Resumo

TOVAR-ROCHA, Violeta; ROCHA-GRANADOS, Ma. del Carmen  e  DELGADO-VALERIO, Patricia. Influence of fruit ripening of Arbutus xalapensis kunth on the germination of seeds and zigotyc embryos. Polibotánica [online]. 2014, n.37, pp.79-92. ISSN 1405-2768.

The aim of this study was to determine the effect of fruit ripeness of in vitro germination of seeds and zygotic embryos of Arbutus xalapensis Kunth. Fruits were collected from 10 trees in each of the two study sites and were classified according to their size and weight in 10 states into three groups characterized by the color of the fruit: 1 to 6 dark green fruits (DGF), 7 and 8 yellow-green fruits (YGF) and 9 and 10 orange-red fruits (ORF). 50 seeds of each state were selected and placed on MS medium to evaluate their germination. The experiment was repeated two times and the results were submitted to Tukey's analysis of mean comparison which indicated that the three groups have different characteristics related to fresh weight and diameter (P ≤ 0.05), with an average of 6.3 g and 0.21 mm for DGF, 9.5 g and 0.46 mm for YGF and 10.8 g and 0.70 mm for ORF. The stereomicroscopic analysis showed that all states have seed maturation and embryos; states one to four embryos have developed, and in the states 5 to 10, fruits contain a greater number of seeds with embryos developed and higher germination (7.6 to 8.8). Therefore, is proposed the use of ripening fruit from stages 5 to 10 for right germination of seeds of strawberry tree, while for zygotic embryos is necessary to carry out studies of culture media for its germination.

Palavras-chave : classification of fruit; embryos; germination; strawberry tree; microscopy; seeds.

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