Effects of storage on germination ofDioscorea composita (Dioscoreaceae) seeds

Abstract

Effects ofstorage were tested on germination of Dioscorea composita (Dioscoreaceae) seeds. Freshly collected seeds and seeds stored at 25"C in paper bagsfrom 1 to 11 mo or for 4 and 5 yr were used in most of the experiments. Seeds were testedfor germination at 20,25,30, 35, 25-20, 25-30, and 25-35"C in white light and in darkness. Initiation ofgermination was delayed in freshly harvested seeds, and dormancy was reduced in seeds stored for about 9 mo. Viability of the seeds decreased after 4 and 5 yr ofstorage.Efeito do Armazenamento na Germinacao de Sementes de Dioscorea composita (Dioscoreaceae). Os efeitos do armazenamento foram verificados na germinaciio de sementes de Dioscorea composita. Sementes recem-coletadas e outras armazenadas, de 1 a 11 meses ou de 4 e 5 anos, em sacos de papel at 25°C eram usadas nos testes. A germinacdo era testada, em condiciies de luz branca e escuro nas temperaturas de 20,25, 30, 35, 25-20, 25-30, e 25-35"C. 0 inicio da germinacdo era mais tardio para sementes recem-coletadas. A dormencia era" reduzida com sementes armazenadas por 9 meses. A viabilidade das sementes diminuia ap6s armazenamento por 4 ou 5 anos.

Floral phenology, seed germination and hybrid plants of the Amerindian yam (Dioscorea trifida)

“…Dioscorea trifida seed dormancy was broken faster than in other species of Dioscorea, such as D. rotundata, which has a dormancy period of three to four months after harvest and a relatively low germination rate due to embryo or endosperm development issues (Sadik 1976). An even longer dormancy time was observed for D. composita Hemsl., which broke dormancy only after storage for nine months (Viana and Felippe 1990). These results suggest that D. trifida presents a physiological dormancy, as do other Dioscorea species, such as the medicinal D. villosa L. (Langhu and Deb 2014).…”

Germination Trials and Domestication Potential of Three Native Species With Edible Sprouts: Ruscus Aculeatus L., Tamus Communis L. And Smilax Aspera L.

“…Germination of T. communis was satisfactory, and prone to improvement with simple osmotic treatments. Long germination time was found in other Dioscoreaceae species (Sadik, 1977;Viana and Felippe, 1990), where it was shown that post-maturation after harvest can shorten dormancy. Therefore, this option could be assayed for T. communis too, to reduce the risks connected with a too long germination time.…”