scholarly journals Effect of gamma-radiation and sodium azide on quantitative characters in rice (Oryza sativa L.)

1998 ◽  
Vol 21 (1) ◽  
pp. 81-85 ◽  
Author(s):  
Ricardo Montalván ◽  
Akihiko Ando
Keyword(s):  
Gamma Rays ◽  
Sodium Azide ◽  
Quantitative Traits ◽  
Oryza Sativa L ◽  
Rice Cultivar ◽  
Tiller Number ◽  
Combined Treatments ◽  
Quantitative Characters ◽  
Mean And Variance ◽  
The Mean

Seeds of rice cultivar IAC-1246 received single and combined treatments of 10 or 20 Krad gamma-rays and 0.5 mM sodium azide (SA). The experiments were carried out to assess the effect of treatments on the mean and variance in second generation plants of the following quantitative traits: number of days to flowering (NDF), culm length (CL) and tiller number (TN). In general, the mutagenic treatments increased variance, but did not change the mean for the characters NDF and CL in the M2 generation. There was no increase in the mean or variance of TN. The combined treatments of gamma-rays and SA resulted in larger variance in CL than for the treatments with gamma-rays alone, but not higher than obtained with SA alone. Combined treatments with gamma-rays and SA did not increase the variance of NDF and TN when compared with the corresponding single treatments.

scholarly journals Quantitative traits under selection: derivations of distributions, higher moments, and the effects of recombination

2021 ◽  
Author(s):  
Reginald D Smith
Keyword(s):  
Quantitative Traits ◽  
Exact Formula ◽  
Breeding Value ◽  
Breeding Values ◽  
Mean And Variance ◽  
The Mean ◽  
The Impact ◽  
First Four Moments ◽  
First Time ◽  
Fertile Area

The mathematical theory of quantitative traits is over one hundred years old but it is still a fertile area for research and analysis. However, the effects of selection on a quantitative trait, while well understood for the effects on the mean and variance, have traditionally been difficult to attack from the perspective of analyzing the probability density of the breeding values and deriving higher (third and fourth) moments as well as analyzing the impact of recombination. In this paper, the exact formula for the breeding value distribution after selection is derived and, using new integral tables, the first four moments are given exact expressions for the first time. In addition, the effects of recombination on the full distribution of breeding values are demonstrated. Finally, the changes of GXE covariance in the selected parent population caused by factors similar to the Bulmer Effect are also investigated in detail.

scholarly journals On the distribution of the mean and variance of a quantitative trait under mutation-selection-drift balance.

Genetics ◽  
1994 ◽  
Vol 138 (3) ◽  
pp. 901-912 ◽  
Author(s):  
R Bürger ◽  
R Lande
Keyword(s):  
Genetic Drift ◽  
Quantitative Trait ◽  
Quantitative Traits ◽  
Genetic Variance ◽  
Stochastic Simulations ◽  
Stabilizing Selection ◽  
Phenotypic Evolution ◽  
Theoretical Predictions ◽  
Mean And Variance ◽  
The Mean

Abstract The distributions of the mean phenotype and of the genetic variance of a polygenic trait under a balance between mutation, stabilizing selection and genetic drift are investigated. This is done by stochastic simulations in which each individual and each gene are represented. The results are compared with theoretical predictions. Some aspects of the existing theories for the evolution of quantitative traits are discussed. The maintenance of genetic variance and the average dynamics of phenotypic evolution in finite populations (with Ne < 1000) are generally simpler than those suggested by some recent deterministic theories for infinite populations.

Effect of gamma rays and ethyl methane sulphonate (EMS) on yield and yield attributes of Cicer arietinum in M1 generation.

1970 ◽  
pp. 01
Author(s):  
L. Mullainathan ◽  
S. Umavathi
Keyword(s):  
Gamma Rays ◽  
Quantitative Traits ◽  
Mean Value ◽  
Ethyl Methane Sulphonate ◽  
Yield Attributes ◽  
Methane Sulphonate ◽  
Treated Plant ◽  
The Mean ◽  
Lethal Doses ◽  
Different Doses

A study was conducted to compare the effect of mutagens on yield and yield attributes of chickpea in M1 generation. In this regard, ‘CO-4’ variety of chickpea was subjected to different concentrations of gamma rays (20, 30, 40, 50 and 60kR) and EMS (10, 20, 30, 40 and 50mM) for inducing mutation. The effect of gamma rays and EMS with different doses/concentrations on yield and yield attributes were observed in M1 generation. From the result, it was observed that the mean value of all the quantitative traits of M1 generation showed a reduction upon enhancing the doses of mutagen. Mean performance in terms of these traits showed good qualities in comparison with the treated plant. The lethal doses were found in 40kR of gamma rays and 30mM of EMS and were carefully analyzed for further generations.

scholarly journals Agro-morphological diversity (quantitative traits) of rice (Oryza sativa L.) cultivated in Baglung District, Nepal

2018 ◽  
Vol 6 ◽  
pp. 52-57
Author(s):  
Hom Nath Pathak
Keyword(s):  
Oryza Sativa ◽  
Quantitative Traits ◽  
Oryza Sativa L ◽  
Crop Improvement ◽  
Germplasm Conservation ◽  
Morphological Diversity ◽  
Morphological Characters ◽  
Cultivated Rice ◽  
Rice Landraces ◽  
Quantitative Characters

Agro-morphological traits are the features of cultivated rice i.e. Oryza sativa L. Rice landraces differ from the other landrace in morphological features such as grain weight, culm number, and height of the plant. Nineteen different landraces of cultivated rice from Paiyunpata village, Baglung were studied and their quantitative characters were measured. The most varied landraces in morphological characters (Khate, Rato, Nepale, Anadi etc. i.e. species far from quadrants in PCA) are suggested for crop improvement. Findings from this research could be helpful for germplasm conservation.

