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Functional consequences of stenophylly for leaf productivity: comparison of the anatomy and physiology of a rheophyte, Farfugium japonicum var. luchuence, and a related non-rheophyte, F. japonicum (Asteraceae).

Authors :
Nomura N
Setoguchi H
Takaso T
Source :
Journal of plant research [J Plant Res] 2006 Nov; Vol. 119 (6), pp. 645-56. Date of Electronic Publication: 2006 Oct 07.
Publication Year :
2006

Abstract

We investigated the anatomical and physiological characteristics of stenophyllous leaves of a rheophyte, Farfugium japonicum var. luchuence, and sun and shade leaves of a non-rheophyte, F. japonicum, comparing three different populations from coastal, forest floor, and riparian habitats. Light adaptation resulted in smaller leaves, and riparian adaptation resulted in narrower leaves (stenophylly). The light-saturated rate of photosynthesis (P (max)) per unit leaf area corresponded to the light availability of the habitat. Irrespective of leaf size, the P (max) per unit leaf mass was similar for sun and shade leaves. However, the P (max) per mass of stenophyllous leaves was significantly lower than that of sun and shade leaves. This was because the number and size of mesophyll cells were greater than that required for intercellular CO(2) diffusion, which resulted in a larger leaf mass per unit leaf area. Higher cell density increases contact between mesophyll cells and enhances leaf toughness. Stenophyllous leaves of the rheophyte are frequently exposed to a strong water flow when the water level rises, suggesting a mechanical constraint caused by physical stress.

Details

Language :
English
ISSN :
0918-9440
Volume :
119
Issue :
6
Database :
MEDLINE
Journal :
Journal of plant research
Publication Type :
Academic Journal
Accession number :
17028796
Full Text :
https://doi.org/10.1007/s10265-006-0024-5