Variações no conteúdo de amido e açúcares nas corolas de café (Coffea arabica L.) durante a floração
Palavras-chave:
indução floral, quebra dormência, crescimento metabólico, teor amido, peso frescoResumo
Sugar and starch content on the dry weight basis increased in the corollas of coffee, during the period from the ending of bud dormancyto about four days before flower opening. During the last four days of growth up to anthesis, starch content decreased sharply, while the sugar content rose faster than previouly, to fall only at anthesis. Reducing sugars ac- counted for most of the sugars present in the corolla. The growth of corollas of coffee, after the termination of dormancy, comprises apparently two metabolic phases, one associated with starch accumulation, and another associated with starch degradation. Water content increases markedly during the first phase, bud swelling and anthesis coincide with the second phase.
Referências
ALVIM, P. de T. Estimulo de la floration y fructificacién del cafeto por aspersiones con acido giberelico. Tur- rialba, 8:64-72. 1958.
[autor não informado]. Moisture stress as a requirement for flowering of coffee. Science, 132:354. 1960.
[autor não informado]. Physiology of growth and flowering in coffee. Coffee, Tu ialba, 2:58-62. 1960.
FRANCO, C.M. Fotoperiodismo em cafeeiro, C. arabica L. Rev. Inst. Café, Sao Paulo, 27(164)1586-1592. 1940.
GOLDSCHMIDT, E.E. The auxin induced curvature of Citrus petals. Plant Physiol., 43:1973-1977. 1968.
[autor não informado] & MONSELISE, S.P. Citrus petals bioassay based on indoleacetic acid effects of flowering opening. Nature, 212:1064-1065. 1966.
HASSID, W.Z. & NEUFELD, Elizabeth F. Quantitative de- termination of starch in plant tissues. In; Methods of carbohydrate chemistry, Whistler. R.L. (ed.) New York, Academic Press, 1964. Vol. 4, p. 33-36.
HODGE, J.E. & HOFREITER, B.T. Determination of reducing sugars and carbohydrate. In: Methods in carbohydrate chemistry, Whilster,R. L. & Wolfrom, M. L. (ed. ), New York, Academic Press, 1962, Vol. 1, p. 380-394.
HORI, T. & FUJI, M. On the growth substance economy before and after flowering in each organ of Portulaca grandiflora Hook. Bot. Mag. , Tóquio, 74: 357-360. 1961.
HORIE, K. The behavior of the petals in the fading of the flower of Tradescantia reflexa. Protoplasma, 53-377--386. 1961.
McCREADY,R.M., GUGGOLZ,J., SILVIERA, V. & OWENS, H.S. Determination of starch andamylose in vegetables. Anal. Chem., 22:1156-1158. 1950.
MES, M.G.O. Studies on the flowering of Coffea arabica L. I. The influence of temperature on the initiation and growth of cofee flower buds. Portugualiae Acta Biologica (Serie A), 4(4):328-341. 1956-1957.
[autor não informado]. II Breaking the dormancy of coffee flower buds. Portugaliae Acta Biologica (Serie A), 4(4):342-356. 1956-1957.
[autor não informado]. III. Various phenomena associated withthe dormancy of coffee flower buds. Portugaliae Acta Biologica (Serie A), 5(1):25-44. 1957.
PAGACZ, E. A. Quelques considerations sur la floraison du caféier. Bull, Agricole Congo Belge Ruanda-Urundi, 50:1531-1540. 1959.
PIRINGER, A. A, & BORTHWICK, H. A. Photoperioedic response of coffee. Turrialba, 5:72-77. 1955.
PORTERES,R. Action de l'eaux, aprés periode séche, sur le déclenchement de la floraison chez Coffea arabica
VAN OVERBEEK, J. Plant hormones and regulators. Science, 152:721- 731. 1966.
WENT, F.W. The experimental control of plant growth. Walthan, Mass. , Chronica Botanica, 1957. 343 p.
