Ciclo de crescimento dos botões florais de café (Coffea arabica L)
Palavras-chave:
botões florais, crescimento botão, quebra dormência, fotoperíodo crítico, temperatura idealResumo
The growth of flower buds of coffee under field conditions in Viçosa, Minas Gerais (Brazil) was studiedin the year of 1967. Between 74-100 buds were collected weekly for length, dry matter and fresh weight determinations.
lower initiation took place by the end of May. By mid-July, buds had attained a length of 4-5 mm. Thereafter growth stopped. On September 14, growth resumed after a rainfall of 14.3 mm. Eleven days later (one day before anthesis), buds had reached a maximum size of 11.5 mm. The period of bud dormancy extended for about two months.
Fresh weight paralleled changes in bud length, Both remained stable from mid-July through September 14 and then, after break of dormancy, increased rapidly until blooming.
Water content of buds decreased slightly during the dormancy period, dropping from 57.2% on July 7 to 54.6% before the rainfall which broke dormancy. Following the break of dormancy there was 2 rapid increase in moisture content to a maximum value of 77. 4% at anthesis.
Referências
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FRANCO, C. M. Fotoperiodismo em cafeeiro. Rev. Inst. Café, São Paulo, 15(164): 1586-1592. 1940.
Referenciado não informado. Fisiologia do cafeeiro. In: Cultura e adubação do c eiro. Sao Paulo, Inst. Brasileiro Potassa. 1965. p. 63-80.
MES, M. G. Studies on flowering of Coffea arabica L. I. The influence of temperature on the initiation and growth of coffee flower buds. Portugaliae Acta Biologica (Série A), 4(4): 328-341. 1956.
Referenciado não informado. Studies on flowering of Coffea arabica L. II. Breaking the dormancy of coffee flower buds. Portugaliae Acta Biologica (Série A), 4(4): 342-354. 1956.
Referenciado não informado. Studies on flowering of Coffea arabica L. III. Various phenomena associated with the dormancy of coffee flower buds. Portugaliae Acta Biologica (Série A), 5(1): 25-44. 1957.
PAGACZ, E. A. Quelques considerations sur la floraison du ceféier. Bull. Agric. Congo Belge, 50 (6): 1531-1540. 1959.
PIRINGER, A.A. & BORTHWICK, H. A. Photoperiodic responses of coffee. Turrialba, 5(3): 72-77. 1955.
WENT, F.W. The experimental control of plant growth. Waltham, Mass. , Chronica Botanica. 1957. p. 164-168.
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