Estimation of variability parameters within ‘Mysore’ banana clones and their implication for crop improvement

Sirisena, J.A.; Senanayake, S. G. J. N.

doi:10.1016/s0304-4238(99)00094-1

Cited by 15 publications

(12 citation statements)

References 7 publications

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“…Sree Rangaswamy et al (1980) also estimated PCV and GCV in the range between 13 and 29% for bunch weight, fruit weight and stem girth in a range of dessert banana cultivars. Sirisenaa and Senanayake (2000) reported considerable PCV higher than 15% for bunch weight, average fruit weight and total fruit weight of which total fruit weight had GCV more than 10%. They also reported that estimated phenotypic coefficient was relatively greater than the genotypic coefficient of variation in magnitude for leaf width, leaf length, bunch weight, pseudostem girth, average fruit weight and number of fruit per hand.…”

Section: Discussionmentioning

confidence: 92%

Evaluation of Genetic Variation in Local and Introduced Desert Banana (<i>Musa</i> sp.) Genotypes for Morpho-physicochemical Traits

Mohammed¹,

Tsadik²,

Tsgaw³

et al. 2015

Sci. Technol. Arts Res. J.

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Article Information Knowledge of nature and magnitude of variation existing in available plant breeding materials is of great importance for successful selection of varieties for yield and other desirable traits. Therefore, this study was conducted to evaluate the genetic variation among 4 local and 11 introduced desert banana (Musa sp.) genotypes. The genotypes were planted at Dire Dawa, Eastern Ethiopia in randomized complete block design with five replications. Genetic variability components analyses were conducted considering 20 morpho-physicochemical traits. The results showed the presence of significant differences among genotypes for all traits. Phenotypic and genotypic coefficient of variations ranged from 8.95 to 52.63% and 7.2 to 48.16%, respectively, with low magnitude of differences and moderate to high for most of the traits. Heritability (H2) and genetic gain (GA) values were ranged from 14.69 to 98 and 7.4 to 81.45%, respectively, and both H2 and GA values were high and moderate for 16 traits. Fruit yield showed strong genotypic and phenotypic correlations with all growth traits and yield components with higher magnitude of genotypic correlation coefficients. Euclidean distance ranged from 2.36 to 7.6 which distinctly grouped genotypes into two clusters and five subgroups. Moreover, the local clones were more distant each other and with introduced genotypes and performed better than introduced genotypes for most of the traits including fruit yield. The study revealed the presence of genetic variation among local and introduced genotypes and most of the traits were controlled more of by genetic factors. This suggested the importance of exploiting genetic variability of local banana clones as equal to introduction and evaluation of exotic genotypes and the higher chance of increasing fruit yield through indirect selection for growth traits and yield components.

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Section: Discussionmentioning

confidence: 92%

Evaluation of Genetic Variation in Local and Introduced Desert Banana (<i>Musa</i> sp.) Genotypes for Morpho-physicochemical Traits

Mohammed¹,

Tsadik²,

Tsgaw³

et al. 2015

Sci. Technol. Arts Res. J.

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“…Os altos valores dos coeficientes de variação relatados se devem, possivelmente, à variabilidade do material genético utilizado na análise, que incluiu germoplasma ainda com alta variabilidade intra-acesso. Estudos em outras culturas demonstram que alta variabilidade dos genótipos facilita o processo de seleção de plantas superiores (Sirisena & Senanayake, 2000;Aycicek & Yildirim, 2006;Biçer & Şakar, 2008).…”

Section: Resultsunclassified

Correlações genéticas e análise de trilha para número de frutos comerciais por planta em mamoeiro

Oliveira

Lima

Lucena

et al. 2010

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi verificar como o número de frutos comerciais por planta (NFr) se relaciona com 16 características morfológicas e agronômicas do mamoeiro (Carica papaya L.). O experimento foi realizado no ano agrícola de 2008/2009, utilizando o delineamento experimental de blocos aumentados. Foram avaliados 19 genótipos não comuns (acessos de germoplasma) e 3 comuns (variedades e híbridos), em 10 repetições. As correlações entre NFr e as características morfoagronômicas do mamoeiro foram desdobradas em efeitos diretos e indiretos. Observou-se alta variabilidade nas características avaliadas. As estimativas das correlações genotípicas foram maiores do que as fenotípicas, para todas as características. O NFr foi positivo e significativamente correlacionado com número de frutos por axila (NFrAx); e negativamente com diâmetro da cavidade do fruto, espessura da polpa, peso, comprimento (CFr) e diâmetro do fruto. Entretanto, a análise de trilha demonstrou que, entre essas características, NFrAx e CFr possuem maior efeito direto sobre NFr. Além disso, as características altura da planta, número de flores por pedúnculo e largura da folha são de mais fácil mensuração e manifestam-se antes da produção de frutos, o que as torna mais indicadas para a seleção indireta em programas de melhoramento genético dessa cultura.Termos para indexação: Carica papaya, características morfoagronômicas, componentes da produção, melhoramento genético, seleção indireta. Genetic correlation and path analysis for the number of commercial fruit per plant in papayaAbstract -The objective of this work was to determine how the number of commercial fruit per plant (CFrP) is related to 16 morphological and agronomical traits in papaya (Carica papaya L.). The experiment was carried out in the 2008/2009-crop season, using an augmented randomized block design. Nineteen non-common (germplasm accessions) and three common genotypes (varieties and hybrids) were evaluated with ten repetitions. Correlations between CFrP and morpho-agronomic traits were outspread in direct and indirect effects. High variability was found for the evaluated traits. The estimates of genetic correlations were higher than phenotypic correlations for all characters. CFrP was positively and significantly correlated with number of fruits per axil (NFAx) and negatively with the internal diameter of the cavity of the fruit, pulp thickness, fruit weight, fruit length (FrL) and fruit diameter. However, path analysis showed that, among this traits, NFAx and FrL have more direct effect on CFrP. Furthermore, plant height, number of flowers per peduncle and leaf width are more easily measured and are expressed before fruit production, making them more suitable for indirect selection in breeding programs of this crop.

