VARIABILITY AND HERITABILITY ESTIMATE OF 30 RICE LANDRACES OF LAMJUNG AND TANAHUN DISTRICTS, NEPAL

The variability in the rice landraces is the source of variation and offers substantial opportunity for the development of new varieties through the selection. Exploring diversity and variability of landraces is utmost for rice improvement. The objective of the study was to assess diversity indices, magnitude of genetic variability, heritability, genetic advance for the yield, and yield contributing traits. An experiment was carried out in alpha-lattice with 30 landraces, two replications in the Agronomy farm of IAAS, Lamjung Campus, during June-November, 2018. Shannon and Simpson's indices were calculated for 18 qualitative traits. The value of the Shannon and Simpson index ranged 0.15-1.41 and 0.07- 0.75, respectively. Landraces showed significant variations (p<0.001) for all 13 qualitative traits studied. The higher value of the phenotypic coefficient of variation (PCV) compared to the corresponding genotypic coefficient of variation (GCV) for all the studied traits indicated the influence of the environment. The filled-grain per panicle exhibited a high estimate of PCV and GCV, followed by the effective tiller and filled grain percentage. High heritability, along with high genetic advance was found in 10 traits, including 1000 grain weight, grain length, and filled grain per panicle indicated the presence of additive gene action. Direct selection of characters of these traits based on phenotypic expression by a selection method will be more reliable for yield improvement. The study suggests that the existence of diversity and estimated genetic parameters among landraces of rice that can be exploited in future rice breeding programs.

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Genetic variability analysis for various yield attributing traits in rice genotypes

Journal of the Bangladesh Agricultural University ◽

10.3329/jbau.v15i1.33525 ◽

2017 ◽

Vol 15 (1) ◽

pp. 15-19

Author(s):

MM Rashid ◽

M Nuruzzaman ◽

L Hassan ◽

SN Begum

Keyword(s):

Genetic Variability ◽

Coefficient Of Variation ◽

Block Design ◽

Direct Selection ◽

Genetic Advance ◽

Randomized Complete Block Design ◽

Additive Gene ◽

High Heritability ◽

Rice Genotypes ◽

Selection For

An experiment was conducted using a randomized complete block design to estimate genetic variability of ten rice genotypes. Analysis of variance for yield and yield contributing traits showed significant (p<0.01) variation among the genotypes. Results of genetic analyses showed a higher phenotypic coefficient of variation compared to their corresponding genotypic coefficient of variation for all the traits measured, which indicates that the traits were influenced by environment. The magnitude of difference between phenotypic coefficient of variance (PCV) and genotypic coefficient of variance (GCV) was less for the traits indicating little influence of environment. The higher estimates of PCV and GCV were observed for number of filled grains panicle1 (27.53; 26.84), number of unfilled grains panicle1 (26.76;25.28) and plant height (23.14; 23.00) indicates possibility of genetic improvement through direct selection for these traits, while days to 50% flowering, days to maturity, panicle length, number of effective tillers plant1, fertility (%), 1000 Seed weight and yield panicle1 showed low PCV and GCV values indicating the need for creation of variability by hybridization or mutation followed by selection. High heritability values (>60%) along with high genetic advance and genetic advance as percentage of mean were found for all the traits indicating prevalence of additive gene action, which provides good scope for further improvement by selection.J. Bangladesh Agril. Univ. 15(1): 15-19, January 2017

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Co-efficient of variation, heritability, genetic advance and variability for ricebean (Vigna umbellata (Thunb.) genotypes under mid hill conditions of Uttarakhand

Journal of Applied and Natural Science ◽

10.31018/jans.v7i2.685 ◽

2015 ◽

Vol 7 (2) ◽

pp. 794-798

Author(s):

Geeta Pandey ◽

Rajendra Prasad ◽

Birendra Prasad ◽

Priyamvada Chauhan

Keyword(s):

Seed Yield ◽

Coefficient Of Variation ◽

Genetic Variance ◽

Direct Selection ◽

Genetic Advance ◽

Vigna Umbellata ◽

Additive Gene ◽

High Heritability ◽

Pod Length ◽

100 Seed Weight

The present investigation was carried out to estimate the genetic parameters for ten traits in ricebean genotypes. Fourteen genotypes of ricebean (Vigna umbellata (Thunb.) were collected from different regions of country were evaluated for yield and its components. The study revealed that the phenotypic coefficient of variation (PCV) was higher than genotypic coefficient of variation (GCV) for all traits. The value of PCV and GCV was higher for seed yield/plant, 100 seed weight and number of pods/plant. Heritability values were high for all the traits except leaflet size and pod length. High genetic advance was observed for days to 50% flowering, number of pods and seeds /plant, days to maturity, suggest that scope for improvement of these characters through selection. High heritability coupled with high genetic advance was registered for 50% flowering, number of pods and seeds /plant indicate that the genetic variance for these traits are probably owing to their high additive gene effect and thus there is better scope for improvement of these traits through direct selection. Therefore selection based on these characters will bring the desired improvement in seed yield of ricebean. With respect to mean performance of genotype, PRR-2, PRR-1 and PRR-2011- 1 was found superior among all the genotypes.

