Genetic diversity in populations of Brazil nut

Coelho, Lucyanna Moura; Lopes, Maria Teresa Gomes; Chagas, Edvan Alves; Pio, Rafael; Pasqual, Moacir; Neto, Pedro de Queiroz Costa; Magalhães, Magna Aragão

doi:10.1590/1984-70332017v17n4a57

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…Genetic integrity refers to the original genetic composition of germplasm resources. The protection of genetic integrity refers to the maintenance of the complete genetic structure of germplasm populations in the process of reproduction, regeneration or long-term conservation 1 , 2 . Changes in the genetic integrity of germplasm refer to the gradual loss of genetic integrity with the decrease of seed germination rate and viability during storage, including the differential differentiation between the progeny populations and the parent populations of germplasm resources after reproduction and regeneration 3 .…”

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confidence: 99%

Identification and analysis of the genetic integrity of different types of rice resources through SSR markers

Zhou

Jin

et al. 2023

Sci Rep

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Seed aging is the key factor leading to the loss of genetic integrity. In this study, the seeds of Dongxiang wild rice, Xianggu, 9194 and Nipponbare were kept in a plant incubator with constant temperature and humidity for artificial aging treatment. The genetic integrity of germplasm resources with different germination gradients were analyzed using 44 SSR markers. The results suggested that different accessions could be ranked in order of aging resistance from highest to lowest as common wild rice > Xianggu > 9194 > Nipponbare. In order to maintain the genetic diversity of rice, the population size for reproduction and regeneration should be between 60 and 140. After aging, the number of polymorphic alleles, the number of specific single plant, the ratio of polymorphic bands, the number of alleles, the number of effective alleles, gene diversity index and Shannon index of different accessions all decreased with the decrease of germination rate. The germination rate of 60% was the critical value to maintain genetic integrity. Besides, the genetic integrity of eighteen SSR markers was rapidly lost or significantly increased. The regions of these markers were closely related to seed viability or genetic integrity. This study provides a theoretical basis for determining the population size for reproduction and regeneration and the critical value of germination rate of rice resources.

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Section: Introductionmentioning

confidence: 99%

Identification and analysis of the genetic integrity of different types of rice resources through SSR markers

Zhou

Jin

et al. 2023

Sci Rep

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Sapucaia nut: Morphophysiology, minerals content, methodological validation in image analysis, phenotypic and molecular diversity in Lecythis pisonis Cambess.

Rosa

Araújo

Kamke

et al. 2020

Food Research International

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Bertholletia excelsa SEEDS IN THE CERRADO-AMAZON TRANSITION REGION: MORPHOMETRY, COLORIMETRY, VIABILITY, AND GERMINATION

Souza

Borella

Silva

et al. 2023

NAT

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The objective of this study was to describe morphometric characteristics of fruits and seeds and evaluate the viability and germination of seeds of Bertholletia excelsa stored on litterfall and under similar microenvironmental conditions to those found in their natural habitat, in a Cerrado-Amazon transition area, Brazil. The morphometric characterization consisted of measurements of diameters and latitudinal and longitudinal circumferences of fruits, exocarp and mesocarp thickness, fruit and seed weights per fruit, number of seeds per fruit, and seed thickness, width, and length. Seed moisture content was determined by the ratio between the fresh and dry weights. Colorimetric characterization was performed for mesocarp, outer and inner seed coats, and internal part of the seeds. Seed viability was evaluated using the tetrazolium test and germination was evaluated using intact seeds without seed coat. Morphometric variability was found for fruits and seeds of B. excelsa, regardless of the air humidity. Fruit color and seed outer coat color changed as the relative air humidity decreased. Variations in relative air humidity during the storage period resulted in a significant decrease (45.31%) in seed moisture content and compromised of the seed physiological quality, decreasing seed viability and germination capacity. B. excelsa seeds are sensitive to variations in air humidity. Storing seeds inside the fruit on litterfall and under similar microenvironmental conditions to their natural habitat for up to 96 days under mean relative air humidity above 65% ensures the maintenance of seed moisture above the critical level (30%). Viable seeds with germination potential present moisture contents above 45%. Keywords: Amazon Rainforest; forest residues; recalcitrance; Brazil nut conservation; extractivism. Sementes de Bertholletia excelsa na transição Cerrado-Amazônia: morfometria, colorimetria, viabilidade e germinação RESUMO: Este estudo objetivou descrever as características morfométricas dos frutos e sementes, e, avaliar a viabilidade e germinação das sementes da B. excelsa armazenadas sob a serapilheira em condições microambientais do seu habitat natural na transição Cerrado-Amazônia brasileira. A caracterização morfométrica incluiu medidas de diâmetros e circunferências latitudinal e longitudinal dos frutos; espessura do exocarpo e do mesocarpo, massa dos frutos e das sementes por fruto, número de sementes por fruto, espessura, largura e comprimento das sementes. A umidade das sementes foi obtida pela razão entre massas. A caracterização colorimétrica ocorreu no mesocarpo, tegumento externo e interno e na parte interna da semente. A viabilidade das sementes foi avaliada pelo teste de tetrazólio e a germinação com sementes destegumentadas e intactas. Observou-se variabilidade morfométrica dos frutos e sementes da B. excelsa independentemente da umidade. A cor do fruto e do tegumento externo da semente mudaram de tonalidade com a redução da umidade relativa do ar. As variações da umidade relativa do ar durante o período de armazenamento influenciaram na redução expressiva de 45,31 % no teor de água das sementes e comprometeu a qualidade fisiológica, diminuindo a viabilidade e capacidade de germinação das sementes. As sementes da B. excelsa são sensíveis as variações de umidade. O armazenamento das sementes dentro do fruto sob a serapilheira em condições microambientais do seu habitat natural por até 96 dias com umidade relativa do ar média acima de 65 %, garante a manutenção da umidade das sementes acima da umidade crítica de 30 %. Sementes viáveis e com poder germinativo apresentam teor de água acima de 45 %. Palavras-chave: Floresta Amazônica; resíduos florestais; recalcitrância; conservação da castanha do Brasil; extrativismo.

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Genetic diversity in populations of Brazil nut

Cited by 3 publications

References 12 publications

Identification and analysis of the genetic integrity of different types of rice resources through SSR markers

Identification and analysis of the genetic integrity of different types of rice resources through SSR markers

Sapucaia nut: Morphophysiology, minerals content, methodological validation in image analysis, phenotypic and molecular diversity in Lecythis pisonis Cambess.

Bertholletia excelsa SEEDS IN THE CERRADO-AMAZON TRANSITION REGION: MORPHOMETRY, COLORIMETRY, VIABILITY, AND GERMINATION

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