scholarly journals GENETIC EVALUATION OF SEED GERMINATION AND DEVELOPMENT OF SEEDLINGS IN Ormosia excelsa Benth

FLORESTA ◽  
2018 ◽  
Vol 48 (3) ◽  
pp. 331
Author(s):  
Jennifer Souza Tomaz ◽  
Maria Teresa Gomes Lopes ◽  
Mágno Sávio Ferreira Valente ◽  
Manuel De Jesus Vieira Lima Júnior ◽  
Graciela Inês Bolzón de Muniz ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Selection Process ◽  
Germination Rate ◽  
Different Temperatures ◽  
High Heritability ◽  
Mean Germination Time ◽  
Number Of Leaves ◽  
Set Up ◽  
Germination Traits ◽  
Selection Of

The aim of this study was to estimate the genetic parameters of Ormosia excelsa seeds based on germination traits, at different temperatures, in order to facilitate the selection of superior varieties of seeds for producing seedlings. Twenty six progenies collected in the municipality of Autazes (state of Amazonas, Brazil) were evaluated. The experiment was completely randomized, with four replications and 25 seeds per plot, totaling 100 seeds per progeny. The germination rate, mean germination time and the synchronization and speed germination indexes were determined at the temperatures of 30 and 35 °C. Seedling development was also evaluated under nursery conditions. The progenies of O. excelsa showed significant genetic variability for all traits. Both temperatures proved to be effective in producing germination close to 87%. Germination began between 1 and 4 days after sowing. However, for greater efficiency in the selection of superior progenies, each environment should be considered individually. The high heritability values obtained (> 65%) and the high genetic correlation favorable for selection, among all traits, resulted in significant gains according to the selection process used. Our results indicated that determining superior progenies for height and number of leaves was possible based on a single evaluation. The fact that 100% of seedlings planted in the field survived promotes a promising outlook to set up commercial nurseries for the species.

scholarly journals GENETIC PARAMETERS IN SEED CHARACTERS OF Ormosia discolor UNDER DIFFERENT AMBIENT CONDITIONS

FLORESTA ◽  
2021 ◽  
Vol 51 (2) ◽  
pp. 492
Author(s):  
Helinara Lais Vieira Capucho ◽  
Maria Teresa Gomes Lopes ◽  
Manuel de Jesus Vieira Lima Junior ◽  
Mágno Sávio Ferreira Valente ◽  
Angela Maria Da Silva Mendes ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Germination Rate ◽  
Direct Selection ◽  
Ambient Conditions ◽  
Biometric Analysis ◽  
Ambient Temperatures ◽  
Nodulation Capacity ◽  
High Heritability ◽  
Mean Germination Time ◽  
Seed Characters

Ormosia discolor Spruce ex Benth. is a native tree of the Amazon with has fast growth and nodulation capacity, whose seeds are used for craftwork. The objective of this study was to estimate genetic parameters in seed characters of O. discolor at different ambient temperatures and to indicate superior matrices to compose seed lots. Seeds of 20 progenies selected from a population in the state of Amazonas were collected. Three experiments were performed under different ambient temperatures at the Seed Center laboratory/UFAM. Experiment 1 was performed at constant temperature of 30 °C. In experiment 2, seeds were submitted to a temperature of 35 °C. In experiment 3, after five months of freezing, the seeds were submitted to a temperature of 30 °C. The experimental design was completely randomized, consisting of 20 progenies, four replicates, and 25 seeds per plot. The germination characters evaluated were germination rate, mean germination time, and synchronization and speed germination indexes. Genetic and phenotypic variances and correlations, broad-sense heritability, and genetic gain through direct selection were estimated. O.discolor progenies showed significant genetic variability for most of the characters evaluated. High heritability and accuracy values (> 90%) were found for germination rates at all ambient temperatures. Matrices 2, 7, and 16 were superior for germination characters at all temperatures tested, being indicated for seedling production. Eighteen O. discolor seeds are sufficient for biometric analysis with accuracy of 95% in genotype selection. 

