Resumo

FLOREZ RONCANCIO, Víctor Julio  e  ALEIXO PEREIRA, Maria de Fátima. ABSCISIC ACID SPEED UP FLORAL DEVELOPMENT OF SOLIDAGO UNDER SHORT DAYS. Rev. Fac. Nac. Agron. Medellín [online]. 2009, vol.62, n.1, pp.4835-4841. ISSN 0304-2847.

Solidago x luteus (M.L. Greene) Broulliet & Semple (= x Solidaster hybridus, x S. luteus) is a plant that respond to short days (SD) for flower development. In this process, there has been established the involvement of many phytohormones, between these, the presence of the abscisic acid (ABA) in zones and specific periods during flower development, suggests its promoter roll on the floral anthesis period of this species under SD. In this work new indications of the relationship between phytohormones present in the acid fraction and flowering process were explored. In the first assay, leaf extracts of plants under long days (LD) (characterized by slower time of floral anthesis), were applied in flower buds of plants under short days (characterized by speeding up floral anthesis). On the whole, eight applications were carried out with different frequencies summarizing a treatment period of 25 days. The results showed that the substances present in the extracts of the acid fraction do not alter the time of floral anthesis in the flower buds of plants kept in SD; likewise, was confirmed a longer time for floral anthesis in plants control under LD. In the second assay, the ELISA quantification allowed to establish higher concentrations of ABA in leaf and flower buds extracts of plants under SD and in flower buds at the beginning of the treatments. These results confirm the relation of ABA with speeding up floral anthesis in Solidago x luteus plants kept in SD conditions.

Palavras-chave : Solidaster; floral development; abscisic acid; ELISA.

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