Variabilidade genética de acessos de tomateiro (Lycopersicon esculentum Mill.) com base na avaliação de fotossíntese, partição de fotoassimilados e produção / Genetic variability of tomato (Lycopersicon esculentum Mill.) accesses on the basis of the evaluation of the photosynthesis, partition of photoassimilates and production

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The genetic variability of nine accesses of tomato (Lycopersicon esculentum Mill.) of indeterminate type, of the Vegetable Germplasm Bank of the Viçosa Federal University was evaluated for photosynthetic capacity (A), dry matter, partitioning dry matter and yield, having been used as standard of the cultivating tomato the Santa Clara cultivar. The experiment was lead in protecting environment and favorable conditions of the irrigation, nutrition and temperature requirements, in randomized complete block design, with 10 treatments and 5 repetitions. It was measured photosynthesis with analyzer of gas for infra-red ray, LI-6400, between 51 and 56 days before of the transplanting (DBT). To the 83 DAT and in the end of the productive cycle (EPC), IAF was determined. In EPC the dry mass of the fruits, leaves, roots and shoots was gotten for drying in dryer equipment to 75C until constant weight. The partitioning index of leaves, shoot, root and fruit had been calculated that the reason between dry matter of each part and the dry matter total and expresses in relative values. The data had been submitted analyze of variance (F; p<0,01), test of Tukey (p<0,05) and Pearson correlation (r) using statistical software SAEG 9. The results had shown to genetics significant variability (test F, p<0,01) for all the evaluated characteristics. Was determined too, that not exist correlation between A, dry matter total and yield, but IAF correlated negatively with A. The assimilate partitioning to vegetative part competes strong with the one of the fruits. This showed that are possible to have productive plants with small IAF to the ones of the current tomato cultivate, if to combine high A and harvest index, being allowed to visualize one another ideotype of plants that demand little resources for similar unit of plant with current productivity cultivar. Promising accesses for favorable characteristics of the evaluated had been identified.

ASSUNTO(S)

partição de fotoassimilados accesses genetic variability acessos photosynthesis variabilidade genética fitotecnia fotossíntese tomate tomato partition of photoassimilates

ACESSO AO ARTIGO

Documentos Relacionados