scholarly journals Selection of cotton lines for high oil content

2017 ◽  
Vol 52 (7) ◽  
pp. 530-538 ◽  
Author(s):  
Luiz Paulo de Carvalho ◽  
Josiane Isabela da Silva Rodrigues ◽  
Francisco José Correia Farias
Keyword(s):  
Oil Content ◽  
Genetic Parameters ◽  
Fiber Quality ◽  
Rio Grande ◽  
Field Trials ◽  
The State ◽  
The Other ◽  
Expected Gain ◽  
High Heritability ◽  
Selection Of

Abstract: The objective of this work was to evaluate the oil content and characters related to fiber quality and yield in cotton lines (Gossypium hirsutum), in order to select genotypes with high oil content and acceptable levels of the other characters. Twenty-two F6 lines and three checks were cultivated in three field trials - two in the municipality of Apodi, in the state of Rio Grande do Norte, and one in the municipality of Barbalha, in the state of Ceará, both in Brazil. The genetic parameters and the genetic gain from selecting 20% of the lines were estimated according to their means in each environment and in the group of environments. Regarding oil content, there is genetic variability, and the selection based on the overall mean is indicated, since this character showed high heritability, with 4.58% expected gain. The lines selected with this criterion have oil contents between 23.52 and 24.51%, which are higher than those of the Brazilian cultivar BRS Aroeira with the highest grain oil content (22.04%).

scholarly journals Study of repeatability and phenotypical stabilization in kale using frequentist, Bayesian and bootstrap resampling approaches

2019 ◽  
Vol 41 (1) ◽  
pp. 42606
Author(s):  
Orlando Gonçalves Brito ◽  
Valter Carvalho de Andrade Júnior ◽  
Alcinei Mistico de Azevedo ◽  
Luan Mateus Silva Donato ◽  
Lidiane Rodrigues Silva ◽  
...  
Keyword(s):  
Genetic Improvement ◽  
Genetic Parameters ◽  
Block Design ◽  
Bootstrap Resampling ◽  
Average Mass ◽  
Estimated Parameters ◽  
Randomized Block Design ◽  
Number Of Leaves ◽  
Bayesian Methodologies ◽  
Selection Of

The aim of this study was to obtain information for the genetic improvement of kale through repeatability and phenotypic stabilization studies and to compare methodologies that represent the reliability of the estimated parameters. Thirty-three half-sib progenies were evaluated in a randomized block design with three replicates and six plants per plot. Eight harvests were evaluated in terms of the yield of fresh leaves, number of shoots, number of leaves and average mass of leaves. Then, a phenotypic repeatability and stabilization study was performed, estimating the genetic parameters σ2a, σ²g, σ²e, and the coefficient of environmental variation and repeatability using the frequentist and Bayesian methodologies. To evaluate the reliability of these estimates, intervals were obtained using the frequentist, Bayesian and bootstrap methods. It was verified that the reliable selection of progenies of half-sib of kale can be achieved in four harvests that were realized between 95 and 170 days after planting. It was observed that the frequentist and Bayesian methodologies are better suited to obtain reliable estimates of the genetic parameters evaluated, as the last one provided smaller amplitudes for the obtained intervals. The bootstrap methodologies are not recommended for phenotypic repeatability and stabilization studies in kale.

scholarly journals Morphometry and Germination of Passovia pyrifolia, Struthanthus marginatus and Phoradendron mucronatum Diaspores

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
J.M.L. AZEVEDO ◽  
C.G.G. SANTOS ◽  
C.S. CAIRES ◽  
J.C. ARAÚJO NETO ◽  
R.C. SOUZA
Keyword(s):  
Moisture Content ◽  
Germination Rate ◽  
Germination Percentage ◽  
Percentage Germination ◽  
Essential Characteristic ◽  
Germination Time ◽  
Randomized Design ◽  
Different Temperatures ◽  
Mean Germination Time ◽  
Completely Randomized Design