scholarly journals Genetic evaluation of tidal swamp rice from South Kalimantan, Indonesia based on the agro-morphological markers

2020 ◽  
Vol 21 (10) ◽  
Author(s):  
Dindin Hidayatul Mursyidin ◽  
Izhar Khairullah
Keyword(s):  
Morphological Traits ◽  
Quantitative Traits ◽  
Oryza Sativa L ◽  
Rice Cultivar ◽  
Genetic Evaluation ◽  
Rice Breeding ◽  
Morphological Markers ◽  
Breeding Programs ◽  
Tidal Swamp ◽  
Basal Internode

Abstract. Mursyidin DH, Khairullah I. 2020. Genetic evaluation of tidal swamp rice from South Kalimantan, Indonesia based on the agro-morphological markers. Biodiversitas 21: 4795-4803. A total of 71 cultivars of the tidal swamp rice (Oryza sativa L.), originated mainly from South Kalimantan, Indonesia, were evaluated agro-morphologically by using 26 qualitative and 13 quantitative traits. Based on these traits, this germplasm is generally low in diversity. However, three agro-morphological traits, namely the tillering abilities, seedling height, and diameter of the basal internode, shows the relatively highest diversity, shown by the Lakatan Putih, Pandak Putih, and Bayar Papuyu, respectively. The UPGMA and PCA revealed that this germplasm divided into six main clusters, where the sixth cluster is the largest with a total membership of 60 cultivars. The cluster analysis also revealed that Lakatan Siam is far separate from other cultivars. Thus, this finding might be useful in the future rice breeding programs, particularly in developing new rice cultivar for the tidal swamp areas.

scholarly journals STUDIES ON THE INDUCTION OF NEW GENETIC VARIABILITY FOR QUANTITATIVE TRAITS BY GAMMA RAYS IN RICE (Oryza sativa L.).

2008 ◽  
Vol 33 (10) ◽  
pp. 7011-7025
Author(s):  
A. Abd Allah ◽  
A. El-Ekhtyar ◽  
W. El Khoby ◽  
S. Shehata ◽  
A. Abd El Lateef
Keyword(s):  
Oryza Sativa ◽  
Genetic Variability ◽  
Gamma Rays ◽  
Quantitative Traits ◽  
Oryza Sativa L

scholarly journals EFFECT OF MUTAGENS ON QUANTITATIVE CHARACTERS IN M3 GENERATION OF PEARL MILLET (PENNISETUM TYPHOIDES (BURN.F) STAPF. AND C.E. HUBB.)

1970 ◽  
pp. 01-05
Author(s):  
K. Ambli, L. Mullainathan
Keyword(s):  
Pearl Millet ◽  
Gamma Rays ◽  
Quantitative Traits ◽  
Ethyl Methane Sulphonate ◽  
Ethyl Methane ◽  
Quantitative Characters ◽  
Methane Sulphonate ◽  
Weight Yield ◽  
Number Of Leaves ◽  
Higher Doses

A study was conducted to estimate the effects of gamma rays and ethyl methane sulphonate (EMS) on mutagenesis of Pearl millet. Gamma rays (10, 20 and 30kR) and EMS (20, 30 and 40mM) treatments were done to find out different quantitative traits viz., Days to first bloom, Plant height, Number of leaves, Number of nodes, Length of earhead, Breadth of earhead, 1000 grains weight, Yield per plant, Chlorophyll and carbohydrate content. These parameters were better in 20kR of gamma rays and 30mM of EMS when compared with the control and other doses/concentrations and higher doses decreased the parameters.

scholarly journals Induced Genetic Variability for Quantitative Traits in Pigeonpea

2020 ◽  
Author(s):  
S. M. Sangle
Keyword(s):  
Genetic Variability ◽  
Gamma Rays ◽  
Quantitative Traits ◽  
Control Plant ◽  
Ethyl Methane Sulphonate ◽  
Plant Populations ◽  
Ethyl Methane ◽  
Mean Values ◽  
Quantitative Characters ◽  
Methane Sulphonate

Seeds of two pigeonpea varieties namely BDN 708 and BSMR 853 were treated with Gamma rays, ethyl methane sulphonate (EMS) and Sodium azide (SA). The treated as well as control plant populations were screened to study the induced variability for quantitative characters. Positive shift in mean values for number of primary branches per plant was observed except 0.10% EMS in variety BSMR 853 and BDN 708 in M2 generation. The effect of all the mutagenic treatments on pods per plant revealed statistically significant negative as well as positive shifts in mean values in BSMR 853 in M2 and M3 generations.

scholarly journals Variabilitatea caracterelor biomorfologice la mutantul calcaroides de orz de primăvară în generațiile M3-M7

2021 ◽  
Author(s):  
Tatiana Grigorov ◽  
Keyword(s):  
Plant Height ◽  
Analysis Of Variance ◽  
Gamma Rays ◽  
Quantitative Traits ◽  
Spike Length ◽  
Mutant Form ◽  
Mean Values ◽  
Condi Tions ◽  
Spike Number ◽  
The Mean

The variability of quantitative traits (plant height, spike length, apical internode length, number of spikelets and grains per spike, number of productive tillers per plant) in barley calcaroides mutant of cv. Sonor induced by gamma rays (250 Gy) has been studied. The analysis of variance showed that year condi-tions were mainly responsible (10.59 to 46.96%) for variation of studied traits, followed by the genotype (1.48 to 20.5%) and the interaction of these factors (1.94 to 8.64%), with only one exception for number of grains per spike. Variation of this trait depends mostly on genotype factors. The mean values of all studied traits of mutant form were lower than of Sonor variety. This morphological mutant has a scientific importance.

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