scholarly journals Genetic variability of agronomic traits in extra-early maturing Introgression Lines (ILs) of pigeonpea [Cajanus cajan (L.)]

2021 ◽  
Vol 12 (2) ◽  
Keyword(s):  
Genetic Variability ◽  
Cajanus Cajan ◽  
Agronomic Traits ◽  
Introgression Lines ◽  
Early Maturing

scholarly journals Evaluating the genetic variability of rubber hybrid progenies of the two crosses PB260 x RO44/71 and PB260 x RO62/54 by RAPD technique

2019 ◽  
Vol 2 (3) ◽  
pp. 36-43
Author(s):  
Thien Minh Nguyen ◽  
Tien Thi My Pham
Keyword(s):  
Genetic Variation ◽  
Genetic Variability ◽  
Genetic Similarity ◽  
Field Experiments ◽  
Agronomic Traits ◽  
Genetic Relationships ◽  
Genetic Material ◽  
Population Based ◽  
Shannon Index ◽  
Polymorphic Bands

The agronomic values of this population have been evaluated in the field experiments based on their phenotypic performance of agronomic traits, but the genetic variability of this population needs to be evaluated via techniques based on genetic material - DNA. In this study, the genetic variability in the investigated population of 71 hybrids and their parents was evaluated by RAPD technique, using eight selected arbitrarily primers; Genetic parameters and dendrogram expressing the genetic relationships among the investigated population were analyzed by GenALEx 6.1, Popgene 1.31 and NTSYSpc 2.1 softwares. Eight primers were used to generate the amplify products on each individual in the investigated population. From 74 genotypes, a total of 109 fragments were generated, among which, there were 89 polymorphic bands representing 81.65% with an average of 11 polymorphic bands/primer. Genetic similarity coefficient among the investigated population, based on DICE coefficient, ranged from 0.560 (LH05/0822 and PB260) to 0.991 (LH05/0781 and LH05/0841) with an average of 0,796, meaning that the genetic distance among ranged from 0.009 to 0.440 with an average of 0.231. The Shannon index and mean heterozygosity values were 0.328 and 0,176, respectively. This indicated that the progenies of the two investigated crosses possessed a relatively high range of genetic variability. The analysis of molecular variance (AMOVA) showed that genetic variation within population represented 62%, while genetic variation among two different crosses contributes 38% to the total genetic variability. Dendrogram based on DICE’s genetic similarity using UPGMA method showed that the hybrids divide into two major genetic groups (0.75), but the crosses were scattered independently of the hybrid.

scholarly journals Selección para calidad fisiológica de la semilla y rendimiento en líneas S2 derivadas de cuatro poblaciones tropicales de maíz (Zea mays L.)

2016 ◽  
Vol 7 (1) ◽  
pp. 58
Author(s):  
Enrique Navarro ◽  
Cristina Vega ◽  
Fernando Narváez ◽  
Hugo Córdova
Keyword(s):  
Genetic Variability ◽  
Grain Yield ◽  
Recurrent Selection ◽  
Zea Mays L ◽  
Agronomic Traits ◽  
Reciprocal Recurrent Selection ◽  
Laboratory Conditions ◽  
Flower Plant ◽  
Ear Height ◽  
Field And Laboratory Conditions

This study was carried out in 1993 to evaluate S2 lines from four maize tropical populations improved by reciprocal recurrent selection. These lines were evaluated under field and laboratory conditions, the latter one to determine physiology quality. The main goal was to measure genetic variability within and among populations for traits such as grain yield, vigor and germination and to select the best lines under field and laboratory conditions. The combined analysis of variance showed great genetic variability among the S2 lines within and among populations for grain yield, days to flower, plant and ear height, among others. The maximum genetic variability was observed on the lines from population 43 and pool 23 for most of the traits, although the latter showed a greater genetic variability for grain yield. Besides, it is important to mention that the above populations included the best genotypes for grain yield, germination and vigor. Taking into account the above mentionel agronomic traits, fifteen lines were selected; 2 belong to population 43* pool 20, 2 from pool 19* pool 23, 8 from population 43, and 3 from pool 23. These results confirm the genetic superiority of the lines from populations 43 and pool 23, so that these populations should be recommended for future genetic improvement by reciprocal recurrent procedures.

scholarly journals Integrating Conventional and Participatory Breeding Approaches in Assessment of Common Bean Varieties for Farmer Preffered Traits

2019 ◽  
Vol 11 (5) ◽  
pp. 104
Author(s):  
Papias H. Binagwa ◽  
Magdalena William ◽  
Julius P. Mbiu ◽  
Eunice Zakayo ◽  
Shida M. Nestory ◽  
...  
Keyword(s):  
Common Bean ◽  
Agronomic Traits ◽  
Selection Process ◽  
Block Design ◽  
Group Discussion ◽  
High Yield ◽  
Market Demand ◽  
Variety Selection ◽  
Early Maturing ◽  
Participatory Variety Selection

It is estimated that over 75% of rural households in Tanzania depend on common bean (Phaseolus vulgaris L.) for daily subsistence. Recently, farmers have been increasingly looking for improved bean varieties which meet specific market demands characterized with yellow seed colour, early maturing and/or adapted to local agro-ecologies. Study focused on assessing the performance of bean varieties for agronomic traits through variety and environmental interactions by identifying high yielding, ealy maturing and market demand seed classes among the tested materials. For testing adaptability and stability, experiments were conducted in low to high altitudes for two consecutive years using randomized complete block design (RCBD) with three replicates. Eight common bean varieties KG98, Navy line 1, KATB9, SABRYT, KATB1, Lyamungu 85, JESCA and Calima Uyole were used. Absolute, matrix and pairwise ranking were used integratively for farmers’ and researcher’s assessment and selection. Participatory variety selection approach gave farmers an opportunity to assess and select varieties from a range of near finished materials in the breeding process. As part of the Farmers’ participatory variety selection process, seventeen participants as among the consumers 46% being women were selected to participate in a focused group discussion. Results revealed that, days to flowering, days to maturity and yield across the tested environments showed significant differences (p ≤ 0.05) as well as yield and diseases interactions for genotype, environment and season. Field data and farmers’ assessment data showed two varieties of KATB1 (yellow round) and KATB9 (red round) for better performance (high yield) and grain preference respectively. It showed that, early maturing; seed type and marketability varieties are highly demanded by bean farmers in Tanzania.