ABSTRACT: The goal of this work was to characterize morphometrically diaspores from three species of mistletoes (Passovia pyrifolia, Struthanthus marginatus e Phoradendron mucronatum), as well as to study its germination behavior according to temperature and luminosity. In germination tests, the completely randomized design was used, in factor scheme 4 x 2, with 4 replications of 15 diaspores. The factors for the first test were different temperatures and two diaspore conditions (intact and without epicarp). In the second test, factors were different light qualities and two diaspore conditions. The analyzed variables were: germination percentage, germination rate index (GRI) and mean germination time (MGT). Mistletoe’s diaspores present an elliptic shape with viscin layer, an essential characteristic for the dispersion of the species. In addition to this, they present a distinction as for the moisture content when compared to the Loranthaceae and Viscaceae, where the latter presents the highest content. Germination is greater at the alternated temperature of 20-30 oC for P. pyrifolia and P. mucronatum diaspores and 20 oC for S. marginatus. Luminosity interfered in the germination of P. mucronatum and S. marginatus but did not influence P. pyrifolia. The diaspore condition influenced the germination of the three studied species, observing a significant increase in their germination when the epicarp was removed. Temperature and luminosity interfere directly in the GRI and MGT of the three mistletoes species.

scholarly journals Genetic Variability, Inheritance and Correlation for Mineral Contents in Cabbage (Brassica Oleracea Var. Capitata L.)

2013 ◽  
Vol 21 (1) ◽  
pp. 91-97 ◽  
Author(s):  
B.K. Singh ◽  
S.R. Sharma ◽  
B. Singh
Keyword(s):  
Mineral Elements ◽  
Genetic Advance ◽  
Mineral Contents ◽  
Head Weight ◽  
Brassica Vegetables ◽  
Additive Gene ◽  
High Heritability ◽  
Dietary Minerals ◽  
Set Up ◽  
Selection Of

Abstract Brassica vegetables are important sources of dietary minerals. However, information on the inheritance and correlation for content of mineral elements such as iron, zinc, copper, manganese, potassium, and calcium in cabbage, which is essential if the quality of this vegetable is to be improved through breeding, is not available. Therefore, the experiment was set up with seventy-one cabbage genotypes including cultivars, germplasm and F1 hybrids grown in field. Mineral composition of the genotypes tested differed highly significantly indicating the presence of adequate amount of variability. A high heritability (>80%) accompanied by high genetic advance as percentage of mean (>40%) for uptake and accumulation of Fe, Zn, Cu, Mn and Ca indicates the predominance of additive gene, which could be improved by hybridization followed by selection breeding approach. Nevertheless, heterosis breeding would be an imperative in increasing the K content in cabbage heads as indicated by non-additive gene action for K accumulation having high heritability (>80%) and low genetic advance as percentage of mean (<30%). Moreover, both additive and non-additive genes were responsible for individual head weight. A positive correlation for Fe, Zn and Mn contents with other minerals will help in simultaneous selection of mineral elements. Nevertheless, major yield contributing ‘head weight’ was negatively correlated with minerals content and emphasized the selection of smaller head size to maintain the higher minerals content in tissues of cabbage heads. Hence, assessing the heritability, inheritance and correlation for minerals would be useful in the developing mineral-rich and productive genotypes.

scholarly journals Economic Traits Selection and Genetic Parameters of Herd Cows of the Aberdeen-Angus Breed

2020 ◽  
pp. 31-35
Author(s):  
В.М. Габидулин ◽  
С.А. Алимова ◽  
Х.Х. Тагиров
Keyword(s):  
Genetic Parameters ◽  
Dna Marker ◽  
Selection Process ◽  
Live Weight ◽  
Economic Traits ◽  
Genetic Progress ◽  
Genetic Potential ◽  
Genetic Reserve ◽  
Breeding Herd ◽  
Selection Of

