Abstract

NAIZAQUE, Jeison; GARCIA, Gustavo; FISCHER, Gerhard  and  MELGAREJO, Luz Marina. RELATIONSHIP BETWEEN STOMATAL DENSITY, TRANSPIRATION AND ENVIRONMENTAL CONDITIONS IN PINEAPPLE GUAVA (Acca sellowiana [O. BERG] BURRET). rev.udcaactual.divulg.cient. [online]. 2014, vol.17, n.1, pp.115-121. ISSN 0123-4226.

Pineapple guava is a plant with a high adaptation to environmental conditions of the Andean region. Although there exists an increased national and international demand, there are many physiological aspects that still need to be known. This study aimed to evaluate the transpiration rate, the density of stomata, and the associated environmental factors in the upper and lower stratum of the tree crown of the pineapple guava crop in Tibaná municipality (Boyacá, Colombia), under open air conditions. Measurements were made of leaf temperature, transpiration rate, irradiance and relative humidity (RH) in two strata during 7 daily hours (8:00, 9:00, 10:00, 11:00, 12:00, 13:00 and 14:00 h). The upper stratum showed a higher transpiration rate and a major average number of stomata, 91/mm² vs. 78/mm² in the lower stratum. Leaf transpiration increased directly with increasing temperature (more in the upper stratum than in the lower stratum) and with the irradiance; while transpiration increased as the relative humidity decreased.

Keywords : Stomata; irradiance; relative humidity; temperature; crown stratum.

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