Temporary Storage of Jussara Palm Seeds: Effects of Time, Temperature and Pulp on Germination and Vigor

background

The seeds of the jussara palm (Euterpe edulis) are recalcitrant and immediate sowing is not always possible after harvest; hence, research that examines the ability of the seeds to be stored and the effect of this storage on germination proves important.

Research Goals & Methods

In order to assess the effect of storage time, temperature and storage with or without pulp, the authors stored seeds with and without pulp at 5,10,15, and 20-30 degrees Celsius for 0,3, 6,9, and 12 days after harvest and, after storage, measured water content, germination rate, and seedling length and dry matter (vigor).

Conclusions & Takeaways

Seeds without pulp stored from 9-12 days showed highest germination rates and greatest vigor. Seeds without pulp may be stored at any temperature ranging from 3 to 20-30 degrees C, but seeds with pulp stored at temperatures above 20 degrees C showed a decrease in germination and vigor as well as higher mortality and an increase in rotted germinative button. The authors observed superior physiological quality (as observed through germination rates), in seeds stored at 10 and 15 degrees C. Seed water content was not significantly affected by treatments (time, temperature, pulp). Based on their results and those of other studies, the authors suggest that jussara seeds must be depulped and kept in plastic bags in order to be stored. If immediate depulping is not possible, seeds may be stored between 5 and 15 degrees C. Additionally, due to the after-ripening behavior of jussara, a period of seed storage is required before sowing. The authors recommend that future studies test storage periods of longer than 12 days, as germination and vigor were shown to increase with storage time.