Представлены результаты исследования по выявлению хозяйственно-биологических особенностей и селекционно-генетических параметров селекционируемых признаков коров стада абердин-ангусской породы австралийской репродукции. По результатам исследования выявлено, что генетический потенциал продуктивности максимально выражен в возрасте пяти лет (у полновозрастных коров) и перманентно сохраняется до девятилетнего возраста. Рост основных селекционируемых признаков с двух до пяти лет составил по живой массе 15,1%, по молочности – 5,1%. С увеличением возраста маток отмечен стабильный рост показателя «выход деловых телят» на 2,3%. Селекционный дифференциал за три поколения у коров в трёхлетнем возрасте по живой массе составил 23 кг и по молочности – 7,4 кг, коэффициент наследуемости составил 0,42 по живой массе и 0,36 – по молочности коров, эффект селекции по живой массе за поколение составил 9,7 кг, за год – 1,9 кг, по молочности – 2,7 кг и 0,5 кг соответственно. У генотипированных коров по схеме мать-дочь эффект селекции за поколение был выше у гетерозиготных генотипов дочерей, рождённых в Курганской области. Знание и рациональное использование традиционных и новых по ДНК маркерных методов селекции на производстве позволит выявить, а также реализовать генетический резерв животных и управлять селекционным процессом при совершенствовании племенного стада абердин-ангусской породы. The results of research on detecting of commercial-biological features and selection-genetic parameters of cows’ features under selection of the Australian reproduction Aberdeen-Angus breed herd of are presented. According to the results of the research it was revealed that the genetic potential of productivity is maximally expressed at the age of 5 years (in mature cowbanes) and persists permanently until the age of nine. The growth of the main features under selection from two to five years amounted to 15.1% by live weight, 5.1% by milking capacity. With an increase in the age of the dams a stable increase in the "calf crop percent" by 2.3% was noted. The selection differential for three generations in cows at the age of three years in living weight was 23 kg and in milking capacity – 7.4 kg, the inheritance coefficient was 0.42 in living weight and 0.36 - in milking capacity of cows, the effect of selection by live weight per generation was 9.7 kg, for the year – 1.9 kg, in milking capacity – 2.7 kg and 0.5 kg, respectively. In genotyped cows according to the dam-daughter scheme genetic progress through selection per generation was higher in heterozygous genotypes of daughters born in the Kurgan region. Knowledge and rational use of traditional and new DNA marker methods of selection at the place of production will allow identifying, as well as unlocking the genetic reserve of animals and managing the selection process while improving the breeding herd of the Aberdeen-Angus breed.

scholarly journals Fiber flax germination at different temperatures and salinity stress conditions

Sjemenarstvo ◽  
2021 ◽  
Vol 31 (1-2) ◽  
pp. 13-20
Author(s):  
Ivana Varga ◽  
Manda Antunović ◽  
Mirta Rastija ◽  
Dario Iljkić ◽  
Monika Tkalec Kojić
Keyword(s):  
Salinity Stress ◽  
Water Solution ◽  
Germination Rate ◽  
Negative Influence ◽  
Fiber Flax ◽  
Germination Energy ◽  
Different Temperatures ◽  
Set Up ◽  
Lower Temperature ◽  
Flax Cultivar

In this study the fiber flax (Linum usitassimum L.) cultivar Lirina was tested to seed germination under salinity of NaCl and two different temperatures. The experiment was set up in controlled conditions in fitotron (Aralab). There were two temperatures (10°C and 20°C) and different NaCl water solution used for salinity stress: 0 mM, 20 mM, 40 mM, 60 mM, 80 mM and 100 mM. There were 100 seeds sown in 4 replications. The germination energy (%) and germination rate (%) were determined on 3rd and 7th day, respectively. At the lower temperature (10°C) the seeds were not sprouted on 3rd day, whereas at higher temperature (20°C) mean germination energy was 31%. Germination rate (7th day) was quite similar at both temperatures (58% at 10°C and 59% at 20°C). The higher salinity stress of 80 and 100 mM had negative influence on germination energy as well germination rate. With increased salinity, the total seedlings length was also decreased. With increasing salinity (over 20 mM), the total seedlings length was also decreased. In out study, low salinity stress of 20 mM even increases the germination rate and germination energy and resulted with the longest seedlings of the fiber flax cultivar Lirina.

scholarly journals Genetic parameters and selection of biofortified lettuce genotypes based on selection indices

2021 ◽  
Vol 25 (11) ◽  
pp. 772-778
Author(s):  
Luciana A. de Sousa ◽  
Gabriel M. Maciel ◽  
Fernando C. Juliatti ◽  
Igor F. Beloti ◽  
Daniel B. O. Cardoso ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Agronomic Traits ◽  
Stem Diameter ◽  
Germplasm Bank ◽  
Narrow Sense Heritability ◽  
High Magnitude ◽  
Selection Indices ◽  
Number Of Leaves ◽  
High Concentrations ◽  
Selection Of

