Characterization of type and genetic diversity among soybean cyst nematode differentiators

Matsuo, Éder; Sediyama, Tuneo; Oliveira, Rosangela D'arc De Lima; Cruz, Cosme Damião; Oliveira, Rita de Cássia Teixeira

doi:10.1590/s0103-90162012000200010

Cited by 9 publications

(9 citation statements)

References 5 publications

(5 reference statements)

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“…Pest, disease and weed control is not generally responsible for considerable yield gaps, but the excessive use of agrochemicals reduce financial income and environmental quality; however, attention should be given to the increasing nematode problems in soybean fields, which are hard control (Matsuo et al . 2012), as well as stink bugs, caterpillars ( Chrysodeixis includens ), weeds ( Conyza bonariensis; Digitaia insularis ) and Asian rust ( Phakopsora pachrhizi ).…”

Section: Resultsmentioning

confidence: 99%

The soybean yield gap in Brazil – magnitude, causes and possible solutions for sustainable production

et al. 2015

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Brazil is one of the most important soybean producers in the world. Soybean is a very important crop for the country as it is used for several purposes, from food to biodiesel production. The levels of soybean yield in the different growing regions of the country vary substantially, which results in yield gaps of considerable magnitude. The present study aimed to investigate the soybean yield gaps in Brazil, their magnitude and causes, as well as possible solutions for a more sustainable production. The concepts of yield gaps were reviewed and their values for the soybean crop determined in 15 locations across Brazil. Yield gaps were determined using potential and attainable yields, estimated by a crop simulation model for the main maturity groups of each region, as well as the average actual famers' yield, obtained from national surveys provided by the Brazilian Government for a period of 32 years . The results showed that the main part of the yield gap was caused by water deficit, followed by sub-optimal crop management. The highest yield gaps caused by water deficit were observed mainly in the south of Brazil, with gaps higher than 1600 kg/ha, whereas the lowest were observed in Tapurah, Jataí, Santana do Araguaia and Uberaba, between 500 and 1050 kg/ha. The yield gaps caused by crop management were mainly concentrated in South-central Brazil. In the soybean locations in the mid-west, north and northeast regions, the yield gap caused by crop management was <500 kg/ha. When evaluating the integrated effects of water deficit and crop management on soybean yield gaps, special attention should be given to Southern Brazil, which has total yield gaps >2000 kg/ha. For reducing the present soybean yield gaps observed in Brazil, several solutions should be adopted by growers, which can be summarized as irrigation, crop rotation and precision agriculture. Improved dissemination of agricultural knowledge and the use of crop simulation models as a tool for improving crop management could further contribute to reduce the Brazilian soybean yield gap.

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Section: Resultsmentioning

confidence: 99%

The soybean yield gap in Brazil – magnitude, causes and possible solutions for sustainable production

et al. 2015

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“…This method has been used in studies involving quantification of the genetic variability between individuals, both in plants (Gouvêa et al, 2010;Rajamanickam & Rajmohan, 2010;Gorji & Zolnoori, 2011;Leão et al, 2011;Matsuo et al, 2012) and animals (Barbosa et al, 2005). Descriptions for the clustering process with Tocher's method can be found in the work of Sharma (2006) and Cruz et al (2011).…”

Section: Introductionmentioning

confidence: 99%

A cophenetic correlation coefficient for Tocher's method

Silva

Dias

2013

Pesq. agropec. bras.