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GENETIC VARIATION AND SELECTION CRITERIA FOR SEED YIELD RELATED TRAITS IN RAPE SEED (Brassica napus L.)

Bangladesh Journal of Plant Breeding and Genetics ◽

10.3329/bjpbg.v26i2.23845 ◽

2015 ◽

Vol 26 (2) ◽

pp. 15-22

Author(s):

S. Parveen Parveen ◽

M. H. Rashid Rashid ◽

M. S. R. Bhuiyan

Keyword(s):

Coefficient Of Variation ◽

Seed Weight ◽

Positive Association ◽

Negative Association ◽

Genetic Advance ◽

Rape Seed ◽

Significant Positive Association ◽

Days To Maturity ◽

Additive Gene ◽

High Heritability

The field experiment was conducted to estimate the genetic variability and correlation between yield contributing traits using 15 rape seed genotypes. The results indicated that the phenotypic variance for all the characters was considerably higher than the genotypic variance denoting little influence of environmental factors on their expression. Characters like 1000-seed weight (12.39, 14.10), days to 50% flowering (18.36, 18.77) and days to maturity (4.63, 5.06) showed low genotypic and phenotypic coefficient of variation. Moderate genotypic and phenotypic coefficient of variation was observed in number of primary branches per plant (20.22, 22.16), length of siliqua (20.84, 20.97), number of seeds per siliqua (30.90, 33.06), number of siliquae per plant (49.34, 49.81) and yield per plant (34.36, 39.98) and high genotypic (67.00) and phenotypic coefficient of variation (68.57) was observed for number of secondary branches per plant. Plant height (85.98%, 30.89), 1000 seed weight (77.14%, 22.41), days to 50% flowering (95.66%, 20.35) and days to maturity (83.85%, 7.82) showed high heritability with low genetic advance which indicated the possibility of non-additive gene action. Number of primary branches per plant (83.22%, 37.99, 636.02), length of siliqua (98.83%, 42.68, 1084.42), number of seeds per siliqua (87.40%, 59.52, 424.22), number of siliqua per plant (98.15%, 100.71, 178.83) and yield per plant (73.87%, 60.84, 4539.97) showed high heritability with high genetic advance and high genetic advance in percentage of mean revealed the possibility of predominance of additive gene effects. Number of primary branches per plant had showed highly significant positive association with number of secondary branches per plant (rg=0.597, rp= 0.537) and yield per plant (rg=0.43). Days to 50% flowering showed significant positive association with seeds per siliqua (rg=0.492; rp=0.436), 1000 seed weight (rg=0.486; rp=0.472) and yield per plant (rg=0.438; rp=0.379). Length of siliqua manifested highly significant positive association with siliqua per plant (rg=0.571; rp=0.514) and significant negative association with yield per plant (-0.471) at genotypic level. Siliqua per plant had highly significant negative association at both genotypic and phenotypic level with yield per plant (-0.697; -0.525) but 1000 seed weight had highly significant positive association with yield per plant both genotypic and phenotypic level (0.893; 0.814). The results of the path analysis revealed that 1000 seed weight (0.766) had the maximum direct effect and the maximum negative direct effect was observed in seeds per siliqua (0.305). In summary, the results suggested that there were some yield related traits such as 1000 seed weight and days to 50% flowering could be selected and used in breeding program for increasing the grain yield of rapeseed.

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GENETIC VARIABILITY OF RICE GENOTYPES (Oryza sativa L.)

Bangladesh Journal of Plant Breeding and Genetics ◽

10.3329/bjpbg.v24i2.17004 ◽

2011 ◽

Vol 24 (2) ◽

pp. 31-35

Author(s):

P. C. Roy ◽

M. G. Rasul ◽

M. A. K. Mian ◽

M. A. H. Molla

Keyword(s):

