Dark Respiration Rates in Vaccinium spp. in Relation to Altitude

Flora ◽  
1974 ◽  
Vol 163 (5) ◽  
pp. 415-421 ◽  
Author(s):  
W.S. Stewart ◽  
P. Bannister
Keyword(s):  
Dark Respiration ◽  
Respiration Rates

Photosynthesis and respiration decline with light intensity in dominant and suppressed Eucalyptus globulus canopies

2008 ◽  
Vol 35 (6) ◽  
pp. 439 ◽  
Author(s):  
A. P. O'Grady ◽  
D. Worledge ◽  
A. Wilkinson ◽  
M. Battaglia
Keyword(s):  
Eucalyptus Globulus ◽  
Dark Respiration ◽  
Light Availability ◽  
Structural Complexity ◽  
Leaf Nitrogen ◽  
Leaf Nitrogen Content ◽  
Area Index ◽  
Respiration Rates ◽  
Leaf Dark Respiration ◽  
Photosynthesis And Respiration

Within canopy gradients in light-saturated photosynthesis (Amax), foliar nitrogen ([N]area) and leaf dark respiration (R15) were studied in the canopies of dominant and suppressed trees within an even-aged (4-year-old) Eucalyptus globulus (Labill) stand in southern Tasmania. Despite being an even-aged stand growing in a relatively uniform environment with respect to nutrient and water availability, the stand exhibited considerable structural complexity. Diameter at 1.3 m ranged between 3 cm and 21 cm, trees average 12 m height and stand leaf area index was ~6 m2 m–2 leading to strong gradients in light availability. We were interested in understanding the processes governing canopy production in trees of contrasting dominance classes. Vertical gradients in photosynthesis and foliar respiration were studied within the canopies of dominant and suppressed trees during 2006 and 2007. Amax varied from ~18 μmol m–2 s–1 in the upper canopy to 3 μmol m–2 s–1 at lower canopy positions. On average, Amax were higher in the dominant trees than in the suppressed trees. However, at any given height, Amax were similar in suppressed and dominant trees and were strongly related to leaf nitrogen content. Dark respiration varied from ~1.4 μmol m–2 s–1 in the upper canopy to 0.2 μmol m–2 s–1 in the lower canopy positions. In contrast to the patterns for Amax, dark respiration rates in the suppressed trees were higher than dominant trees at similar canopy positions. Respiration rates were also strongly related to [N]area and to Amax.

Observations of the Photosynthetic Physiology of Tree Species within the C3 Monocotyledon Genus Pandanus, and Comparison with Dicotyledon C3 Tree Species

1998 ◽  
Vol 46 (1) ◽  
pp. 103 ◽  
Author(s):  
Catherine E. Lovelock
Keyword(s):  
Leaf Area ◽  
Specific Leaf Area ◽  
Tree Species ◽  
Dark Respiration ◽  
Dry Weight ◽  
Weight Basis ◽  
Growth And Survival ◽  
Respiration Rates ◽  
Leaf Dark Respiration ◽  
Resource Levels

Photosynthetic characteristics of tree species from the tropical C3 monocotyledon genus Pandanus were compared with C3 dicotyledon species growing in similar environments. The Pandanus species had similar maximum photosynthetic rates (Amax) to dicotyledon tree species in leaves from both sun and shaded environments when Amax was expressed on an area basis. Because of the low specific leaf area of the schlerophyllous leaves of the Pandanus compared to the dicotyledon species, the similarity in Amax was no longer evident when Amax was expressed on a dry-weight basis. Leaf dark respiration rates of the Pandanus on a leaf area and weight basis were generally lower than the shade-intolerant dicotyledons and similar to the shade-tolerant dicotyledon species. Low dark respiration rates and low specific leaf area of the Pandanus may be important characteristics for growth and survival in environments where resource levels are low and the likelihood of tissue damage is high.

scholarly journals GAS EXCHANGE CHARACTERISTICS OF FIELD-GROWN `SHAWNEE' BLACKBERRY

HortScience ◽  
1991 ◽  
Vol 26 (6) ◽  
pp. 687G-688
Author(s):  
Curt R. Rom ◽  
John R. Clark
Keyword(s):  
Gas Exchange ◽  
Dark Respiration ◽  
Temperature Response ◽  
Quadratic Function ◽  
Respiration Rates ◽  
Leaf Chamber ◽  
Portable System ◽  
Use Efficiency ◽  
Gas Exchange Characteristics ◽  
Chamber Gas

Gas exchange (assimilation, transpiration, water use efficiency, and conductance) of `Shawnee' blackberry were measured under field conditions with a portable system (ADC-IRGA with Parkinson Leaf Chamber). Gas exchange primocane pentifoliate leaflets were similar. Gas exchange rates of leaves along a cane exhibited a quadratic function of leaf position with leaves in lower-mid sections (relative position 0.3 - 0.5) having higher A, TR, WUE, gs than either basal or apical leaves. Leaves subtending fruiting laterals on fruiticanes had higher assimilation than similar age leaves on primocanes but did not differ in Tr, WUE, or gs. Primocanes had estimated dark respiration rates of 0.33mg·dm-1.hr-1, estimated light compensation at 14-20 mol.m-2.s-1, estimated light saturation at 1000-1100 mol.m-2.s-1 with maximum A rates ranging from 24-30 mg CO2.dm-1.hr-1. Measurements were made at field temperatures ranging from 24-35 C. Although temperature response was not measured, correlation indicated that Tr, WUE, and gs were more closely related to temperature than A. Similarly, Tr and WUE were more closely related to gs than A (r = 0.6 to 0.8).

