Análise da variabilidade genética de variedades tradicionais de arroz (Oryza sativa L.) através de marcadores moleculares microssatélites.

Este trabalho teve como objetivo avaliar a variabilidade genética através de marcadores moleculares SSR em uma amostra de variedades tradicionais oriundas de coletas, conduzidas entre os anos de 1978 e 1996, em lavouras de pequenos agricultores no Brasil

New loci of Lychnophora ericoides and transferability to Lychnophora pinaster, endangered medicinal species from Brazil

Lychnophora ericoides and Lychnophora pinaster are species used in popular medicine as analgesic or anti-inflammatory agents to treat contusions, rheumatism, and insect bites. In this study, 21 simple sequence repeat loci of L. ericoides were developed and transferred to L. pinaster. Three populations of L. ericoides and 2 populations of L. pinaster were evaluated; they were collected in the State of Minas Gerais. Population parameters were estimated, and the mean values of observed and expected heterozygosity were 0.297 and 0.408 (L. ericoides) and 0.228 and 0.310 (L. pinaster), respectively. Greater genetic variability was observed within populations than between populations of L. ericoides (62 and 37%) and L. pinaster (97 and 2.8%). These results provide information for genetic conservation and taxonomic studies of these endangered species. Lychnophora ericoides and Lychnophora pinaster are species used in popular medicine as analgesic or anti-inflammatory agents to treat contusions, rheumatism, and insect bites. In this study, 21 simple sequence repeat loci of L. ericoides were developed and transferred to L. pinaster. Three populations of L. ericoides and 2 populations of L. pinaster were evaluated; they were collected in the State of Minas Gerais. Population parameters were estimated, and the mean values of observed and expected heterozygosity were 0.297 and 0.408 (L. ericoides) and 0.228 and 0.310 (L. pinaster), respectively. Greater genetic variability was observed within populations than between populations of L. ericoides (62 and 37%) and L. pinaster (97 and 2.8%). These results provide information for genetic conservation and taxonomic studies of these endangered species1341087810882sem informaçã

Estrutura genética de populações silvestres de Oryza glumaepatula em três biomas brasileiros utilizando marcadores microssatélites.

Oryza glumaepatula, uma das 21 espécies silvestres do gênero Oryza, no qual está incluído o arroz cultivado (O. sativa), constitui uma valiosa fonte doadora de alelos favoráveis para características de interesse agronômico desta espécie. Diversas áreas de ocorrência natural de O. glumaepatula estão sob ameaça de devastação e, desta forma, a implementação de estratégias de conservação destes recursos genéticos a partir de estudos de genética de populações é de extrema relevância. Marcadores moleculares microssatélites, ou SSR, são uma ferramenta útil para investigar questões relacionadas ao sistema de cruzamento, fluxo gênico e estrutura genética das populações naturais de O. glumaepatula. Este trabalho objetivou caracterizar a variabilidade genética e estimar os parâmetros populacionais de 30 populações de O. glumaepatula provenientes de três biomas brasileiros, através do uso de dez marcadores microssatélites.bitstream/CNPAF/21788/1/bolpesq_5.pd

Análise de associação genômica ampla (GWAS) para tolerância à seca em feijoeiro comum.

O objetivo deste estudo foi identificar locos genéticos associados à tolerância à seca através da análise de associação genômica ampla (GWAS).CONAF

Do linden trees kill bees? Reviewing the causes of bee deaths on silver linden (Tilia tomentosa)

For decades, linden trees (basswoods or lime trees), and particularly silver linden (Tilia tomentosa), have been linked to mass bee deaths. This phenomenon is often attributed to the purported occurrence of the carbohydrate mannose, which is toxic to bees, in Tilia nectar. In this review, however, we conclude that from existing literature there is no experimental evidence for toxicity to bees in linden nectar. Bee deaths on Tilia probably result from starvation, owing to insufficient nectar resources late in the tree's flowering period. We recommend ensuring sufficient alternative food sources in cities during late summer to reduce bee deaths on silver linden. Silver linden metabolites such as floral volatiles, pollen chemistry and nectar secondary compounds remain underexplored, particularly their toxic or behavioural effects on bees. Some evidence for the presence of caffeine in linden nectar may mean that linden trees can chemically deceive foraging bees to make sub-optimal foraging decisions, in some cases leading to their starvation