Performance of inbred and outbred Eucalyptus spp. clones in the nursery and in the field. / ComparaÃÃo do desempenho no viveiro e no campo dos descendentes de clones de Eucalyptus spp. autofecundadados e cruzados

AUTOR(ES)

Regiane Abjaud Estopa

DATA DE PUBLICAÇÃO

2006

RESUMO

Inbred and outbred Eucalyptus clones were assessed aiming to check a possible loss of vigor in the initial germination phases and growing in the nursery and in the field. It was also verified in the field the frequency of abnormal plants, with reduced growing and wrinkled leaves. A morphological or molecular character was searched in the nursery, which would allow to identify as early as possible, the abnormal plants. Offspringâs two commercial clones were assessed as inbreds (C01 and C02) and as hybrids (C01 x C03 and C02 x C03). The work consisted of two phases. The first one was conduced in the nursery, in a completely random design, with 4 treatments and 6 replications, in plots with 30 tubes with only one seed. The second one, in the field, used a randomized complete block design, with 4 treatments and 6 replications, with 18 plants per plots. The percentage of germination, germination speed index, survival and plant height were assessed at 35, 50, 65 and 80 days in the nursery. In the field, the survival percentage at 6 months and plant height at 2, 4 and 6 months were evaluated. DNA from normal and abnormal plant leaves were isolated. Molecular markers associated with plants with abnormal development, were searched. Using 639 RAPD primers. Germination, survival and plant growth resulted from inbreds were similar to the hybrids, showing that possibly the loss of vigor is not expressive at the early developmental stage characters of the eucalyptus. The occurrence of abnormal plants was 6.9 % between inbred plants and 4.6% between hybrid plants. No morphological or molecular markers were identified in the nursery, which would make possible the early recognition of abnormal plants. The character has variable expressivity, which makes difficult the segregation study.

ASSUNTO(S)

autofecundaÃÃo hÃbridos. inbred genetica e melhoramento florestal endogamia germination eucalyptus spp. eucalyptus spp. germinaÃÃo inbreeding hybrids.

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