A set of descriptors for evaluating guayule germplasm

Coffelt, T. A.; Johnson, L. D.

doi:10.1016/j.indcrop.2010.04.004

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…More than 1000 morphological markers have been identified in barley ( Hordeum vulgare ) (Dhanapal & Govindaraj, 2015). A set of descriptors for Jatropha curcas and guayule ( Parthenium argentatum Gray) were also developed based on the germplasm collected around India by Sunil et al (2013) and Coffelt and Johnson (2011), respectively.…”

Section: Discussionmentioning

confidence: 99%

Identification of diverse agronomic traits in chickpea (Cicer arietinum L.) germplasm lines to use in crop improvement

et al. 2022

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A chickpea (Cicer arietinum L.) collection consisting of 445 Kabuli-type collected from different locations of Iran was evaluated based on six qualitative and 14 quantitative morphological descriptors. Chickpea accessions were widely varied in plant height, the number of pods per plant, plant dry weight, 100-grain weight, grain yield, and harvest index. Grain yield was positively correlated with the number of pods per plant (r = 0.39 ** ), pod fertility percentage (r = 0.42 ** ), dry weight per plant (r = 0.88 ** ), and harvest index (r = 0.30 ** ). The highest value for the Shannon-Weaver diversity index was observed in growth habit (0.98) and leaf color (0.88). The first and second components of the principal component analysis (PCA) explained 17.97% and 16.20% of the total variations, respectively. The cluster analysis results revealed that the accessions with higher pod, leaflet, and peduncle length were grouped in cluster I, whereas cluster II indicated the dominant contribution for the number of pods per plant, plant dry weight, and grain yield. The highest phenotypic coefficient of variation (PCV) and genotypic coefficient of variation (GCV) were observed for grain yield per plant (44.3% and 48.3%), the number of pods per plant (44.3% and 45.1%), and dry weight per plant (44.4% and 44.8%). The heritability estimates were also more significant for the number of pods per plant, plant dry weight, and harvest index. These accessions might be used in the chickpea breeding programs to expand high-yielding Kabuli-type cultivars with a broad genetic base.

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Section: Discussionmentioning

confidence: 99%

Identification of diverse agronomic traits in chickpea (Cicer arietinum L.) germplasm lines to use in crop improvement

et al. 2022

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“…Although the definition of descriptors of greater importance has been made based on the experience of researchers (Coffelt & Johnson, 2011), the use of multivariate analysis techniques have been more effective in identifying descriptors of major interest, indicating the disposal of those less relevant descriptors (Strapasson et al, 2000;Giraldo et al, 2010;Castro et al, 2012;Oliveira et al, 2012;Silva et al, 2013). Besides, multivariate analyses, specifically the multiple correspondence analysis (MCA), have the advantage of assessing the importance of each studied descriptor in the total available variation among accessions, enabling the discard of the less discriminating descriptors which are invariant or correlated with other descriptors, similarly to the principal component analysis.…”

Section: Introductionmentioning

confidence: 99%

Selection of the most informative morphoagronomic descriptors for cassava germplasm

Oliveira

Filho

Santos

2014

Pesq. agropec. bras.

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-The objective of this work was to select the most informative morphoagronomic descriptors for cassava (Manihot esculenta) germplasm and to evaluate the ability of different methods to select the descriptors. Ninety-five accessions were characterized using 51 morphoagronomic descriptors. Data were subjected to a multiple correspondence analysis (MCA), whose information was used in the following four methods of descriptor selection: reverse order of the descriptor for the pth factorial axis of the MCA (Jolliffe); sequential, multiple correspondence analysis (SMCA); mean of the contribution orders of the descriptor in the first three factorial axes (C3PA); and C3PA method weighted by the respective eigenvalues of the full analysis (C3PAWeig). The correlations between the dissimilarity matrix with all descriptors and the most informative descriptors were high and significant (0.75, 0.77, 0.83, and 0.84 for C3PAWeig, C3PA, SMCA, and Jolliffe, respectively). The less informative descriptors were discarded, considering those common among the selection methods and relevant for the breeding interests. Therefore, 32 morphoagronomic descriptors with correlation between the dissimilarity matrices (r=0.81) were selected, due to their high capacity to discriminate cassava germplasm and to their ability to maintain some preliminary agronomic traits, useful for the initial characterization of the germplasm. Index terms: Manihot esculenta, descriptor selection, genetic resources, multiple correspondence analysis. Seleção dos descritores morfoagronômicos mais informativos para germoplasma de mandiocaResumo -O objetivo deste trabalho foi selecionar os descritores morfoagronômicos mais informativos para o germoplasma de mandioca (Manihot esculenta), e avaliar a capacidade de diferentes métodos em selecionar os descritores. Foram caracterizados 95 acessos com uso de 51 descritores morfoagronômicos. Os dados foram submetidos à análise de correspondência múltipla (ACM), cujas informações foram utilizadas nos seguintes quatro métodos de seleção de descritores: ordem inversa do descritor para o eixo fatorial pth da ACM (Jolliffe); análise de correspondência múltipla sequencial (ACMS); média das ordens de contribuição do descritor nos três primeiros eixos fatoriais (C3PE); e método C3PE ponderado pelos pesos dos respectivos autovalores da análise completa (C3PEPond). As correlações entre a matriz de dissimilaridade com todos os descritores e os descritores mais informativos foram altas e significativas (0,75, 0,77, 0,83 e 0,84 para C3PEPond, C3PE, ACMS e Jolliffe, respectivamente). Os descritores menos informativos foram descartados, tendo-se considerado apenas aqueles comuns entre os métodos de seleção e relevantes para os interesses do melhoramento. Assim, foram selecionados 32 descritores morfoagronômicos com correlação entre as matrizes de dissimilaridade (r=0,81), em razão de sua alta capacidade para discriminar o germoplasma de mandioca e de sua habilidade de manter alguns caracteres agronômicos preliminares, úteis para a...

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