Germination of Physalis peruviana L. seeds under varying conditions of temperature, light, and substrate

Fábio Oliveira Diniz, Larissa Chamma, Ana Dionisia da Luz Coelho Novembre

Resumo


Optimum seed germination conditions are crucial for the complete utilization of the potential of a crop. Hence, the objective of this study was to evaluate the effects of light, temperature, and substrate on the germination of Physalis peruviana L. seeds. Three seed lots were used, which were first assessed over a temperature gradient of nine intervals (from 15 °C to 35 °C) and alternating temperatures of 20-30 °C and 15-35 °C under a photoperiod of 8-h light. Subsequently, germination was studied according to the substrate used, i.e., blotting paper (on paper), sand (between sand), and vermiculite (between vermiculite), under 8-h light per day at a constant temperature of 25 °C or alternating temperatures (20-30 °C). Evaluations were conducted daily until germination stabilized, and normal seedlings were counted. The results are expressed in percentage, germination speed index, and mean germination time. The germination of P. peruviana seeds occurred within a wide temperature range (15 °C to 30 °C). A constant temperature of 25 °C and alternating temperatures of 20-30 °C were found to be optimum under 8-h light per day. Sand was the most suitable substrate, but paper and vermiculite can also be used as alternatives. Germination tests can be conducted on the 7th day (first count) and 14th day (last count) after test initiation.

Palavras-chave


Cape gooseberry; Seedlings; Thermo-gradient table; Seed analyze

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Referências


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