Estratégias para tolerar o estresse salino em duas espécies lenhosas tropicais

Bruno Melo Lustosa, Lígia Gomes Ferreira Souza, Gabriella Frosi, Hiram Marinho Falcão, Silvia Pereira, Marciel Teixeira Oliveira, Mauro Guida Santos

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.

Palavras-chave


Análises bioquímicas; Trocas gasosas foliares; Potencial hídrico foliar

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DOI: http://dx.doi.org/10.4336/2017.pfb.37.89.1332

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