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The role of jasmonic acid and gibberellins in plant ontogeny with special regard to fruit development
Jasmonic acid (JA) and its analogues attracted the interest of plant physiologists through its widespread occurrence within the plant kingdom, as effective promoters of senescence and as endogenous factors of plant development involved in different physiological processes. This paper deals with the...
Jasmonic acid (JA) and its analogues attracted the interest of plant physiologists through its widespread occurrence within the plant kingdom, as effective promoters of senescence and as endogenous factors of plant development involved in different physiological processes. This paper deals with the possible role of these compounds at different stages of plant ontogeny. The attention is directed to the germination process and growth of seedlings, to the growth and senescence of vegetative organs, as well as to the reproductive stages of development, especially to fruit formation. The gibberellins (GAs) seem to be involved in the regulation of fruit set. Investigations in Carica papaya showed that the very active GAs A1 and A3 were dominant in young developing fruits, while GA55 and a neutral GA3 conjugate were the major components in yellow fruits destined for abscission. The occurrence of low active GAs in abscising fruits seems to be connected with the physiological processes leading to the abscission.
