Desiccation tolerance in seeds of nanche (Byrsonima crassifolia L.) Kunth

Abstract

Desiccation tolerance and seed longevity of yellow nanche Tejupilco, State of Mexico (warm climate) and Tuxtepec, Oaxaca (warm wet) was determined to classify as orthodox, recalcitrant or intermediate and choosing the right strategy for You keep them. In the first stage, the effect of drying on seed survival was evaluated. For this, the seeds were dried at 10, 5%, and the moisture witness (10.1 to 18.9 for Tejupilco and Tuxtepec); were stored by zero, three and six months at -20 °C and 20% RH, in a cold room. The variables evaluated were: tetrazolium viability, germination and emergence rate. The results indicated that although the increased viability when stored for six months, the force decreased; while germination and emergence rate were better when the seeds were not stored (64.44% and 0.3 seedlings emerged per day, respectively), which allows inferring intolerant to cold storage. Zero, three and six months in two environments: In the second stage the longevity of stored seeds was determined by cold roomat5±2°Cand20%RHandinaroomat19°C and 58% HR, with the same moisture content of the first stage. Above these variables were evaluated; the best performance was obtained when the seeds were not stored. It was concluded that seeds of both climates nanche are recalcitrant.