Qualidade de sementes de angico (Anadenanthera colubrina (Velozzo) Brenan) com uso da termoterapia

Abstract

Anadenanthera colubrina is a native tree species whose population is being reduced due to the wood extraction. There is concern about the extinction of this species, resulting in studies related to its perpetuation, as the quality of seeds. This work aimed to evaluate the quality of A. colubrina seeds collected in the states of Paraíba (PB), Pernambuco (PE) and Rio Grande do Norte (RN), Brazil, submitted to thermotherapy, via humid heat. The lots of A. colubrina seeds were recorded from nine trees matrix, located in the municipalities of São João do Cariri-PB, Boa Vista-PB, Sumé-PB, Passa e Fica-RN, São José do Campestre-RN, Nova Cruz -RN, Custódia-PE, Sertânia-PE and Arcoverde-PE. For the sanity test the treatments were control, consisting of seeds without treatment, chemical treatment (dicarboximide) and heat treatments with temperatures of 50, 60 and 70 °C for 10, 20, 30 and 40 minutes immersion. In the germination test, it was used the same treatments used for sanity test evaluating the percentage of germination, first count, dead and hard seeds, seedling length and germination speed index. In emergency test the treatments were the same used for sanity test evaluating emergency percentage, emergence first count, abnormal seedlings and emergence speed index. The treatments were carried out in a factorial 3 x 3 x 4 x 3 + 2. It was realized regression analysis for quantitative data (immersion time), with the significance of the models checked by F test . The fungi were identified in the seeds were: Aspergillus niger, Aspergillus sp .; Penicillium sp .; Rhizopus sp.; Fusarium sp .; Rhizoctonia sp .; Botrytis sp. and Clasdosporium sp.. Heat treatments at temperatures of 50, 60 and 70 °C were effective in reducing Penicillium sp .; Rhizopus sp .; Fusarium sp .; Rhizoctonia sp .; Botrytis sp. and Cladosporium sp. Thermotherapy did not reduce the physiological quality of A. colubrina seeds and resulted in an increase in the percentage of seeds germination and emergence.