Lancaster EPrints

Grasses of different C4 subtypes reveal leaf traits related to drought tolerance in their natural habitats:changes in structure, water potential, and amino acid content

Carmo-Silva, Ana E. and Francisco, Ana and Powers, Stephen J. and Keys, Alfred J. and Ascensão, Lia and Parry, Martin A. J. and Arrabaça, Maria Celeste (2009) Grasses of different C4 subtypes reveal leaf traits related to drought tolerance in their natural habitats:changes in structure, water potential, and amino acid content. American Journal of Botany, 96 (7). pp. 1222-1235. ISSN 0002-9122

Full text not available from this repository.

Abstract

Three grasses (Poaceae) of different C4 subtypes, Paspalum dilatatum (NADP-malic enzyme [ME]), Cynodon dactylon (NAD-ME) and Zoysia japonica (phosphoenolpyruvate carboxykinase), occur in natural habitats that differ in annual rainfall. Their leaf characteristics were studied to identify traits related to drought tolerance. Plants were grown in pots, and water deficit was gradually induced by withholding water. Leaves of Z. japonica had the greatest and P. dilatatum the lowest relative dry matter content. Transverse sections of leaves that developed during the water deficit showed little change compared to control leaves, consistent with low phenotypic plasticity. Anatomical features distinguished the three species, with xeromorphic characteristics most strongly represented in Z. japonica. The leaf relative water content (RWC) decreased with the soil water content similarly for the three grasses. However, at 80% RWC, the leaf water potential was - 3.1 MPa for Z. japonica and only - 1.3 MPa for P. dilatatum and C. dactylon. Soluble amino acids, especially proline, increased as RWC decreased in leaves of C. dactylon and Z. japonica. Phenylalanine, valine, leucine, and isoleucine increased more in Z. japonica than in the other two species. The results provide evidence that C. dactylon and, especially, Z. japonica have evolved leaf traits better suited to arid habitats.

Item Type: Article
Journal or Publication Title: American Journal of Botany
Uncontrolled Keywords: C grasses ; Cynodon dactylon ; Drought stress ; Leaf anatomy ; Paspalum dilatatum ; Poaceae ; Water deficit ; Zoysia japonica
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 75870
Deposited By: ep_importer_pure
Deposited On: 21 Oct 2015 06:01
Refereed?: Yes
Published?: Published
Last Modified: 24 Nov 2017 06:21
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/75870

Actions (login required)

View Item