Leaf acclimation to soil flooding and light availability underlies photosynthetic capacity of Lindera melissifolia , an endangered shrub of bottomland forests in the Mississippi Alluvial Valley, USA.

Autor: Gardiner ES; Center for Bottomland Hardwoods Research, Southern Research Station, USDA Forest Service, 432 Stoneville Road, Stoneville, MS 38776, USA., Leininger TD; Center for Bottomland Hardwoods Research, Southern Research Station, USDA Forest Service, 432 Stoneville Road, Stoneville, MS 38776, USA., Connor KF; Formerly with the Center for Bottomland Hardwoods Research, Southern Research Station, USDA Forest Service, 432 Stoneville Road, Stoneville, MS 38776, USA., Devall MS; Formerly with the Center for Bottomland Hardwoods Research, Southern Research Station, USDA Forest Service, 432 Stoneville Road, Stoneville, MS 38776, USA., Hamel PB; Formerly with the Center for Bottomland Hardwoods Research, Southern Research Station, USDA Forest Service, 432 Stoneville Road, Stoneville, MS 38776, USA., Schiff NM; Formerly with the Center for Bottomland Hardwoods Research, Southern Research Station, USDA Forest Service, 432 Stoneville Road, Stoneville, MS 38776, USA., Wilson AD; Formerly with the Center for Bottomland Hardwoods Research, Southern Research Station, USDA Forest Service, 432 Stoneville Road, Stoneville, MS 38776, USA.
Jazyk: angličtina
Zdroj: Conservation physiology [Conserv Physiol] 2023 Jul 19; Vol. 11 (1), pp. coad051. Date of Electronic Publication: 2023 Jul 19 (Print Publication: 2023).
DOI: 10.1093/conphys/coad051
Abstrakt: Lindera melissifolia is an endangered shrub indigenous to the broadleaf forest of the Mississippi Alluvial Valley (MAV). In this region, extant colonies of the species are found in periodically ponded habitats where a diversity of broadleaf trees can form well-developed overstory and sub-canopies-these habitat characteristics suggest that soil flooding and light availability are primary drivers of L. melissifolia ecophysiology. To understand how these two factors affect its photosynthetic capacity, we quantified leaf characteristics and photosynthetic response of plants grown in a large-scaled, field setting of three distinct soil flooding levels (no flood, 0 day; short-term flood, 45 days; and extended flood, 90 days) each containing three distinct light availability levels (high light, 30% shade cloth; intermediate light, 63% shade cloth; and low light, 95% shade cloth). Lindera melissifolia leaves showed marked plasticity to interacting effects of flooding and light with lamina mass per unit area (L m/a ) varying 78% and total nitrogen content per unit area (N a ) varying 63% from the maximum. Photosynthetic capacity (A 1800-a ) ranged 123% increasing linearly with N a from low to high light. Extended flooding decreased the slope of this relationship 99% through a reduction in N availability and metabolic depression of A 1800-a relative to N a . However, neither soil flooding nor light imposed an additive limitation on photosynthetic capacity when the other factor was at its most stressful level, and the A 1800-a -N a relationship for plants that experienced short-term flooding suggested post-flood acclimation in photosynthetic capacity was approaching the maximal level under respective light environments. Our findings provide evidence for wide plasticity and acclimation potential of L . melissifolia photosynthetic capacity, which supports active habitat management, such as manipulation of stand structure for improved understory light environments, to benefit long-term conservation of the species in the MAV.
Competing Interests: None declared.
(© The Author(s) 2023. Published by Oxford University Press and the Society for Experimental Biology.)
Databáze: MEDLINE
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