Resumo

LALLANA, Víctor Hugo; MICHEL, Analía  e  GARCIA, Luz Fabiola. Flowering, fructification and seed production in plants of Polystachya concreta (Jacq.) Garay y H.R. Sweet (Orquidaceae). Investig. Agrar. [online]. 2019, vol.21, n.1, pp.65-72. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2019.junio.65-72.

Polystachyaconcreta (Orchidaceae) is an epiphytic herbaceous plant, found in Salta, Jujuy, Corrientes and Misiones (Argentina).The objective of the work was to evaluate in P. concreta a) the flowering andfruiting,b) seeds production (number and mass) and c) its viability.Two groups of plants (I and II) were taken from in vitro culture with 21 and 26 months from germination respectively, acclimated and cultivated in greenhouse in plastic containers with organic substrate and others mounted on stick with Sphagnum moss. The two groups of plants were evaluated separately in terms of flowering and fruiting, but the measurements in seeds (morphological characteristics and physical determinations with digital images)and their viability (Technique of tetrazolium)were made with random samples of all the fruits harvested as a whole. The percentage of flowering was of 84 and 60% (January-February) and that of fruiting of 75 and 44% (May-June), for group I and II, respectively.The plants, coming from seeds, reached first flowering in 42 months. The average mass of seeds per fruit was 0.19 ± 0.11 mg and the average number of seeds per mg was estimated at 1770 ± 628. Fruit production was high and with a high percentage of viable seeds (93%).

Palavras-chave : Polystachya concreta; fruits; physical dimension of seeds; viability.

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