Comportamento germinativo, armazenamento de sementes e tolerância ao alumínio da mamoneira

Abstract

The castor bean (Ricinus communis L.) is an oilseed prominent economical because the oil extracted from its seeds has prospects for use in various products. However, the collection of information about this species will germination, seed storage, and tolerance to aluminum toxicity is greatly reduced. The objective of this work was to study on the germination and storage of seeds and evaluate the behavior of this species by aluminum toxicity. The seeds of castor five strains were subjected to germination tests on two types of germination (B.O.D. chambers and germinator Mangelsdorf model) and two types of substrates (sand and roll paper germitest type). It was concluded both favored germination germination in the species, though the sand substrate is indicated by the present best result. For the experiment of castor seed storage for 22 months three types of packaging (Kraft paper bag, plastic bag and pot polyethylene) were used and tested three strains. It was found that the seeds of castor maintain viability up to 16 months, depending on the strain and packaging. The packaging in plastic bag provides greater assurance of force in any lineage. Tolerance to aluminum toxicity were tested in 30 strains of castor on hydroponically using nutrient solutions containing 30 mg L-1 of aluminum which can separate the lines assessed in four groups of tolerant and sensitive to aluminum toxicity. UFRB 46 and 151 UFRB lines show greater recovery of root growth after the stress of Al in hydroponic conditions.