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“…Os valores obtidos foram mais concordantes quanto às características de rendimento, com menor variação nas estimativas do tamanho de parcela, em comparação às características vegetativas, o que se justifica pelo fato de as características de rendimento serem altamente correlacionadas (Sirisena & Senanayake, 2000;Tenkouano et al, 2002;Lima Neto et al, 2003), apresentarem associação genética e elevada herdabilidade, pois, os caracteres avaliados fazem parte do próprio cacho.…”

Section: Resultsunclassified

“…Determinaramse, ainda, a diferença detectável entre médias de tratamentos (d), pela equação de Hatheway (1961), e o índice de heterogeneidade (b) de Smith (1938).…”

Section: Methodsunclassified

Estimativas de tamanho de parcelas para avaliação de descritores fenotípicos em bananeira

Donato

Siqueira

Silva

et al. 2008

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi estimar o tamanho adequado de parcelas experimentais, para avaliação de descritores fenotípicos em bananeira, a partir de um ensaio de uniformidade com a cultivar Tropical, no espaçamento de 3x2 m, em área útil com nove fi leiras de 40 plantas. Foram avaliados: altura da planta; perímetro do pseudocaule; número de fi lhos emitidos e número de folhas vivas, no fl orescimento e na colheita; peso do cacho e das pencas; número de pencas e de frutos; peso da segunda penca; e peso, comprimento e diâmetro do fruto, em dois ciclos de produção. As plantas, consideradas unidades básicas, foram combinadas para formar diferentes tamanhos de parcelas. Os dados foram submetidos à análise de variância em modelo hierárquico. O tamanho da parcela foi estimado pelos métodos da máxima curvatura, máxima curvatura modifi cado e comparação de variâncias. Determinaram-se o índice de heterogeneidade do solo e a diferença detectável entre médias de tratamentos. A variabilidade aumentou entre os ciclos, com refl exos nos tamanhos de parcela, que variaram com o método utilizado, a variável avaliada e o ciclo de produção. O método da máxima curvatura modifi cado apresenta estimativas mais ajustadas. Parcelas com seis unidades básicas (36 m²) são apropriadas para avaliar, com precisão, os descritores fenotípicos em bananeira.Termos para indexação: Musa spp., estatística agrícola, morfologia, produção. Estimates of plot size for the evaluation of phenotipics descriptors in bananaAbstract -The aim of this work was to estimate the adequate size of experimental plots, for the evaluation of phenotypic descriptors in banana, from a trial of uniformity with the cultivar Tropical, in the spacing of 3x2 m, in a useful area with nine rows of 40 plants. The following variables were evaluated: plant height; pseudostem perimeter; number of emitted suckers and number live leaves, during fl owering and at harvest; weight of the bunch and the hands; number of hands and fruits; weight of the second hand; weight, length and diameter of the fruit, in two cycles of production. The plants, considered the basic units, were combined to form various sizes of plots. The data were submitted to the analysis of variance in the hierarchical model. Plot size was estimated by the methods of maximum curvature, modifi ed maximum curvature and comparison of variances. Heterogeneity index of the soil and the detectable difference among treatments mean were determined. The variability increased between cycles with refl exes in the estimates of the plot sizes, which varied with the method used, the variable evaluated and the production cycle. The modifi ed maximum curvature method presents more adjusted estimates. Plots with six basic units (36 m²) are appropriate to evaluate with precision the phenotypic descriptors in the bananas.

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Estimation of variability parameters within ‘Mysore’ banana clones and their implication for crop improvement

Cited by 15 publications

References 7 publications

Evaluation of Genetic Variation in Local and Introduced Desert Banana (<i>Musa</i> sp.) Genotypes for Morpho-physicochemical Traits

Evaluation of Genetic Variation in Local and Introduced Desert Banana (<i>Musa</i> sp.) Genotypes for Morpho-physicochemical Traits

Correlações genéticas e análise de trilha para número de frutos comerciais por planta em mamoeiro

Estimativas de tamanho de parcelas para avaliação de descritores fenotípicos em bananeira

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