RESUMEN
In rice there are few genetic studies reported for allelopathy traits, which signify the ability of plants to inhibit or stimulate growth of other plants in the environment, by exuding chemicals. QTL analysis for allelopathic traits were conducted with 98 F8 RILs developed from the cross between the high allelopathic parents of 'Sathi' and non-allelopathic parents of 'Nong-an'. The performance of allelopathic traits were evaluated with inhibition rate on root length, shoot length, total length, root weight, shoot weight, and total weight of lettuce as a receiver plant. With 785 polymorphic DNA markers, we constructed a linkage map showing a total of 2489.75 cM genetic length and 3.17 cM of average genetic distance between each adjacent marker. QTL analysis detected on QTL regions on chromosome 8 responsible for the inhibition of shoot length and inhibition of total length. The qISL-8 explained 20.38% of the phenotypic variation for the inhibition on the shoot length. The qITL-8 explained 14.93% of the phenotypic variation for the inhibition on total length. The physical distance of the detected QTL region was 194 Kbp where 31 genes are located.
Asunto(s)
Alelopatía/genética , Cromosomas de las Plantas/genética , Oryza/genética , Sitios de Carácter Cuantitativo/genética , Mapeo Cromosómico , Ligamiento Genético/genética , Marcadores Genéticos/genética , Fenotipo , Raíces de Plantas/genéticaRESUMEN
Church attendance is associated with improved health and well-being among older adults, but older adults with functional limitations may have difficulty attending church services. This article examines differences in the association between functional limitations and church attendance in a sample of 987 elderly African American and white individuals. African American and white elderly people without limitations attended church at virtually the same rate (69 percent). Despite their higher scores on religiousness measures, elderly African Americans with one or more limitations were significantly less likely to attend church regularly than were white counterparts. Health status measures did not help explain older African Americans' lower attendance rates. Differences in attendance were associated primarily with educational attainment and cognitive functioning. The article recommends social work intervention to reduce barriers to church attendance for older adults who want to attend services.