Allelopathic potential of root exsudates of lupine

• Grant number: 17/09164-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): July 01, 2017
• Effective date (End): June 30, 2018
• Field of knowledge: Agronomical Sciences - Agronomy - Crop Science
• Principal Investigator: Pedro Luis da Costa Aguiar Alves
• Grantee: Wendy Linares Colombo
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

Among the crops with potential for use as cover is that of lupine, which is an oleaginous belonging to the genus Lupinus, which is also widely used in ruminants and humans for its high protein content, as well as oil content and Nutraceutical properties. Given these characteristics, its production and demand has been increasing. In the winter harvests of 2014 and 2016, two projects were developed in the Laboratory of Weeds (LAPDA) of the FCAV-UNESP, Jaboticabal, the first of which corresponded to Weed interference periods in the lupine crop (FAPESP case nº 2014 / 25579-4) and the second to the Effect of nitrogen fertilization on weed interference periods in the lupine crop. With the conduction of the tests it was possible to observe visually that after the germination of the lupine crop, the weeds presented stagnation in the development and there was no interference of these in the culture, a phenomenon that can be attributed to the root exudates of the lupine with allelopathic properties. The objective of this study was to evaluate the allelopathic potential of Lupinus albus in the control of spiny pigweed (Amaranthus deflexus), fireplant (Euphorbia heterophylla), urochloa brizantha (Brachiaria brizantha) and guinea grass (Panicum maximum). The exudates will be collected during 60 days using the hydroponic method and bottles in inverted position, and will be applied at different concentrations in these target plants and test (cytotoxicity and phytotoxicity experiments), in order to verify the allelopathic potential. Also the plant method will be used in coexistence for 60 days, in boxes with and without root interference. For the three experiments the experimental design will be the completely randomized, with five replicates per treatment. Germination characteristics, dry biomasses and lengths of shoot and root, leaf area, relative total chlorophyll content and quantum efficiency of photosystem II will be evaluated. The results obtained will be submitted to analysis of variance by the F test and the means compared by the Tukey test at 5% probability. (AU)