Effects of phosphorus and sulphur on dark respiration of subterranean clover leaves

1971 ◽  
Vol 22 (5) ◽  
pp. 723 ◽  
Author(s):  
D Bouma
Keyword(s):  
Dark Respiration ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
The Other ◽  
Phosphorus Level ◽  
Respiration Rates ◽  
Phosphorus Status ◽  
Whole Plants ◽  
Complete Solutions ◽  
Phosphorus Levels

Respiration rates in the dark (oxygen uptake) of leaves sampled from subterranean clover plants (Trifolium subterraneum L. cv. Mt Barker) increased with the phosphorus supply in the culture solutions in which the plants were grown. Over a period of 3 hr no differences were detected in respiration rates when leaves of these plants were placed in Warburg flasks containing complete solutions or solutions without phosphorus. However, when whole plants were transferred to complete and no-phosphorus solutions, the differences in respiration rates of leaves sampled from the two groups of plants depended on the phosphorus status of the plants at transfer. Leaves from plants raised at an adequate phosphorus level showed no differences over a period of 96 hr after transfer, but leaves from plants raised at suboptimal phosphorus levels before transfer to complete and no-phosphorus solutions showed significant differences in respiration rates as early as 18-19 hr after transfer. Similar results were obtained for leaves sampled from plants raised at different sulphur levels when transferred to complete solutions and to solutions without sulphur. However, these differences took longer to develop than in the phosphorus experiments. When phosphorus-deficient plants were transferred to complete solutions and to other solutions each without a different element, the respiration rates of the leaves sampled from the plants in the solutions without phosphorus were much lower than for the leaves of plants in the other solutions.

A field study on the respiration rates in the leaves of temperate plants

1989 ◽  
Vol 67 (12) ◽  
pp. 3478-3481 ◽  
Author(s):  
Donald E. Collier ◽  
W. Raymond Cummins
Keyword(s):  
Field Study ◽  
Key Words ◽  
Dark Respiration ◽  
Alternative Pathway ◽  
Salicylhydroxamic Acid ◽  
Respiration Rates ◽  
Understory Herbs ◽  
Fluctuating Environments ◽  
Cyanide Resistance ◽  
Physiological Flexibility

The field respiration rates of leaves, in terms of total dark respiration, cytochrome (cyanide sensitive) pathway respiration, and alternative (salicylhydroxamic acid sensitive) pathway respiration, were measured in 10 temperate species. Five spring understory herbs and five ruderal species were used. All species displayed resistance to cyanide and sensitivity to salicylhydroxamic acid, indicating a capacity and some engagement of the alternative pathway. In comparison with reports on the field respiration rates of leaves in arctic and boreal species, the temperate plants had significantly less O2 uptake along both respiratory pathways. Rates of alternative pathway respiration in this study were comparable with those reported in the leaves of crop plants. In a comparison of respiration rates between the ruderal and understory species, the ruderal species had significantly greater activity along the alternative pathway. The ruderals also had a significantly greater capacity for the alternative pathway. It is proposed that the presence of the alternative pathway somehow allows physiological flexibility in the ruderals, and this in turn aids in their survival in fluctuating environments. Key words: alternative pathway, cyanide resistance, respiration, ruderal, understory.

Temperature relations of gas exchange in altitudinal populations of Taraxacum officinale

1977 ◽  
Vol 55 (19) ◽  
pp. 2496-2502 ◽  
Author(s):  
Paul R. Kemp ◽  
George J. Williams III ◽  
David S. May
Keyword(s):  
Gas Exchange ◽  
Dark Respiration ◽  
Net Photosynthesis ◽  
Taraxacum Officinale ◽  
Verbascum Thapsus ◽  
Respiration Rates ◽  
Hill Activity ◽  
Population Origin ◽  
Weedy Species ◽  
Temperature Responses

Taraxacum officinale plants representative of three altitudinally diverse populations were grown under uniform conditions. Temperature responses of net photosynthesis, photorespiration, and transpiration were obtained from four plants of each population over the range of 10 to 40 °C at saturating irradiances(1000 μE ∙ m−2 ∙ s−1). Dark respiration rates were obtained from the same plants over the range of 10 to 30 °C. All plants exhibited similar gas exchange responses to temperature regardless of population origin. Maximum rates of net photosynthesis occurred near 20 °C in all plants and averaged 20.8 mg CO2 ∙ dm−2 ∙ h−1 (mean of 12 plants). Dark respiration and photorespiration rates increased nearly linearly with temperature in all plants. These results are in contrast with previous studies of the same populations in which differences in Hill activity and succinate dehydrogenase activity were reported. However, the photosynthetic patterns and lack of genetic differentiation of photosynthesis are similar to the results obtained for another weedy species, Verbascum thapsus, along the same altitudinal transect.

Sign in / Sign up

Export Citation Format

Share Document