Faculta de Química, Univ. Habana
Havana, Havana | Cuba
Primary Affiliation: Faculta de Química, Univ. Habana - Havana, Havana , Cuba
3PubMed Central Citations
J Sci Food Agric 2013 May 26;93(7):1765-71. Epub 2012 Nov 26.
Department of Applied Biology, Escuela Politécnica Superior de Orihuela (Miguel Hernández University of Elche), Ctra. Beniel Km 3.2, 03312, Orihuela, Spain.
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Plant Growth Regulation December 2012, Volume 68, Issue 3, pp 333-342
Plant Growth Regulation
The effects of spraying two brassinosteroid analogues, DI-31 and DI-100, were evaluated at concentrations of 4, 8 and 12 ppm together with a seaweed extract and amino acid mixture called Tomex Amin (2.5 l/ha) to enhance their activity. These were sprayed ten times to foliage of pepper var. Orlando grown under greenhouse conditions. Treatment with DI-31 at a dose of 12 ppm (30 mg/ha) resulted in the highest production increases, which were 13.55 % relative to the control with Tomex Amin (T02). Correlation between net photosynthesis increase and yield increase due to DI-31 treatment, which produced the maximum yield increase and also the highest net photosynthesis with significant differences with respect to the control, was observed. This increased yield was caused by an increase in pepper/plant number. The physic-chemical variables related to pepper quality, such as fresh weight, h/d ratio, lobe number/fruit, firmness, colour and ripening index, were similar in the control and treated peppers. Total antioxidant activity and phenolic content was higher in pepper treated over T02. The results showed that sprayed DI-31 may play an important role in increasing the yield of field grown pepper due to an increase in fruits number per plant without any undesirable effects on their nutritive and organoleptic properties
Estudio de toxicidad aguda por contacto del análogo de
Revista de Toxicología en Línea
DI-31 is a semi-synthetic brassinosteroid analogue obtained in the Faculty of Chemistry of the Havana University. This product improves crops yield and quality, as well as enhances plants tolerance to water and salt stresses. The goal of the present work was the evaluation of the contact toxicity of DI-31 on bees. The substance assayed was topically applied in one dose of 100 μg per bee. Two hundred bees of the Apis mellifera species were used. The appearance of signs of toxicity and the mortality at 4, 24 and 48 hours after administration were scored (OECD, 1998). The results showed that bees treated did not present any sign of toxicity derived from the product assayed. Taking into account the results from this assay, it can be concluded that toxic effects of DI-31 on Apis mellifera are unlikely.