Virgínia de Souza Álvares

Relação entre características físicas e o rendimento de polpa de maracujá-amarelo

The work was carried out in the Federal University of Vicosa (UFV), with the aim to evaluate the relations among fruit traits of the yellow passion fruit and its direct and indirect effects on fruits weight and pulp content. The evaluations had been made in the first year yield with 200 randomly sampled fruits in an essay with 42 half-sib progenies. The data were submitted to Pearsons correlation and Path coefficient analysis. The evaluated traits were: length and equatorial diameter of the fruit, weight of the fruit, weight of the rind and the pulp, thickness of the rind, pulp weight/fruit weight ratio and length/diameter ratio. Significant correlations among the traits and yield were verified. The pulp weight had greater favorable direct effect for fruit weight selection. The equatorial diameter of the fruit was better associated with the length of the fruit than with pulp weight. The selection of fruits with greater equatorial diameter makes possible the attainment of passion fruits with higher pulp contents. Correlation between pulp content and length/diameter ratio (oval fruits) were not observed.

Influence of the maturity stage and post-harvest storage in germination and initial development processes of yellow passion fruit

The passion fruit is among the main fruit crops cultivated in Brazil. The propagation is predominantly by seeds. Seeds with good quality should be collected at adequate development stage, which can be established according to the fruit maturity stage. The aim of this work was to verify the influence of the fruit maturity stage and the post-harvest storage in the germination and initial development of the seedlings of yellow passion fruit (Passiflora edulis f. flavicarpa). The work was carried out in the Federal University of Vicosa (MG), Brazil. The seeds used were extracted of fruits in three fruit maturity stages (stage 1 - green beginning to alter its fruit epidermis coloration to yellow; stage 2 - fruit with 5 until 50% yellow epidermis coloration and stage 3 - fruit with more than 50% yellow epidermis coloration), and four post-harvest storage periods (0, 3, 6 and 9 days) at room temperature. After, the seeds were sowed in plastic boxes with fine washed sand. The experiment was designed in completely randomized blocks, in a factorial 3 x 4 (maturity stage x post-harvest storage period), with four replications, where each plot was constituted by 50 seeds. It was concluded that, the yellow passion fruit seeds should be extracted at the fruit maturity stages 2 or 3. For the development process of the yellow passion fruit seedlings it was recommended to store the fruits during 3 to 6 days before the seeds extraction.

Influência de substratos na formação de porta-enxerto de gravioleira (Annona muricata L.)

A utilizacao de um substrato para cada tipo de planta e um fato importante que determina condicoes adequadas para a germinacao e bom desenvolvimento das mudas. Com o objetivo de avaliar diferentes substratos na formacao de porta-enxerto de gravioleira (Annona muricata L.), foi conduzido um experimento no Departamento de Fitotecnia da Universidade Federal de Vicosa. As mudas foram formadas em sacolas de polietileno, com delineamento experimental inteiramente casualizado com quatro tratamentos, cinco repeticoes e cinco plantas por parcela. Os tratamentos correspondem aos substratos: Plantmax®; Substrato-A (esterco de curral, solo, areia e vermiculita na proporcao de 2:1:1:1 v/v); Substrato-B (Plantmax®; solo, areia e vermiculita - 1:1:1:1 v/v) e Substrato-C (Plantmax®, esterco de curral, solo e areia - 1:1:1:1 v/v). Pelos resultados obtidos, verificou-se que, nas condicoes em que foi desenvolvido este trabalho, o substrato A contendo esterco de curral, solo, areia e vermiculita na proporcao de 2:1:1:1 v/v e o C contendo Plantmax®, esterco de curral, solo e areia - 1:1:1:1 v/v sao adequados para a formacao de mudas de gravioleira.