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<p>As native vegetation continues to be cleared from tropical rainforests, some species with nutritional value and medicinal potential may be completely extinct. <i>Myrciaria glomerata</i> O. Berg. is a tree species from the Brazilian Atlantic Forest that produces fruits with high vitamin levels and is currently threatened at an unsustainable rate. Considering that seed response to drying often influences the propagation of a given species, this research had the objective of evaluating the dynamics over drying <i>Myrciaria glomerata</i> seeds in order to provide information about <i>ex-situ</i> conservation. Under a completely randomized design, with three replicates. The experiment consisted of a 2 × 6 factorial (drying methods and moisture contents). Treatments consisted of reducing water content of seeds down to levels of approximately 30, 25, 20, 15, 10 and 5%, either using silica gel (fast drying; 8% relative humidity, 25 °C) and under natural ambient conditions (slow drying; 25 ± 2 °C and 55% relative humidity). The effects of seed drying were assessed by evaluating germination total percentage and speed index, as well as shoot and primary root length, fresh and dry mass. Data was submitted to variance and regression analyses at 5% probability level. <i>M. glomerata</i> seeds showed 44% WC and 100% germination right after harvest; however, drying negatively affected physiological potential of seeds, using any of the methods (fast—with silica, or slow—under natural conditions). Reducing water content to WC lower than 20% decreased the physiological potential of seeds, as observed in their low capacity to produce well developed seedlings, at a high germination speed rate, as well as impaired dry mass translocation from the embryo for seedling growth. Our results demonstrate that <i>Myrciaria glomerata</i> seeds are sensitive to desiccation and that both fast and slow drying methods significantly reduce seed germination capacity and seedling vigor particularly below 13% water contents.</p>

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Drying of Myrciaria glomerata O. Berg. seeds: an approach for ex-situ conservation of a tropical forest species

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Fernanda Pinto,
  • Silvia Correa Santos,
  • Mariana Zampar Toledo,
  • Tathiana Elisa Masetto,
  • Renan Marré Biazatti,
  • Daiane Mugnol Dresch,
  • Cleberton Correia Santos

摘要

As native vegetation continues to be cleared from tropical rainforests, some species with nutritional value and medicinal potential may be completely extinct. Myrciaria glomerata O. Berg. is a tree species from the Brazilian Atlantic Forest that produces fruits with high vitamin levels and is currently threatened at an unsustainable rate. Considering that seed response to drying often influences the propagation of a given species, this research had the objective of evaluating the dynamics over drying Myrciaria glomerata seeds in order to provide information about ex-situ conservation. Under a completely randomized design, with three replicates. The experiment consisted of a 2 × 6 factorial (drying methods and moisture contents). Treatments consisted of reducing water content of seeds down to levels of approximately 30, 25, 20, 15, 10 and 5%, either using silica gel (fast drying; 8% relative humidity, 25 °C) and under natural ambient conditions (slow drying; 25 ± 2 °C and 55% relative humidity). The effects of seed drying were assessed by evaluating germination total percentage and speed index, as well as shoot and primary root length, fresh and dry mass. Data was submitted to variance and regression analyses at 5% probability level. M. glomerata seeds showed 44% WC and 100% germination right after harvest; however, drying negatively affected physiological potential of seeds, using any of the methods (fast—with silica, or slow—under natural conditions). Reducing water content to WC lower than 20% decreased the physiological potential of seeds, as observed in their low capacity to produce well developed seedlings, at a high germination speed rate, as well as impaired dry mass translocation from the embryo for seedling growth. Our results demonstrate that Myrciaria glomerata seeds are sensitive to desiccation and that both fast and slow drying methods significantly reduce seed germination capacity and seedling vigor particularly below 13% water contents.