Flowering of pigeonpea (Cajanus cajan) in Kenya: Responses of early-maturing genotypes to location and date of sowing

1995 ◽  
Vol 41 (1) ◽  
pp. 25-34 ◽  
Author(s):  
P.A. Omanga ◽  
R.J. Summerfield ◽  
A. Qi
Keyword(s):  
Cajanus Cajan ◽  
Early Maturing

Genetic Variability for Yield and Other Agronomic Traits in Sweet Potato

2006 ◽  
Vol 6 (1) ◽  
pp. 94-99 ◽  
Author(s):  
Engida Tsegaye . ◽  
Nigussie Dechassa . ◽  
E.V. Devakara Sastry .
Keyword(s):  
Genetic Variability ◽  
Sweet Potato ◽  
Agronomic Traits

scholarly journals Evaluation and Identification of Promising Introgression Lines Derived From Wild Cajanus Species for Broadening the Genetic Base of Cultivated Pigeonpea [Cajanus cajan (L.) Millsp.]

2019 ◽  
Vol 10 ◽  
Author(s):  
Shivali Sharma ◽  
Pronob J. Paul ◽  
C.V. Sameer Kumar ◽  
P. Jaganmohan Rao ◽  
L. Prashanti ◽  
...  
Keyword(s):  
Cajanus Cajan ◽  
Introgression Lines ◽  
Genetic Base

scholarly journals Development and evaluation of diverse promising rapeseed (Brassica napus L.) mutants using physical and chemical mutagens

OCL ◽  
2019 ◽  
Vol 26 ◽  
pp. 35 ◽  
Author(s):  
Souhail Channaoui ◽  
Mostapha Labhilili ◽  
Mohamed Mouhib ◽  
Hamid Mazouz ◽  
Mohamed El Fechtali ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Gamma Rays ◽  
Agronomic Traits ◽  
Breeding Program ◽  
High Concentration ◽  
Brassica Napus L ◽  
Large Variability ◽  
Chemical Mutagens ◽  
Plant Breeding Program ◽  
Physical And Chemical

Genetic variability is a prerequisite for any plant breeding program, and mutagenesis is a proven way of creating new variation within a crop germplasm. Novel genetic variability in rapeseed was induced by gamma rays, Ethyl Methane Sulphonate (EMS) and combined mutagen treatment, using various doses and concentrations. The objective was to evaluate and compare the obtained M2 mutants for important quantitative traits in two contrasted environments. Data on phenological, morphological and agronomic parameters were recorded. A large variability was observed and mutagenic treatments had a significant effect on all traits studied. Compared to control plants, mutant genotypes derived from seeds treated with low EMS concentrations during moderate time were earlier and characterized by a higher number of pods per plant. For high concentration of EMS during long time and for combinations of physical and chemical mutagens, a significant decrease in plant height and stature was noticed, as compared to control. Besides, plants derived from gamma rays-treated seeds exhibited the highest 1000-seed weight. The novel induced variability may be integrated in rapeseed breeding program as a new germplasm with improved agronomic traits. Particularly, EMS1-7-stable mutant may be exploited to develop efficiently and quickly a new rapeseed cultivar with some desirable traits. The present study highlights once more the possibility to bring novel genetic diversity for rapeseed desirable traits improvement through mutation breeding.

scholarly journals Predicting the genetic gain in the Brazilian white maize landrace

2009 ◽  
Vol 39 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Ana Raquel Ribeiro e Souza ◽  
Glauco Vieira Miranda ◽  
Messias Gonzaga Pereira ◽  
Leandro Vagno de Souza
Keyword(s):  
Genetic Variability ◽  
Grain Yield ◽  
Genetic Gain ◽  
Plant Density ◽  
Production Systems ◽  
Agronomic Traits ◽  
Minas Gerais ◽  
Phenotypic Variance ◽  
Environment Interaction ◽  
Maize Landrace

The objectives of this research were to evaluate the genetic variability and predict genetic gain in the white maize landrace rescued in Barbacena, Minas Gerais, Brazil. The Brazilian maize landraces have economic and social importance for certain areas in Brazil, and research on this germplasm is very important for local food security. Three experiments were carried out with 100 half-sib progenies, in Campos dos Goytacazes, RJ, Coimbra and Barbacena, Minas Gerais, Brazil. These sites were chosen for their soil and climatic differences. An analysis of variance was significant among the progeny for all characters, indicating the presence of genetic variability between the three populations. In Campos dos Goytacazes and Coimbra, the genetic variation of the white maize landrace was responsible for most of the phenotypic variance in grain yield and can be used in selection cycles. There was no significant genetic variance in grain yield in Barbacena. For the white maize landrace it was concluded that: the characters of the component of productivity such as plant density and number of plants with kernels can produce indirect genetic gain for grain yield and are suitable for breeding; prebreeding of the maize landrace is necessary before being used directly in the elite germplasm; the population contains high genetic variability and opportunities for genetic gain; the average agronomic traits are suitable only for traditional production systems with few inputs, and polyculture; the difference between environments produces specific responses in the progeny i.e. there is a progeny x environment interaction.

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