Selection of Descriptors in a Morphological Characteristics Considered In Cassava Accessions By Means Of Multivariate Techniques

Afonso, S.; Lêdo, Carlos Alberto da Silva; Moreira, Roger William Fernandes; Silva, Sebastião de Oliveira e; Leal, Von Daniken de Jesus; Conceição, António Leandro da Silva

doi:10.9790/2380-07151320

Cited by 10 publications

(16 citation statements)

References 2 publications

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“…In this study, the first two principal components explained 31.18% of the total cumulative variance for the qualitative traits. This result is similar with those of Afonso et al (2014) who found 32.56% of the genetic variance in the first factorial plane. It can also be explained by the fact that the variance distribution is associated with the nature and number of characters used in the analysis and focuses on the first principal components.…”

Section: Discussionsupporting

confidence: 91%

Genetic characterization of cassava (Manihot esculenta Crantz) genotypes using agro-morphological and single nucleotide polymorphism markers

Karim

Ifie

Dzidzienyo

et al. 2019

Physiol Mol Biol Plants

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Dearth of information on extent of genetic variability in cassava limits the genetic improvement of cassava genotypes in Sierra Leone. The aim of this study was to assess the genetic diversity and relationships within 102 cassava genotypes using agro-morphological and single nucleotide polymorphism markers. Morphological classification based on qualitative traits categorized the germplasm into five different groups, whereas the quantitative trait set had four groups. The SNP markers classified the germplasm into three main cluster groups. A total of seven principal components (PCs) in the qualitative and four PCs in the quantitative trait sets accounted for 79.03% and 72.30% of the total genetic variation, respectively. Significant and positive correlations were observed between average yield per plant and harvest index (r = 0.76***), number of storage roots per plant and harvest index (r = 0.33*), height at first branching and harvest index (0.26*), number of storage roots per plant and average yield per plant (r = 0.58*), height at first branching and average yield per plant (r = 0.24*), length of leaf lobe and petiole length (r = 0.38*), number of leaf lobe and petiole length (r = 0.31*), width of leaf lobe and length of leaf lobe (r = 0.36*), number of leaf lobe and length of leaf lobe (r = 0.43*), starch content and dry matter content (r = 0.99***), number of leaf lobe and root dry matter (r = 0.30*), number of leaf lobe and starch content (r = 0.28*), and height at first branching and plant height (r = 0.45**). Findings are useful for conservation, management, short term recommendation for release and genetic improvement of the crop.

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Section: Discussionsupporting

confidence: 91%

Genetic characterization of cassava (Manihot esculenta Crantz) genotypes using agro-morphological and single nucleotide polymorphism markers

Karim

Ifie

Dzidzienyo

et al. 2019

Physiol Mol Biol Plants

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“…Therefore, aiming at reducing inconsistencies in the elimination of descriptors, the adoption of two procedures is common to indicate the most relevant descriptors. For example, Afonso et al (2014), and Castro et al (2012) employed the same direct selection criteria proposed by Jolliffe (1972Jolliffe ( , 1973 and Singh coeficiente to select morphoagronomic descriptors for Manihot esculenta Crantz and yellow passion fruit, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Multivariate analysis are useful tools to identify the more informative and the less relevant descriptors in the characterization and evaluation of a germplasm to be used in genetic improvement programs, since it supplies information to exclude descriptors that represent little contribution to the total variation (Cruz, Carneiro, & Regazzi, 2004). The use of more than one procedure to discard redundant characters has been adopted to provide higher security to the selection of descriptors (Castro, Neves, Jesus, & Oliveira, 2012;Afonso et al, 2014;E. Oliveira, F. Oliveira, & Santos, 2014;Silva, Carvalho, & Duarte, 2013;Silva et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Selection of Morphoagronomic Descriptors in Physalis angulata L. Using Multivariate Techniques

Silva¹,

Passos²,

Schnadelbach³

et al. 2018

JAS

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This study aimed at selecting determinant morphoagronomic descriptors to characterize and evaluate Physalis angulata L. germplasm. Twelve quantitative and twenty-two qualitative descriptors were analyzed in six accessions of P. angulata coming from the physalis germplasm collection belonging to the State University of Feira de Santana-BA. The selection and discharge of quantitative descriptors was based on the direct selection and on the Singh method, while qualitative descriptors were analyzed through entropy. The statistic analyses were carried out using the GENES and R programs. Ten quantitative descriptors were excluded through direct selection and five through the Singh method. However, only four descriptors were considered redundant by both methods: east-west fruit, weight of five ripe fruits, width of leaf blade and total soluble solids. Although the total soluble solids descriptor was appointed for discharge, it was included in the group of descriptors selected due to its importance in the characterization of physalis fruit. The list of minimum descriptors to describe physalis accessions comprised 15 descriptors: plant height, stem diameter, north-south fruits, number of fruits per plant, leaf blade length, internode length, fruit longitudinal length, fruit transversal length, total soluble solids, growth habit, stem color, leaf margin shape, unripe calyx color, unripe fruit shape and color. These were nine quantitive and six qualitative descriptors, respectively. The discharge of 55.88% of the descriptors did not cause significant loss of information and might allow the reduction of time and resources spent to characterize and evaluate physalis germplasm.

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“…Afonso recently reported an experiment to characterize 200 accessions from EMBRAPA's Cassava Germplasm Active Bank (BAGM, Brazil) using 35 morphological and agronomic descriptors [1]. Importantly, 20 characters are found to be important in the classification of germplasm of manioc, eleven of those being quantitative descriptors and nine qualitative.…”

Section: Resultsmentioning

confidence: 99%

Morphological characterization and classification of cassava (Manihot esculenta Crantz) in Vietnam

Chu

Quynh²,

Hien³

et al. 2016

V J Bio

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ABSTRACT:The aim of this study was to establish the morphological basis for the classification of major cassava cultivars (Manihot esculenta Crantz) planted in Vietnam. Twenty typical descriptors were observed in various specific growth stages. Four traits related to mature leaves and two traits related to leaf veins were detected in cassava plants after the 4-month stage. At the same time, 12 root-and stem-related descriptors were collected in cassava plants from 8 months old to harvest. We found that two traits in the apical leaves can be observed in every growth stage. A classification tree based on these traits was constructed with 6 essential morphological descriptors to recognize the 7 most common cassava cultivars in Vietnam. KM 140 variety is distinguished by purplish-red in apical leaves, while KM 98-7 can be classified with straight or linear shapes of central leaflet. The irregular orientation of the petiole is a unique descriptor of local cultivar XVP. In the case of SM 937-26, weak foliar scars are observed. Finally, KM 94, KM 419, and KM 98-5 varieties can be classified by the color of the stem epidermis. These morphological descriptors will be a foundation to classify all cassava varieties planted in Vietnam.

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Selection of Descriptors in a Morphological Characteristics Considered In Cassava Accessions By Means Of Multivariate Techniques

Abstract: An experiment was conducted to determine the selection of morphological descriptors in

Cited by 10 publications

References 2 publications

Genetic characterization of cassava (Manihot esculenta Crantz) genotypes using agro-morphological and single nucleotide polymorphism markers

Genetic characterization of cassava (Manihot esculenta Crantz) genotypes using agro-morphological and single nucleotide polymorphism markers

Selection of Morphoagronomic Descriptors in Physalis angulata L. Using Multivariate Techniques

Morphological characterization and classification of cassava (Manihot esculenta Crantz) in Vietnam

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