Coefficient Of Variation ◽

Oryza Sativa L ◽

Phenotypic Variance ◽

Genetic Advance ◽

Environmental Variance ◽

Additive Gene ◽

High Heritability ◽

Rice Genotypes ◽

Hill Number ◽

Genotypic Coefficient Of Variation

An attempt was made to study genotypic variance, phenotypic variance, environmental variance, genotypic coefficient of variation (GCV), phenotypic coefficient of variation (PCV), heritability (h2b) and genetic advance (GA) for some rice genotypes during July 2007 to January 2009 at BSMRAU campus, Gazipur 1706. Significant variations were obtained among the genotypes for all the characters studied. Considering genetic parameters high genotypic coefficient of variation (GCV) value was observed for harvest index followed by yield per hill, number of tillers per hill, number of filled grain per panicle, whereas days to maturity showed very low GCV. High heritability with high genetic advance (GA) observed for yield per hill followed by number of tillers per hill, number of filled grains per panicle indicated that these characters were under additive gene control and selection for genetic improvement for these traits might be effective.DOI: http://dx.doi.org/10.3329/bjpbg.v24i2.17004

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Evaluation of Heritability and Genetic Advance for Morphological Traits of Indian Mustard Germplasms

Current Journal of Applied Science and Technology ◽

10.9734/cjast/2020/v39i2130820 ◽

2020 ◽

pp. 39-47

Author(s):

Dinesh Awasthi ◽

Vimlesh Kumar Tiwari ◽

V. S. Kandalkar

Keyword(s):

Seed Yield ◽

Seed Weight ◽

Harvest Index ◽

Indian Mustard ◽

Heritability Estimate ◽

Genetic Advance ◽

Additive Gene ◽

High Heritability ◽

Level Of Significance ◽

Number Of Seeds

Genotypic source of variations were significant for all characters in 168 genotypes including 7 checks of Indian mustard at 5% level of significance. Maximum seed yield per plant (g) and harvest index was recorded in MRNJ-82; whereas, the minimum days to 50% flowering and maturity were recorded in RVM-1 and MRNJ-5 respectively. In genotypes viz; MRNJ-36, RVM-2, MRNJ-59, JM-1, MRNJ-53 and MRNJ-35 had maximum plant height (cm), number of primary branches per plant, number of secondary branches per plant, number of siliqua per plant, number of seeds per siliqua and 1000 seed weight (g). Highest GCV and PCV were recorded for seed yield per plant which indicates for improvement through selection among these genotypes. High heritability along with high genetic advance as percentage of mean has been noticed for seed yield per plant and harvest index indicating less influence of environment and also the presence of additive, dominance and interaction among genes in the expressions of these characters. Low genetic advance along with low heritability estimate were observed for number of primary branches per plant and number of seeds per siliqua. This indicates the involvement of additive and non-additive gene actions in their inheritance.

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PERFORMANCE EVALUATION AND VARIABILITY ANALYSIS FOR MAJOR GROWTH AND FLOWERING TRAITS OF Lilium longiflorum THUNB. GENOTYPES

Journal of Experimental Biology and Agricultural Sciences ◽

10.18006/2021.9(4).439.444 ◽

2021 ◽

Vol 9 (4) ◽

pp. 439-444

Author(s):

Rameshwar Rai ◽

◽

Jong Hwa Kim ◽

◽

...

Keyword(s):

Performance Evaluation ◽

Coefficient Of Variation ◽

Block Design ◽

Heritability Estimate ◽

Lilium Longiflorum ◽

Breeding Scheme ◽

Flower Diameter ◽

Additive Gene ◽

The Mean ◽

Almost All

The performance evaluation and variability estimation are some of the most important basic steps in any breeding scheme and are usually taken as a pre-breeding task. This experiment was carried out to evaluate the performance and estimate the variability for major growth and flowering traits of Sixteen Lilium longiflorum Thunb genotypes in a randomized complete block design (RCBD) with three replications. The estimated analysis of variance (ANOVA) demonstrated prevailing significant variability for studied ten growth and flowering traits of all 16 genotypes. The experiment was conducted to quantify the genetic variability, heritability, and genetic advance as a percentage of the mean (GAM), for understanding the breeding potentiality of L. longiflorum genotypes based on their performance for growth and flowering traits, so that pre-breeding scheme could be executed properly. The estimated genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) value, along with heritability estimate and GAM, revealed that almost all studied traits besides flower diameter were controlled by additive gene action. For these traits, improvement would be possible through the selection after cross-breeding among these genotypes. The choice of genotypes for the hybridization scheme could be made based on the mean performance of those genotypes for the particular traits of the breeding scheme.

