Physiological and metabolic responses of immature and mature seeds of Libidibia ferrea ((Mart. ex Tul.) L.P. Queiroz) under contrasting storage temperatures
| Autor: | João Paulo Naldi Silva, Roseli Betoni Bragante, Rita de Cássia L. Figueiredo-Ribeiro, Danilo da Cruz Centeno, Aline F Hell, Claudio José Barbedo |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine biology food and beverages Plant Science Metabolism biology.organism_classification 01 natural sciences Citric acid cycle 03 medical and health sciences Horticulture 030104 developmental biology Germination Darkness Respiration Dormancy Libidibia ferrea Desiccation 010606 plant biology & botany |
| Zdroj: | Brazilian Journal of Botany. 41:43-55 |
| ISSN: | 1806-9959 0100-8404 |
| DOI: | 10.1007/s40415-018-0442-3 |
| Popis: | Libidibia ferrea ((Mart. ex Tul.) L.P. Queiroz) is a leguminous tree species with seeds tolerant to desiccation and physical dormancy when mature. In this work, immature and mature seeds collected from trees were dried and stored at − 18 and 25 °C under continuous light or darkness for 1, 2, 6 and 12 months and evaluated with respect to moisture content, germination, respiration and metabolic profile. At the beginning of the storage period, seeds of both stages showed high O2 consumption and low CO2 release, due possibly to oxidative processes, which were reduced after both drying and storage. This could explain the higher viability of mature seeds stored at 25 and − 18 °C, while the immature ones deteriorate, mainly at 25 °C. The presence or absence of light did not affect substantially the seed physiology during storage. Metabolic profile revealed a decrease in the proportion of some intermediates of the tricarboxylic acid cycle, such as citric and malic acids, in mature seeds, indicating a metabolic switch. After artificial drying, immature seeds showed equal proportions of malate, citrate and high levels of reducing sugars and amino acids, which could indicate an active metabolism. These compounds were not observed in mature seeds. Our results indicate that the primary metabolism of L. ferrea seeds is decreased at seed maturity, similar to what occurs in classic orthodox seeds, while the immature ones are comparable to seeds with recalcitrant behavior. For better preservation, mature seeds of L. ferrea should be stored for about 12 months at − 18 °C. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink