Construção de uma coleção nuclear de arroz para o Brasil

Abadie, T.; Cordeiro, Célia Maria Torres; Fonseca, J. R.; Alves, Rosa de Belém das Neves; Burle, M. L.; Brondani, C.; Rangel, P. H. N.; Castro, Emilio; Silva, Heloisa Torres da; Freire, Marlene Silva; Zimmermann, F. J. P.; Magalhães, J. R.

doi:10.1590/s0100-204x2005000200005

Cited by 24 publications

(22 citation statements)

References 3 publications

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“…However, the limited number of accessions used in each group must be taken into account, as discussed in the following. In general, higher variability has been reported within groups with flint than within groups with dent grain in the core and base collections (Abadie et al 2000, Netto et al 2004), but in this study the variability within the dent group was more pronounced. This may have been caused by the nature of the character, since in most studies aimed at quantifying the genetic divergence neutral characters are considered and in the present study, we focused on agronomically relevant traits.…”

Section: Resultscontrasting

confidence: 57%

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Evaluation of maize core collection for drought tolerance

Teixeira

Gomide

Albuquerque

et al. 2010

Crop Breed. Appl. Biotechnol.

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-The maize genebank (GBmaize) preserves nearly 4,000 accessions for conservation and use. The use is however restricted because the accessions do not perform as well as the elite genotypes. This problem can be reduced by prebreeding, i.e., by extending the information on germplasm and introgressing useful alleles. Since irregular rainfall distribution and drought induce maize yield losses, drought tolerance is a main breeding target. In this study, the GBmaize accessions were evaluated for drought tolerance. Environmental factors, genotypes and the respective interactions influence the phenotypic expression. There was however no interaction genotype -irrigation level, so no accessions with different performance under the two water regimes could be identified. The performance of the following accessions was promising for a number

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Section: Resultscontrasting

confidence: 57%

“…The core collection consists of accessions representing the variability of the entire collection with a limited number of entries (Abadie et al 2000). It was therefore expected that the divergence between these accessions were high.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of maize core collection for drought tolerance

Teixeira

Gomide

Albuquerque

et al. 2010

Crop Breed. Appl. Biotechnol.

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“…Esta intensidade de amostragem (5%) fica próxima à empregada por Abadie et al (2005) para a formação de uma coleção nuclear de arroz (5,6%). Contudo, é inferior à apresentada por Brown (1989), que corresponde a 10% dos acessos da coleção inicial.…”

Section: Resultsunclassified

“…Grande importância tem sido dada, atualmente, à obtenção de coleções nucleares, existindo coleções para arroz (Abadie et al, 2005), batata (Chandra et al, 2002), cevada (Liu et al, 1999), entre outras.…”

Section: Introductionunclassified

Estratégias de amostragem e estabelecimento de coleções nucleares

Vasconcelos

Cruz

Bhering

et al. 2007

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a influência da intensidade de amostragem, do tamanho da coleção de germoplasma inicial e da variância da amostragem sobre a qualidade das respectivas coleções nucleares, quanto à representatividade das coleções iniciais. Foram simulados sete tamanhos de coleções iniciais e utilizadas seis intensidades de amostragem para estabelecimento de coleções nucleares, utilizando caracteres morfoagronômicos. Determinaram-se o número de grupos formados, o coeficiente de coincidência entre a coleção nuclear e a coleção inicial e o coeficiente de determinação dos acessos amostrados para comporem a coleção nuclear. Também foi proposto o uso de uma estratégia alternativa para estabelecer coleções nucleares, de forma a maximizar a diversidade entre os acessos. O tamanho da coleção inicial influencia a intensidade de amostragem empregada na obtenção da coleção nuclear. A amostragem de acessos pelo método de Tocher, com critério de aglomeração inverso, mostrou-se eficiente na obtenção de coleções nucleares. As diferentes magnitudes de variância das coleções iniciais não influenciaram os coeficientes de determinação (R 2 ) nem os coeficientes de coincidência entre a coleção inicial e as respectivas coleções nucleares.Termos para indexação: coleção de germoplasma, coleção nuclear, intensidade de amostragem, coeficiente de coincidência, método de Tocher. Strategies for sampling and establishment of core collectionsAbstract -The objective of this work was to evaluate the effect of sampling intensity, initial collection's size and its variance over the quality of the respective core collections, in terms of representation of the initial collections. Therefore, simulations were performed for seven sizes of the initial collections and six sampling intensities for the establishment of core collections were used, comprising morpho-agronomic traits. Groups formed were determined, as well as the coincidence coefficient between the core and the initial collection, and the determination coefficient of the accessions sampling to compose the core collection. The use of an alternative strategy was proposed to establish core collections, this strategy maximizes the diversity among the accessions. The size of initial collections affects the sampling intensity to be used to obtain a core collection. The selection of accessions with the method of Tocher, comprising criteria of inverse grouping, was efficient for the formation of the core collections. The different magnitudes of variance of the initial collections did not affect either the coefficient of determination (R 2 ) or the coincidence rate between initial collections and respective core collection.

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“…No Brasil, existem coleções núcleos de várias espécies, como a Coleção Núcleo de Arroz, formada por 550 acessos (ABADIE et al, 2005) e a de trevobranco, composta por 75 acessos (BORTOLINE et al, 2006), entre outras.…”

Section: Introductionunclassified