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ANALYSIS OF GENETIC PARAMETERS FOR BEAN PHYSICAL QUALITY CHARACTERS AND CLUSTERIZATIONS OF ELEVEN GENOTYPES OF ROBUSTA COFFEE (Coffea canephora)

Indonesian Journal of Agricultural Science ◽

10.21082/ijas.v14n2.2013.p55-62 ◽

2013 ◽

Vol 14 (2) ◽

pp. 55

Author(s):

Rubiyo Rubiyo ◽

Edi Wardiana

Keyword(s):

Coefficient Of Variation ◽

Genetic Parameters ◽

Block Design ◽

Coffea Canephora ◽

Direct Selection ◽

Genetic Advance ◽

Physical Quality ◽

Robusta Coffee ◽

Randomized Complete Block Design ◽

Genotypic Coefficient Of Variation

The genetic parameters of coffee related to their bean physical quality characters are important for breeder to improve the bean quality. Eleven genotypes of robusta coffee were identified and their genetic relationship to the bean physical quality were characterized. The research was conducted at coffee plantation of the Association of Indonesian Coffee Exporters in West Lampung, altitude of 800 m above sea level, Latosol type of soil, and A type of climate, starting from 2010 to 2012. The objectives of this study were to estimate the genotypic coefficient of variation, heritability and genetic advance of the bean physical quality characters, and clusterization analysis of eleven genotypes of robusta coffee. A randomized complete block design with eleven treatments of coffee genotypes and three replications was used in this study. The results showed that the estimated values of genotypic coefficient of variation, heritability and genetic advance for small-size normal bean characters of robusta coffee were very high, so the genetic improvement for these characters has a high probability of success by direct selection. Clusterization of the genotypes resulted three clusters with their respective characteristics. The study implies that future breeding program especially for hybridization should be conducted between genotypes arising from different clusters to obtain the possible high heterosis effects.<br /><br />

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Studies of genetic variability, heritability and genetic advance in balsam (Impatiens balsamina L.)

Journal of Applied and Natural Science ◽

10.31018/jans.v10i2.1702 ◽

2018 ◽

Vol 10 (2) ◽

pp. 810-812

Author(s):

Sumit Pal ◽

Anil Kumar Singh ◽

Akhilesh Kumar Pal ◽

Anjana Sisodia ◽

Anupam Tiwari

Keyword(s):

Coefficient Of Variation ◽

Crop Improvement ◽

Genetic Advance ◽

Gene Effects ◽

Impatiens Balsamina ◽

Additive Gene ◽

High Heritability ◽

Improvement Programme ◽

Superior Genotypes ◽

Level Of Significance

A field experiment was carried out with 34 genotypes of Balsam (Impatiens balsamina L.) to assess the variability, heritability and genetic advance with an objective to identify superior genotypes for further crop improvement programme. The experiment was conducted during rainy season 2014 at the Horticulture Research Farm, Department of Horticulture, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi. These genotypes show significant variation at 5% level of significance for different characters under study. Highest range of variation was reported with the number of flowers/plant (109-221). The phenotypic coefficient of variation (PCV) and genotypic coefficient of variation (GCV) was maximum for seed yield/plant, i.e. 29.02 and 26.34 while, minimum in case of length of leaf, i.e. 8.35 and 6.48, respectively. High heritability was observed for all the characters except plant height, width of leaves and duration of flowering. Maximum heritability was recorded for duration of flowering (90.68%) and minimum was observed in width of leaf (30.04). High heritability (h2 = 90.64) with high genetic advance (GA= 71.36) as percentage of mean was observed for number of flowers/plant, which indicated that additive gene effects were more important for that trait. High genetic advance as per cent of mean was observed for number of flowers/plant (71.36) however, lowest for floral bud diameter (0.11) which indicates the preponderance of additive genes and selection will be effective for improvement of these traits.

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Genetic variability, heritability and genetic advance studies in french bean (Phaseolus vulgaris L.) genotypes

Indian Journal of Agricultural Research ◽

10.18805/ijare.a-4923 ◽

2018 ◽

Author(s):

D R Jhanavi ◽

H B Patil ◽

P Justin ◽

Revanappa. . ◽

H. P Hadimani ◽

...

Keyword(s):

Plant Height ◽

Root Nodules ◽

French Bean ◽

Direct Selection ◽

Genetic Advance ◽

Cluster Number ◽

Gene Effects ◽

Plant Weight ◽

Science College ◽

Additive Gene

An experiment on evaluation in 36 genotypes of french bean was conducted at department of vegetable science, college of Horticulture, Bagalkot during rabi season of the year 2015-2016. The analysis of variance was significant (p=0.01) for all characters indicated higher magnitude of variability. Moderate GCV and PCV were observed for the traits plant height, number of primary branches, pod length, pod width, pod flesh thickness, number of pods / cluster, number of pods/ plant, weight of ten pods, number of root nodules/ plant, drymatter content of pods and roots. High heritability coupled with high genetic advance was recorded for the plant height, pod width, number of pods/plant, weight of ten pods, yield /plant, number of root nodules /plant, drymatter content of pods, roots and protein content. It indicated the presence of additive gene effects. Thus, there is an ample scope for improving yield and quality characters in french bean through direct selection.

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