Balasubramaniyam, Anuluxshy, Chapman, Mark M. and Harvey, Patricia J. ORCID: https://orcid.org/0000-0001-7193-4570 (2015) Responses of tall fescue (Festuca arundinacea) to growth in naphthalene-contaminated sand: xenobiotic stress versus water stress. Environmental Science and Pollution Research, 22 (10). pp. 7495-7507. ISSN 0944-1344 (Print), 1614-7499 (Online) (doi:10.1007/s11356-015-4084-8)

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Abstract

The adaptations of tall fescue (Festuca arundinacea) arising from growth in naphthalene-contaminated sand (0.8 g kg−1 sand dry weight (dw)) were investigated in the contexts of xenobiotic stress and water stress. The transfer of polycyclic aromatic hydrocarbons (PAHs) across the root endodermis was investigated using the hydrophobic Nile red stain as a PAH homologue. Nile red was applied to the epidermis of a living root to visualise uptake into the root through the transpiration stream, and the distance travelled by the stain into the root tissues was investigated using epi-fluorescence microscopy (Nikon Eclipse 90i). The results showed that the Nile red applied to the roots grown in naphthalene-contaminated sand was unable to penetrate the roots beyond the endodermis, whereas those grown in ‘clean’ sand showed evidence of uptake into the xylem vessels beyond the endodermis. Furthermore, partial collapse was observed in the cortex of naphthalene-treated roots, suggesting drought stress. Interestingly, the treated plants showed visual resilience to drought stress whilst the leaves of the control plants showed signs of wilting.

Item Type:	Article
Uncontrolled Keywords:	epi-fluorescent microscopy, Naphthalene contamination, Nile red uptake, PAH homologue, root structural adaptations, scanning electron microscopy, tall fescue, water stress, xenobiotic stress
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Education, Health & Human Sciences > School of Human Sciences (HUM)
Related URLs:	Publisher
Last Modified:	09 Oct 2021 04:46
URI:	http://gala.gre.ac.uk/id/eprint/13142

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