Molecular aspects during seed germination of Erythrina velutina Willd. under different temperatures (Part 1): reserve mobilization

Abstract

Erythrina velutina Willd. (Fabaceae) is a tree species that bears social, ecological, and economic importance for northeastern Brazil, a region with frequent temperature variations. The objective of this work was to evaluate the mobilization of reserves during seed germination and seedling establishment of E. velutina at different temperatures, and how these mechanisms are affected in a thermal-stress situation. The seeds germinated at 5, 15, 25, 35, and 45 °C, and the physiological and biochemical aspects of reserve mobilization (starch, lipids, and total proteins) were assessed during seedling establishment. Germination, vigor, and the mobilization of reserves from the cotyledons to the embryonic axis are affected according to the incubation temperature. The temperature of 25 °C favors the mobilization of reserves during seed germination and seedling establishment in E. velutina. In a situation of thermal stress, high temperatures affect the establishment of the seedlings, whereas low temperatures compromise the mobilization of reserves.

The cultivation environment influences the physiological quality of stored Sonchus oleraceus L. seeds

“…Regarding the temperatures within the storage times, it was observed that the temperature of 30 ºC provided an improvement in the percentage of germination, especially when the seeds were stored for 180 days. Higher temperatures increase the speed of chemical reactions accelerating the germination process (Felix et al, 2020).…”

Erythrina velutina Willd. alkaloids: Piecing biosynthesis together from transcriptome analysis and metabolite profiling of seeds and leaves

“…An additional reason for the relatively higher abundance of glycosylated alkaloids in seeds of E. velutina is the fact that lipids represent the second most abundant reserve in this species. Lipid reserve mobilization may generate hydrogen peroxide during germination and early seedling establishment, particularly at higher temperatures [30] , [31] .

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Influencia hídrica na germinação de sementes da espécie florestal Mimosa Caesalpiniifolia Benth

“…Salienta-se que a germinação das sementes pode ser influenciada por uma série de fatores, tais como a umidade, temperatura, substrato, oxigênio e luz (Carvalho et al, 2020;Felix et al, 2020). Uso de quantidade excessiva de água, ou seja, de umidade no substrato durante a germinação pode influenciar negativamente, com diminuição significativa na germinação, segundo Piña-Rodriguez; Figliolia; , durante essa fase a umidade deve ser mantida constante para não influenciar no potencial germinativo da semente.…”