Estudo de alguns eventos do florescimento do cafeeiro relacionados a fatores do ambiente / Study of some coffee tree flowering events related to environmental factors.

AUTOR(ES)

Marilza Neves do Nascimento

DATA DE PUBLICAÇÃO

2006

RESUMO

The coffee tree flowering involves several events related with the factors of plant and environmental characteristics. A better comprehension on the flowering events and the relations among those factors can improve the knowledge in cropping practices, mainly in irrigation techniques, aiming to promote the homogeneity on the flowering and, consequently, on the maturation of the fruits in order to minimize costs. Based in these facts this paper aimed to associate environmental factors with morphological alterations on the flower buds of coffee trees as well as connect prolin and abscisic acid synthesis with the diverse flowering events of irrigated and non-irrigated coffee. Scanning electron microscopy analyses had been performed in buds collected every week from november/04 to feburary/05 in plagiotropic shoots. Predawn leaf water potential and proline content analyzes were performed from july to september/05 using mature leaves from plagiotropic shoots of the higher third of irrigated and non-irrigated trees. The abscisic acid content was evaluated on the xylem sap and on flower buds. The results showed modifications in the bud structure in december what could be correlated with a period of water deficit followed by precipitation and also a lower thermal amplitude. Differences in the leaf water potential could be observed among the irrigation treatments with values around â0,3 and â0,8 MPa for irrigated plants and â0,6 and â1,5 MPa for non-irrigated plants. The highest values of proline and abscisic acid content were observed in dryer periods, nevertheless it was not verified a direct relation between flowering phases and the biosynthesis of these compounds in coffee tree.

ASSUNTO(S)

Ãcido abscÃsico morfologia da gema prolina estresse hÃdrico floral induction proline fisiologia vegetal abscisic acid water stress induÃÃo floral bud morphology

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