Data/hora: 07/06/2024 13:39:18

Biblioteca(s): | Embrapa Semiárido.
Tipo da produção científica: | Capítulo em Livro Técnico-Científico
Data corrente: | 17/11/2020
Data da última atualização: | 17/11/2020
Autoria: | SEAL, C. E.; DANTAS, B. F.
Afiliação: | CHARLOTTE E. SEAL; BARBARA FRANCA DANTAS, CPATSA.
Título: | Germination functional traits in seeds of halophytes.
Ano de publicação: | 2020
Fonte/Imprenta: | In: GRIGORE, M. N. (Ed.). Handbook of halophytes. Cham: Springer, 2020.
ISBN: | 978-3-030-17854-3
DOI: | https://doi.org/10.1007/978-3-030-17854-3_50-1
Idioma: | Inglês
Conteúdo: | Many families of halophytes rely on seeds for their natural regeneration. As a functional trait, germination is highly responsive to the environment including salinity. For some halophyte species, their seeds may avoid periods of high salinity through dormancy, which may be present in only one seed morph in species with heteromorphic seeds, and can be influenced by the maternal environment and transgenerational effects. Avoidance strategies are plastic and can vary among and within species as well as with habitat. Other species of halophytes are highly tolerant to salinity, with germination occurring in conditions more than twice the concentration of sodium chloride found in seawater, utilizing physiological mechanisms such as ion compartmentalization and osmotic adjustment. However, these strategies are not exclusive to halophytes and are sometimes found in germinating seeds of salt-tolerant non-halophytes. Quantification of the germination niche to the environment can be made using the population-based germination models thermal time (temperature), hydro time (water potential), and halo time (salinity). These models estimate environmental thresholds to germination and germination rate changes with the environment. Of the few examples of applying these models to salinity, the germination of halophytes appears no more tolerant to salinity than non-halophytes. More frequent application of these models is required to build a global view. As demonstrated by a case study in the Brazilian Caatinga (a semiarid ecosystem), validation of these germination models in situ, combined with climate and soil data, can be used to predict germination responses to climate change.
Palavras-Chave: | Planta halofita; Traços funcionais.
Thesagro: | Germinação; Salinidade; Semente.
Thesaurus Nal: | Halophytes.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Semiárido (CPATSA)
Exemplares: | CPATSA - (59257-1) - UPC - PL - DD -  -  -  - DIS