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Genetic analysis of Yield and Its Components of *** Hybrids Using Resynthesized Rapeseed Lines

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Agricultural Sciences in China 2009年第11期8卷 1286-1292页

作者： ZHAO Yong-guo XIAO Ling LU Chang-ming Oilcrops Research Institute Chinese Academy of Agricultural Sciences Wuhan 430062 P.R. China Graduate School Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China

Resynthesized rapeseeds obtained by crossing the diploid parents Brassica rapa and Brassica oleracea have significant potential in hybrid breeding because of their higher genetic basis compared with Brassica napus cultivars. In this study, an 8 × 8 complete diallel experiment using four B. napus cultivars （BN） and four resynthesized rapeseed lines （RS） as parents was designed to study heterosis and genetic inheritance for yield components. The results showed that heterosis for yield per plant, the number of pods per plant and number of seeds per pod were high, with means 32.77, 24.49 and 15.71%, respectively. diallel analysis showed that both additive and dominant effects were significant for yield and yield components. All traits, except for 1 000-seed weight, were significant for bl mean squares and exhibited directional dominance. Dominant genes had positive effects on yield per plant, pods per plant and 1000-seed weight, and negative effects on seeds per pod （r=-0.86, -0.62, -0.41, and 0.47, respectively）. Narrow-sense heritability for yield per plant, pods per plant, and 1 000-seed weight and seeds per pod were 66, 31, 46 and 78% for the four traits, respectively. The Fl hybrids showed considerable yields compared to B. napus cultivars when B. napus cultivars and resynthesized rapeseeds were used as parents （NR hybrids）, with many more pods per plant and lower seeds per pod compared with the rapeseed cultivars, indicating that the resynthesized rapeseed may be applicable in current hybrid breeding programs.

关键词： diallel analysis heterosis yield components resynthesized rapeseed

Genetics of seed flavonoid content and antioxidant activity in cowpea(Vigna unguiculata L. Walp.)

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The Crop Journal 2016年第5期4卷 391-397页

作者： Maina Antoine Nassourou Yanou Nicolas Njintang Tchiagam Jean-Baptiste Noubissié Richard Marcel Nguimbou Joseph Martin Bell Department of Biological Sciences Faculty of Science University of Ngaoundéré Department of Food Science and Nutrition ENSAI University of Ngaoundéré Genetics and Plant Breeding Unit Department of Plant Biology Faculty of Science University of Yaoundé I

Information about the type of gene action governing the inheritance of cowpea seed flavonoid content and antioxidant activity is prerequisite for starting an effective breeding program for developing improved varieties. For this purpose, half-diallel crosses among seven diverse parents were made. The homozygous parents and 21 F1 hybrids were evaluated at Maroua in the Sudano-Sahelian zone of Cameroon using a randomized complete block design with three replicates. Flour samples produced from decorticated seeds were used for biochemical analysis. analysis of variance showed significant differences(P < 0.001) among genotypes for the studied traits with ranges of 363.6–453.9 mg rutin equivalent per 100 g dry weight(DW) for total flavonoids, 13.38–30.73 mg ascorbic acid equivalent per 1 g DW for ferric iron reducing activity, 70.98–266.93 mg trolox equivalent per 100 g DW for 2,2-diphenyl-1-picrylhydrazyl(DPPH) free radical scavenging activity, and 90.93–370.62 mg trolox equivalent per 100 g DW for 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid)(ABTS) free radical scavenging activity. Both additive and non-additive gene effects were significant in the genetic control of these traits, but dominance variance was greater than additive variance. The traits were mainly controlled by overdominance model suggesting a selection in the delayed ***- and narrow-sense heritability estimates varied from 0.90 to 0.99 and from 0.12 to 0.45,respectively. The variances due to both general and specific combining ability were highly significant for all studied traits. Recessive alleles had positive effects on DPPH and ABTS scavenging activities, whereas dominant alleles had positive effects on flavonoid content and ferric iron reducing activity. These results could help cowpea breeders to improve the antioxidant potential of cowpea seeds by appropriate selection.

关键词： Cowpea Genetic improvement diallel analysis Antioxidant properties

Combining ability studies in desi cotton(Gossypium arboreum L.)genotypes

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Journal of Cotton Research 2024年第4期7卷 361-371页

作者： ALAGARSAMY Manivannan ICAR-Central Institute for Cotton Research Regional StationCoimbatore 641003India

Background Studies on genetic variation and combining ability are essential tools to employ the suitable breeding programme,particularly for hybrid production,to exploit the heterosis in cross-pollinated crops like ***,combining ability studies in desi cotton(Gossypium arboreum L.)was carried out using 13 diverse parents through diallel mating design,evaluating 78 F,hybrids along with their parents,without reciprocals using Griffing's and Hayman's *** Genotypes H 509,AC 3265,AKH 496,and PBN 565 exhibited superior per se performance,indicating their potential use as parents in future breeding programs to develop superior *** general combining ability(GCA)effect of the genotypes revealed that AC 3097 and AKA 13-SP1 were good general combiners for most traits in this *** PBS 1127-SP1,AKH 496,H 509,N11-54-31-32,and AKA 13-SP1 exhibited strong combining ability,contributing to a significant specific combining ability(SCA)effect in seven selected crosses(AC 3265×PBS1127-SP1,AKH 496×H 509,AKH 496×AC 3097,PBS 1127-SP1×N11-54-31-32,AC 3216×AKA 13-SP1,H 503×N11-54-31-32,and H 509×AKA 13-SP1)for yield *** crosses showed positive heterosis in a positive *** From the present study,five genotypes(AC 3097,AKA 13-SP1,N11-54-31-32,AC 3265,and H 509)were identified as good general combiners for producing hybrids,and seven combinations showed a promising hybrid for future breeding programs.

关键词： Combining ability Desi cotton diallel analysis Gene action

Combining ability and gene action studies for yield and fibre traits in Gossypium arboreum using Griffings numerical and Haymans graphical approach

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Journal of Cotton Research 2023年第3期6卷 141-156页

作者： SUKRUTHA Bhimireddy RAJESWARI Sivakami PREMALATHA N. BOOPATHI Narayana Manikanda THIRUKUMARAN K. MANIVANNAN A. Department of Cotton Centre for Plant Breeding and GeneticsTamil Nadu Agricultural UniversityCoimbatoreIndia O/O Directorate of Research Tamil Nadu Agricultural UniversityCoimbatoreIndia Department of Agronomy Central Farm UnitTamil Nadu Agricultural UniversityCoimbatoreIndia ICAR-Central Institute of Cotton Research Regional StationCoimbatoreIndia

Background For the purpose of utilising hybrid vigour to produce possible hybrids with a suitable level of stability,the knowledge of gene activity and combining ability is a crucial prerequisite before choosing desirable *** present study was carried out with six parents crossed in full diallel fashion and generated 30 F1 *** hybrids were evaluated in two replications in Randomized Block Design at Department of Cotton,TNAU for combining ability and gene *** analysis was carried out according to Griffing’s method-I(parents + F_(1) + reciprocals) and model-I and Hayman’s graphical approach by using INDOSTAT *** analysis of variance for combining ability indicated that mean square values of GCA,SCA and reciprocals were highly significant for all the traits except for the uniformity ***763 and K12 showed highly positively significant GCA effects for most of the yield traits while PA838 and K12 for fibre quality traits,so they were found as best general ***379 × K12 and PDB29 × K12 for yield traits,and PDB29 × PA838,RG763 × PA838,and CNA1007 × RG763 cross combinations for fibre quality traits could be recommended for future breeding *** The results of both Griffing’s and Hayman’s approaches showed that non-additive gene action predominates as SCA variance was bigger than GCA variance,so heterosis breeding is thought to be a more fruitful option for enhancing GCA of many traits.

关键词： Gene action Combining ability diallel analysis Hayman’s approach Griffing’s approach Vr-Wr graph Desi cotton

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