Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves.

Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves. Abstract Text:

Climatic constraints on diurnal variations in photosynthetic traits were investigated in oaks (Quercus pubescens Willd.) growing in the Swiss Alps. The measurement period included the summer of 2003, when central Europe experienced a record-breaking heat wave. During the summer, a combination of moderate heat and drought caused a reduction in photosynthetic CO(2) assimilation rate (P(n)) by mid-morning, which increased by the afternoon. More extreme drought and heat caused a sharp day-long reduction in P(n). These effects were closely related to changes in stomatal conductance (g(s)), but low g(s) was unaccompanied by low intercellular CO(2) concentrations (C(i)). Around midday, a combination of heat and drought increased C(i), indicating metabolic limitation of photosynthesis. Chlorophyll a (Chl a) fluorescence measurements revealed reversible down-regulation of photosystem (PS) II activity during the day, which was accentuated by heat and drought and correlated with diurnal variation in zeaxanthin accumulation. A combination of heat and drought reduced leaf Chl a + b concentrations and increased ratios of total carotenoids, xanthophyll-cycle carotenoids and lutein to Chl a + b. The combination of summertime heat and drought altered the 77 K Chl fluorescence emission spectra of leaves, indicating changes in the organization of thylakoid membranes, but it had no effect on the amounts of the major light-harvesting Chl-a/b-binding protein of PSII (LHCII), Rubisco, Rubisco activase, Rubisco-binding protein (cpn-60), phosphoribulokinase and chloroplast ATP synthase. The results demonstrate that Q. pubescens can maintain photosynthetic capacity under adverse summer conditions.

Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves. Publishing Authors By Initials

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Tree physiology

VOLUME: 28

Page Numbers: 785-95

Journal Abbreviation: Tree Physiol.

ISSN: 0829-318X

DAY: 4

MONTH: May

YEAR: 2008

Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 100955338

Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves.

AFFILIATION: Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland.

Country: Canada

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Tree Physiol

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Impact of an exceptionally hot dry summer on photosynthetic traits in oak Quercus pubescens leaves Related Publications

• A report of oral extramedullary acute myeloid leukaemia (AML) in an 8-year-old girl with newly diagnosed AML-M4Eo.
• Burn nursing is nursing.
• Cattle with thymic lymphoma and haematoma of the ventral neck: a comparison of findings.
• Cell growth, global phosphotyrosine elevation, and c-Met phosphorylation through Src family kinases in colorectal cancer cells.
• Changes of photosynthetic traits in beech saplings (Fagus sylvatica) under severe drought stress and during recovery.
• GABA(A) receptor-mediated signaling alters the structure of spontaneous activity in the developing retina.
• Imaging second messenger dynamics in developing neural circuits.
• Impact of an exceptionally hot dry summer on photosynthetic traits in oak (Quercus pubescens) leaves.
• Incarcerated inguinal hernia as the presenting feature of carcinoma of unknown primary site.
• Mangrove recruitment after forest disturbance is facilitated by herbaceous species in the Caribbean.
• Molecular dynamics simulations as a complement to nuclear magnetic resonance and X-ray diffraction measurements.
• Orbital abscess as a complication of odontogenic infection. A case report and review of the literature.
• Pharmacological effects of ephedrine alkaloids on human alpha(1)- and alpha(2)-adrenergic receptor subtypes.
• Preservation of follicle mantle in follicular lymphoma.
• Protein-calorie undernutrition in the nursing home.
• Provider-sponsored ADSs: reducing antitrust liability after Maricopa.
• Reducing the public health burden of low vision in the Rhode Island elderly.
• Role of cholesterol and polyunsaturated chains in lipid-protein interactions: molecular dynamics simulation of rhodopsin in a realistic membrane environment.
• Rumination syndrome: an emerging case scenario.
• Serum fatty acid profile of elderly tube-fed men in a nursing home.
• Support Vector Machines for detecting recovery from knee replacement surgery using quantitative gait measures.
• Tethered yohimbine analogs as selective human alpha2C-adrenergic receptor ligands.
• The noncatalytic triad of alpha-amylases: a novel structural motif involved in conformational stability.
• Twinrix vaccination schedules among injecting drug users.
• Ultrasonographic findings in cows with right displacement of the abomasum and abomasal volvulus.
• [(Not) a brief awakening]
• [Chronic trichomonas infections in the male. Their significance for fertility disorders]
• [Effect of some phenothiazine derivatives, especially megaphen, on gas exchange in white rats.]
• [Reconstruction of the female breast with free transverse lower abdominal flap as perforator flap]
• [The face-neck lift]