Efeito de substratos na aclimatização de plantas micropropagadas do porta-enxerto de ameixeira Marianna 2624

Diferentes substratos foram estudados durante a aclimatização de plantas micropropagadas do porta-enxerto de ameixeira Marianna 2624 (Prunus sp.). O experimento foi conduzido durante 78 dias, em casa de vegetação, na Embrapa Clima Temperado, Pelotas-RS. Os tratamentos consistiram de quatro substratos, nas seguintes misturas (v/v): casca de arroz carbonizada: solos: esterco (2:1:1); casca de arroz carbonizada:Plantmax© (1:3); casca de arroz carbonizada:húmus (l:3) e casca de arroz arbonizada:húmus:solo (2:2:l). Em geral, as mudas crescidas nos substratos casca de arroz carbonizada: húmus e casca de arroz carbonizadas: Plantmax© apresentaram as maiores porcentagens de sobrevivência, número de folhas, comprimento da parte aérea e da raiz e matérias fresca e seca da parte aérea e da raiz.The effect of different substrates on the acclimatization of in vitro propagated Marianna 2624 plum rootstock was studied. The work was conducted during 78 days in a greenhouse at Embrapa Temperate Climate, in Pelotas (RS-Brazil). The treatments consisted of four mixtures of substrates (v/v): caxbonized rice bulls: soil: manure (2:1:l); carbonized rice hulls: Plantmax© (l:3); carbonized zice hulls: humus (1:3) and caxbonized rice hulls: humus: soil (2:2:l). ln general, the glantlets grew in the substrate carbonized rice bulls: humus and caxbonized rice bulls: Plantmax© had the best survival percentage, the plantlet height and root length, number of leaves and fresh and dry matter of aerial part and root

Adaptability and stability of fruit set and production of peach trees in a subtropical climate

Brazilian peach breeding programs have been established to improve peach [Prunus persica (L.) Batsch] production, yield consistency, quality, and disease resistance. Every year several genotypes are selected and their traits must be assessed. This study aimed to evaluate adaptability and stability of fruit set and production of peach genotypes in a subtropical climate, using the GGE biplot methodology. The experimental design was completely randomized with three replicates (trees) in a factorial arrangement of 29 × 3 for genotype and growing season, respectively. The genotypes 'Conserva 1129', 'Rubimel', 'Kampai', 'Tropic Beauty', and 'Cascata 967' had the greatest adaptability and stability for fruit set. The genotypes 'Conserva 681', 'Santa Áurea', 'Atenas', 'Kampai', 'Cascata 962', 'Tropic Beauty' and 'Cascata 967' had the greatest production adaptability and stability. The GGE-biplot methodology classified the peach tree genotypes with regard to adaptability and stability of fruit set and production