Journal ArticleDOI
Effects of light and temperature on leaf anatomy and photosynthesis in Fragaria vesca.
TLDR
It was concluded that adaptation to a range of environmental conditions cannot be consistently attributed to changes in mesophyll cell volume or surface area.Abstract:
Fragaria vesca, the woodland strawberry, was grown under a series of controlled environments including variations in light intensity, average temperatures, and temperature amplitude around a constant mean. Observations on CO2 exchange capacities, leaf anatomy, and cell ultrastructure were made for each treatment to determine relationships between these variables. With increasing light intensity, leaf thickness, leaf density, and mesophyll cell surface area and volume per leaf surface area increased. Net photosynthesis (NPS) per leaf weight decreased with increasing light pretreatment while NPS per area increased from low to medium intensity, then decreased at the highest intensity. Depression of photosynthesis at the highest light pretreatment may have been due to massive starch accumulation in the chloroplasts associated with the sodium vapor lamps used. Correlation of all anatomical variables was highly significant with dark respiration and NPS per dry weight but insignificant for NPS per leaf area. In the variable temperature treatments, photosynthetic acclimation occurred with a shift in optimum temperature for NPS in the direction of prevailing growth temperature. Absolute rates were highest at moderate pretreatment temperatures and were reduced by extreme growth temperatures. Thick leaves with low density mesophyll became thinner and more dense with increasing growth temperature corresponding to an increase in maximum net photosynthetic rates. Leaves became thicker and more dense at the highest temperatures, but with an increase in cell damage and indications of changes in metabolic pathways. Highest correlations for gas exchange rates were with specific leaf weight (weight per area). Correlation with other anatomical variables were scattered or insignificant. It was concluded that adaptation to a range of environmental conditions cannot be consistently attributed to changes in mesophyll cell volume or surface area.read more
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Book ChapterDOI
Responses to Different Quantum Flux Densities
TL;DR: In any habitat the quantum flux density varies seasonally, diurnally, and spatially (such as within a canopy of a given plant stand) as mentioned in this paper, which is the most conspicuous environmental variable with which plants must cope.
Journal ArticleDOI
Leaf specific mass confounds leaf density and thickness
TL;DR: While LSM is a useful measure of sclerophylly, its separation into leaf density and thickness may be more appropriate as they often vary independently and appear to be more responsive to environmental gradients than LSM.
Journal ArticleDOI
The ‘hydrology’ of leaves: co‐ordination of structure and function in temperate woody species
TL;DR: For the six species, Klamina was independent of inter-related leaf traits including leaf dry mass per area, density, modulus of elasticity, osmotic potential, and cuticular conductance, but independent of other traits relating to drought tolerance and to aspects of carbon economy.
Journal ArticleDOI
Leaf anatomy, specific mass and water content in congeneric annual and perennial grass species
Eric Garnier,G. Laurent +1 more
TL;DR: Leaf transverse sections of seven annual-perennial pairs of grass species grown in the laboratory were analyzed to elucidate the anatomical bases of differences in leaf specific mass and leaf water content, and the anatomical character that best explained interspecific differences was the volume of cell walls per unit leaf area.
Journal ArticleDOI
Estimating near-infrared leaf reflectance from leaf structural characteristics
TL;DR: The relationship between near-infrared reflectance at 800 nm from leaves and characteristics of leaf structure known to affect photosynthesis was investigated in 48 species of alpine angiosperms and showed that measured NIRR was highly correlated with A(mes)/A, leaf bicoloration, and the presence of a thick leaf cuticle.
References
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Book ChapterDOI
Stereological principles for morphometry in electron microscopic cytology.
TL;DR: This chapter focuses on the stereological principles for morphometry in electron microscopic cytology and the possibilities of applying morphometric methods to correlative cell biology.
Journal ArticleDOI
The control of leaf photosynthesis rate by the level of assimilate concentration in the leaf: A review of the hypothesis
T. F. Neales,L. D. Incoll +1 more
TL;DR: In this article, the authors propose a method to solve the problem of "missing links" in the context of artificial intelligence.VI. VII. VIII. IX. X. X
Journal ArticleDOI
Relation between Mesophyll Surface Area, Photosynthetic Rate, and Illumination Level during Development for Leaves of Plectranthus parviflorus Henckel
TL;DR: For P. parviflorus, the increased photosynthetic rate for leaves developing under higher illuminations resulted from a higher A(mes)/A, not from changes in the CO(2) resistances within individual mesophyll cells, expressed per unit area of cell surface.
Relation between Mesophyll Surface Area, Photosynthetic Rate, and Illumination Level during Development for Leaves of
TL;DR: In this paper, the influence of illumination level during leaf development on the mesophyll cell surface area per unit leaf area (Armes /A), CO2 resistances, and the photosynthetic rate was determined for leaves of Plectranthus parviflorus Henckel.