<b>Chronological analysis of the physiological quality of diaspores of <i>Myracrodruon urundeuva</i> Fr. All. in semiarid regions

Abstract

The objective of this study was to evaluate the physiological quality of diaspores from Myracrodruon urundeuva mother trees developing in the Cariri region of the state of Paraíba, Brazil. The seeds were collected during three consecutive years and from different areas of the Cariri region. The seed collection areas comprised two sites in the municipality of Boa Vista and one in the municipality of São João do Cariri. The diaspores had their water content determined and were submitted to the following tests: germination, seedling emergence, first count of germination and seedling emergence (within 5 days), and speed of germination and seedling emergence. The treatment means were compared using the deviance statistic. The collection years and collection areas were compared by the Tukey test at a 5% probability level. The comparison between mother trees was made through principal component analysis and cluster analysis. The detected variation in the quality of M. urundeuva diaspores is dependent on environmental conditions. The physiological quality of M. urundeuva diaspores varies according to mother tree, collection area and year. Mother trees of groups 1 and 2 are the most promising since they included representatives of all three areas and produced diaspores of high physiological quality.

O que Sabemos sobre as Sementes de Astronium urundeuva (M. Allemão) Engl. (Anacardiaceae)? Revisão sobre uma Espécie Ameaçada e com Importância Socioeconômica

“…A porcentagem de germinação de A. urundeuva pode variar de acordo com o lote de sementes, apresentando valores geralmente acima de 60%. Segundo Azevedo et al (2018), a qualidade fisiológica dos diásporos de A. urundeuva é dependente dos fatores ambientais, podendo variar entre árvores matrizes, anos e locais de coleta. Esses autores observaram diferenças para porcentagem de emergência e índice de velocidade de emergência, sendo que a porcentagem de emergência variou entre 16 e 65% e o índice de velocidade de emergência variou entre 0,64 e 3,49.…”