talukdar ◽  
Akashi Sharma ◽  
Ranjan Das
Keyword(s):  
Heat Tolerance ◽  
Combining Ability ◽  
Gene Action ◽  
Biochemical Traits

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

2020 ◽  
pp. 40-47
Author(s):  
Chiseche Mwanza ◽  
Mebelo Mataa ◽  
Langa Tembo
Keyword(s):  
Heat Stress ◽  
Heat Tolerance ◽  
Combining Ability ◽  
Gene Action ◽  
Abiotic Factors ◽  
Block Design ◽  
Control Site ◽  
Sub Saharan Africa ◽  
Tropical Maize ◽  
Sub Saharan

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.

scholarly journals Combining ability between common bean gene groups for root distribution trait

2020 ◽  
Vol 44 ◽  
Author(s):  
Paulo Henrique Cerutti ◽  
Sibila Grigolo ◽  
Rita Carolina de Melo ◽  
Ana Carolina da Costa Lara Fioreze ◽  
Altamir Frederico Guidolin ◽  
...  
Keyword(s):  
Common Bean ◽  
Combining Ability ◽  
Root Distribution ◽  
Gene Action ◽  
Relative Number ◽  
F1 Hybrids ◽  
Reciprocal Effect ◽  
Gene Group ◽  
Lattice Design ◽  
Additive Gene

ABSTRACT When different gene groups are combined by hybridization, the expression of predominant genes for a trait must be known. This understanding is fundamental to the decisions made by breeders in the stages of cultivation and selection of segregating populations during the breeding program. Thus, the objective of this study was to determine the effects of combining ability and gene action for the root distribution traits of the Andean and Mesoamerican common bean gene groups. Six common bean parents from the Andean and Mesoamerican groups were hybridized in a complete diallel mating scheme, resulting in 30 F1 hybrids. The parents and hybrids were planted in the field in a simple lattice design. The target trait was root distribution, calculated as the relative number of roots in the topsoil. The effect of the general combining ability was significantly higher than that of the specific combining ability (58%) and the reciprocal effect (41%). Particularly, the combination estimates were modified according to the order of the gene groups used. The combinations IPR Uirapuru x BAF53 (Mesoamerican x Andean), BAF53 x CBS14 (Andean x Andean), and CBS14 x IPR Uirapuru (Andean x Mesoamerican) mainly exhibited an increase in the mean root distribution. However, the highest fraction of genetic variance correlated with additive components (60%), even in crosses involving different gene groups. Consequently, the additive gene action was predominant in the expression of root distribution trait in common bean, irrespective of the gene group used.

scholarly journals Combining Ability and Gene Action for some Traits and level of Aflatoxin Contamination in Peanut

2016 ◽  
Vol 7 (12) ◽  
pp. 1449-1456
Author(s):  
Rehab Abd El-Rhman ◽  
Kh. El Meleigy ◽  
Wafaa Shafi
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Aflatoxin Contamination

scholarly journals Gene action and combining ability studies for protein content and grain quality traits in rice (Oryza sativa L.)

2019 ◽  
Vol 10 (1) ◽  
pp. 58
Author(s):  
M. Asvin Kirubha ◽  
R. P. Gnanamalar ◽  
K. Thangaraj ◽  
A. Kavitha Pushpam ◽  
A. R. Priyanka
Keyword(s):  
Oryza Sativa ◽  
Protein Content ◽  
Combining Ability ◽  
Grain Quality ◽  
Gene Action ◽  
Oryza Sativa L ◽  
Quality Traits

scholarly journals Combining Ability Studies for Identifying High Sugar Yielding Sweet Sorghum [Sorghum bicolor (L.) Moench] Genotypes

2020 ◽  
pp. 43-49
Author(s):  
B. C. Nandeshwar ◽  
Beka Biri ◽  
Alemayehu Dugassa
Keyword(s):  
Combining Ability ◽  
Sweet Sorghum ◽  
Gene Action ◽  
Ethanol Yield ◽  
Breeding Programme ◽  
Combining Ability Analysis ◽  
Half Diallel ◽  
High Ethanol ◽  
Sorghum Bicolor L ◽  
Pedigree Breeding

Combining ability analysis provides information about the gene action involved in the expression of a trait and facilitates breeding of superior cultivars. Hence, 45 hybrids evolved from 10 parent half-diallel were evaluated for combining ability to identify good general combiners and superior cross combinations for high ethanol yield from sweet sorghum. RSSV-21-2 has been identified as the best general combiner. It can be used in pedigree breeding programme for the incorporation of desired traits for enhancing ethanol yield. ARS-SS-35-1 × NSS-218 and ARS-SS-83 × NSS-221-2 have been identified as the best specific combinations. These could be exploited in heterosis breeding programme.

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