Ultrastructural alterations into chloroplasts and root nodules of cowpea plants grown under saline stress conditions

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Published: Oct 14, 2013
Keywords:
saline stress, ultrastructure, starch, cowpea

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Ernesto Gómez Padilla
Universidad de Granma

Abstract

The ultrastructure of leaves chloroplast and root nodules from cowpea plants (Vigna unguiculata (L.) Walp.), var. IT 86 D-715, subjected to saline stress was evaluated by Transmission Electron Microscopy (TEM). Plants were exposed at 150 and 0,02 mM of NaCl treatments, considering 0,02 mM salt level as control. Native strain VIBA-1 (Bradyrhizobium liaoningense) isolated from saline soils of Cauto Valley (Cuba) was inoculated at sowing. Forty days after germination, samples of the same age and position from leaves and root nodules were taken for microscopy observations. Some ultrastructural modifications were detected by the salt effect in chloroplasts, mainly triggered by the great increase in the size of the starch granules. These modifications produced altered grana distribution. In nodule structure, when saline stress was applied, a weakness of peribacteroid membrane and high number of vesicles into infected cells were noted. Symbiosomes started deteriorating with some broken peribacteroidal membranes. A high vesiculation and degradation of some cellular organelle into uninfected cells were observed.

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How to Cite
Gómez Padilla, E. (2013). Ultrastructural alterations into chloroplasts and root nodules of cowpea plants grown under saline stress conditions. Cultivos Tropicales, 35(1), 62–66. Retrieved from https://ediciones.inca.edu.cu/index.php/ediciones/article/view/810
Issue
Vol. 35 No. 1 (2014)
Section
Original Article

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