Strategies of two tropical woody species to tolerate salt stress

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

doi:10.4336/2017.pfb.37.89.1332

Authors

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

Keywords:

Biochemical analysis, Leaf gas exchange, Leaf water potential

Abstract

This study aimed to evaluate the leaf primary metabolism in two woody species, Sterculia foetida and Bombacopsis glabra. Both species have seeds rich in oil and they are largely found in regions with irregularities in water availability. Seedlings were grown in a greenhouse from seeds. At 140 days after emergence, 50% of the plants were subjected to salt stress for 23 days, daily receiving 100 mM of NaCl solution. In both species, leaf stomata conductance and water potential decreased quickly under salt stress. The two species showed different strategies in photosynthetic pigment concentration and components of nitrogen metabolism. S. foetida kept the pigment concentration unchanged after 23 days of stress, while B. glabra increased concentration of chlorophyll a and carotenoids. S. foetida showed a high leaf concentration of K⁺ in stressed plants and a Na⁺/K⁺ ratio without differences when compared to control. Thus, S. foetida presented a better ionic balance, while B. glabra invested in photoprotection. Therefore, both species present potential to be planted in Brazilian Northeast, where water deficit and salt stress are challenging for annual crops.

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