Estratégias para tolerar o estresse salino em duas espécies lenhosas tropicais

Autores

  • Bruno Melo Lustosa Universidade Federal de Pernambuco
  • Lígia Gomes Ferreira Souza Universidade Federal de Pernambuco
  • Gabriella Frosi Universidade Federal de Pernambuco
  • Hiram Marinho Falcão Universidade Federal de Pernambuco
  • Silvia Pereira Universidade Federal de Pernambuco
  • Marciel Teixeira Oliveira Universidade Federal de Pernambuco
  • Mauro Guida Santos Universidade Federal de Pernambuco

DOI:

https://doi.org/10.4336/2017.pfb.37.89.1332

Palavras-chave:

Análises bioquímicas, Trocas gasosas foliares, Potencial hídrico foliar

Resumo

O estudo teve como principal objetivo avaliar o metabolismo primário foliar de duas espécies lenhosas, Sterculia foetida e Bombacopsis glabra, de sementes ricas em óleo e amplamente encontradas em regiões com disponibilidade hídrica irregular. As duas espécies foram cultivadas em casa de vegetação a partir de sementes. Aos 140 dias após a emergência, 50% das plantas foram submetidas ao estresse salino durante 23 dias, recebendo diariamente uma solução de 100 mM de NaCl. As duas espécies rapidamente reduziram a sua condutância estomática e o potencial hídrico foliar, em relação às plantas controle. S. foetida e B. glabra apresentaram estratégias diferentes quanto ao conteúdo de pigmentos fotossintéticos e componentes do metabolismo do nitrogênio. S. foetida manteve seus pigmentos intactos após 23 dias de estresse, enquanto B. glabra aumentou o conteúdo de clorofila a e carotenoides. S. foetida apresentou alto teor foliar de K+ e uma relação Na+/K+ sem diferença nas plantas estressadas comparadas com as do controle. Portanto, S. foetida apresentou um melhor em balanço iônico, enquanto B. glabra investiu em fotoproteção. Assim, as duas espécies são alternativa potencial para serem cultivadas no Nordeste brasileiro, onde condições de estresse hídrico e salinidade são restritivas para culturas anuais.

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Publicado

31-03-2017

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LUSTOSA, Bruno Melo; SOUZA, Lígia Gomes Ferreira; FROSI, Gabriella; FALCÃO, Hiram Marinho; PEREIRA, Silvia; OLIVEIRA, Marciel Teixeira; SANTOS, Mauro Guida. Estratégias para tolerar o estresse salino em duas espécies lenhosas tropicais. Pesquisa Florestal Brasileira, [S. l.], v. 37, n. 89, p. 63–72, 2017. DOI: 10.4336/2017.pfb.37.89.1332. Disponível em: https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1332. Acesso em: 29 mar. 2024.

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