ABSTRACT Obtaining biofortified vegetables with an emphasis on lettuce is a tool to improve the nutritional status of the population. Selection indices can maximize the simultaneous selection of good agronomic traits and high carotenoid levels. The objective of this study was to estimate the genetic parameters and efficiency of different indices in selecting genotypes of biofortified lettuce with high concentrations of carotenoids and favorable agronomic traits. Statistical analyses were performed on 91 genotypes belonging to the vegetable germplasm bank of the Federal University of Uberlândia, Brazil. The variables analyzed were the chlorophyll index of the leaves, plant diameter, stem diameter, and number of leaves per plant. The values found for narrow sense heritability (h²) ranged from 89.63% (stem diameter) to 96.05% (chlorophyll), showing a high magnitude. The Smith-Hazel index, sum of ranks by the Mulamba & Mock index, direct and indirect selection, and Williams base index were used to predict the selection gains. A total of 17 individuals were selected using the selection methodologies. The Smith-Hazel, Williams, and Mulamba & Mock indices were efficient in showing good direct gains for the evaluated traits. Thirteen genotypes were selected for all indices presenting suitable agronomic traits, which show promise for advancing generations within the breeding program to obtain biofortified lettuce strains.

scholarly journals Cardinal temperatures for germination of Salvia leriifolia Benth

2015 ◽  
Vol 61 (1) ◽  
pp. 5-18 ◽  
Author(s):  
Majid Dashti ◽  
Mohammad Kafi ◽  
Hossein Tavakkoli ◽  
Mahdi Mirza
Keyword(s):  
Regression Models ◽  
Germination Rate ◽  
Germination Percentage ◽  
Randomized Design ◽  
Germination Process ◽  
Mean Germination Time ◽  
Completely Randomized Design ◽  
Response To Temperature ◽  
Germination Traits ◽  
Cardinal Temperatures

Summary The focus of this study is based on the examination of the germination traits and the development of thermal models of the medicinal plant Salvia leriifolia Benth. A laboratory experiment was carried out at constant temperatures ranging from 0 to 35°C, at 5°C intervals in a completely randomized design with eight replications. To describe the germination rate response to temperature, three regression models, namely Intersected-Lines (ISL), Quadratic Polynomial (QPN) and Five-Parameters Beta (FPB) were used. The highest Germination Percentage (GP) (92.8%) occurred in 15°C, but GP in the range of 10-25°C was not significant (p≤0.05). The germination process stopped at 0°C and at above 30°C. The results indicated that the highest Germination Rate (GR), the lowest Mean Germination Time (MGT) and also times to 50% germination (D50) were obtained at 20°C. Seeds did not reach to their 50% germination level in temperatures higher than 25°C. The FPB model had the best realistic estimation for cardinal temperatures. Based on models estimation, Base (Tb), Optimum (To) and Ceiling (Tc) temperatures were in the ranges of (1-1.9°C), (18.1-20.8°C) and (34.5-38.7°C), respectively.

scholarly journals Determination of PRSV Tolerant Papaya Plants from SBF6 Generation of Intergeneric Population Using Ranking Model System

2020 ◽  
pp. 133-139
Author(s):  
R. Mohammed Aseef ◽  
K. Soorianathasundaram ◽  
P. Paramaguru ◽  
P. Muthulakshmi ◽  
A. John Joel ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Selection Process ◽  
Model System ◽  
Disease Index ◽  
Ranking Model ◽  
Number Of Leaves ◽  
The Mean ◽  
Cent Disease ◽  
Variability Study

The Full-sib mated sixth (SBF6) generation of intergeneric population of papaya from the cross CP 50 x Vasconcellea cauliflora was evaluated to select the progenies with PRSV tolerance coupled with better yield. In order to identify the well performing progenies, the mean performance and genetic parameters were estimated. Interestingly, the results of the variability study revealed that the genotypic coefficient of variation on number of fruits, leaf area and number of leaves were higher and making it as the selectable traits. The correlation analysis was made to understand the degree of relationship between the PRSV tolerance and various morphological traits. The result showed that plant height and number of fruits were significantly and negatively correlated with per cent disease index (PDI) with the r value of -0.273 and -0.261 respectively. By considering the number of fruits as the selectable trait, a ranking model system was developed and the results showed 5 ranks of 53 progenies. Among them, 13 well performing progenies from Rank IV and Rank V were selected for further evaluation. The ranking model system helps the researchers by making the selection process statistically much easier and efficient.

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