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-The objective of this work was to propose a way of using the Tocher's method of clustering to obtain a matrix similar to the cophenetic one obtained for hierarchical methods, which would allow the calculation of a cophenetic correlation. To illustrate the obtention of the proposed cophenetic matrix, we used two dissimilarity matrices -one obtained with the generalized squared Mahalanobis distance and the other with the Euclidean distance -between 17 garlic cultivars, based on six morphological characters. Basically, the proposal for obtaining the cophenetic matrix was to use the average distances within and between clusters, after performing the clustering. A function in R language was proposed to compute the cophenetic matrix for Tocher's method. The empirical distribution of this correlation coefficient was briefly studied. For both dissimilarity measures, the values of cophenetic correlation obtained for the Tocher's method were higher than those obtained with the hierarchical methods (Ward's algorithm and average linkage -UPGMA). Comparisons between the clustering made with the agglomerative hierarchical methods and with the Tocher's method can be performed using a criterion in common: the correlation between matrices of original and cophenetic distances.Index terms: cluster analysis, optimization methods, clustering consistency. Um coeficiente de correlação cofenética para o método de TocherResumo -O objetivo deste trabalho foi propor uma forma de uso do método de Tocher para obtenção de uma matriz análoga à matriz cofenética obtida para métodos hierárquicos, o que permitiria o cálculo de uma correlação cofenética. Para ilustrar a obtenção da matriz cofenética proposta, foram utilizadas duas matrizes de dissimilaridade -uma obtida com a distância quadrada generalizada de Mahalanobis e outra com a distância euclidiana -entre dezessete cultivares de alho, com base em seis caracteres morfológicos. Basicamente, a proposta para obtenção da matriz cofenética foi a de usar, após a realização do agrupamento, as distâncias médias intra e intergrupos. Uma função em linguagem R foi proposta para computar a matriz cofenética para o método de Tocher. A distribuição empírica desse coeficiente de correlação foi estudada de forma sucinta. Para as duas medidas de dissimilaridade, os valores do coeficiente de correlação cofenética obtidos para o método de Tocher foram superiores aos obtidos com os métodos hierárquicos (algoritmo de Ward e ligação média -UPGMA). Comparações entre agrupamentos feitos com os métodos hierárquicos aglomerativos e com o método de Tocher podem ser realizadas com o uso de um critério em comum: o da correlação entre matrizes de distâncias cofenéticas e originais.Termos para indexação: análise de agrupamento, métodos de otimização, consistência do agrupamento.

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“…CD spectra have been extensively used to estimate and monitor the structural changes of proteins due to temperature, denaturants or binding interactions for decades . The CD spectrum of LvPBP75 showed a slight loss of structured secondary elements compared with rLvPBP75 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…This change may be due to the influences of protein concentration, buffer system, temperature of measurement and instrument differences . Another possible explanation for the change in CD spectra between LvPBP75 and rLvPBP75 is that it probably reflects the increase in conformational flexibility of hemocyanin gained by the hydrophobic residues associated with ATX binding . The binding ratio of rLvPBP75 and ATX was calculated to be 0.346 based on their molar mass, which means that 1 mol L −1 ATX could bind with 26 kDa protein.…”

Section: Resultsmentioning

confidence: 99%

“…35 Another possible explanation for the change in CD spectra between LvPBP75 and rLvPBP75 is that it probably reflects the increase in conformational flexibility of hemocyanin gained by the hydrophobic residues associated with ATX binding. [33][34][35] The binding ratio of rLvPBP75 and ATX was calculated to be 0.346 based on their molar mass, which means that 1 mol L −1 ATX could bind with 26 kDa protein. This is in accordance with previous studies on crustacyanin subunits, where about 1 mol L −1 ATX was combined with 22 kDa protein.…”

Section: Construction and Structural Properties Of Artificial Lvpbp75mentioning

confidence: 99%

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Functional and structural properties of red color‐related pigment‐binding protein from the shell of Litopenaeus vannamei

et al. 2018

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Characterization of type and genetic diversity among soybean cyst nematode differentiators

Cited by 9 publications

References 5 publications

The soybean yield gap in Brazil – magnitude, causes and possible solutions for sustainable production

The soybean yield gap in Brazil – magnitude, causes and possible solutions for sustainable production

A cophenetic correlation coefficient for Tocher's method

Functional and structural properties of red color‐related pigment‐binding protein from the shell of Litopenaeus vannamei

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