scholarly journals Effects of prolonged drought on the anatomy of sun and shade needles in young Norway spruce trees

2015 ◽  
Vol 5 (21) ◽  
pp. 4989-4998 ◽  
Author(s):  
Roman Gebauer ◽  
Daniel Volařík ◽  
Josef Urban ◽  
Isabella Børja ◽  
Nina Elisabeth Nagy ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Prolonged Drought ◽  
Sun And Shade Needles ◽  
Sun And Shade

scholarly journals Effects of mild drought on the morphology of sun and shade needles in 20-year-old Norway spruce trees

2019 ◽  
Vol 12 (1) ◽  
pp. 27-34 ◽  
Author(s):  
R Gebauer ◽  
D Volarík ◽  
J Urban ◽  
I Børja ◽  
NE Nagy ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Sun And Shade Needles ◽  
Sun And Shade ◽  
Mild Drought

The impact of long-term CO2 enrichment on sun and shade needles of Norway spruce (Picea abies): Photosynthetic performance, needle anatomy and phenolics accumulation

Plant Science ◽  
2012 ◽  
Vol 188-189 ◽  
pp. 60-70 ◽  
Author(s):  
Zuzana Lhotáková ◽  
Otmar Urban ◽  
Marianna Dubánková ◽  
Milena Cvikrová ◽  
Ivana Tomášková ◽  
...  
Keyword(s):  
Picea Abies ◽  
Norway Spruce ◽  
Co2 Enrichment ◽  
Photosynthetic Performance ◽  
Needle Anatomy ◽  
Sun And Shade Needles ◽  
Sun And Shade ◽  
The Impact

scholarly journals Specific thylakoid protein phosphorylations are prerequisites for overwintering of Norway spruce (Picea abies) photosynthesis

2020 ◽  
Vol 117 (30) ◽  
pp. 17499-17509 ◽  
Author(s):  
Steffen Grebe ◽  
Andrea Trotta ◽  
Azfar Ali Bajwa ◽  
Ilaria Mancini ◽  
Pushan Bag ◽  
...  
Keyword(s):  
Picea Abies ◽  
Norway Spruce ◽  
Boreal Forests ◽  
Molecular Mechanisms ◽  
Temperature Dependent ◽  
Artificial Induction ◽  
Photosynthetic Machinery ◽  
Freezing Temperatures ◽  
Sun And Shade ◽  
Evergreen Conifers

Coping of evergreen conifers in boreal forests with freezing temperatures on bright winter days puts the photosynthetic machinery in great risk of oxidative damage. To survive harsh winter conditions, conifers have evolved a unique but poorly characterized photoprotection mechanism, a sustained form of nonphotochemical quenching (sustained NPQ). Here we focused on functional properties and underlying molecular mechanisms related to the development of sustained NPQ in Norway spruce (Picea abies). Data were collected during 4 consecutive years (2016 to 2019) from trees growing in sun and shade habitats. When day temperatures dropped below −4 °C, the specific N-terminally triply phosphorylated LHCB1 isoform (3p-LHCII) and phosphorylated PSBS (p-PSBS) could be detected in the thylakoid membrane. Development of sustained NPQ coincided with the highest level of 3p-LHCII and p-PSBS, occurring after prolonged coincidence of bright winter days and temperatures close to −10 °C. Artificial induction of both the sustained NPQ and recovery from naturally induced sustained NPQ provided information on differential dynamics and light-dependence of 3p-LHCII and p-PSBS accumulation as prerequisites for sustained NPQ. Data obtained collectively suggest three components related to sustained NPQ in spruce: 1) Freezing temperatures induce 3p-LHCII accumulation independently of light, which is suggested to initiate destacking of appressed thylakoid membranes due to increased electrostatic repulsion of adjacent membranes; 2) p-PSBS accumulation is both light- and temperature-dependent and closely linked to the initiation of sustained NPQ, which 3) in concert with PSII photoinhibition, is suggested to trigger sustained NPQ in spruce.

Resin acid variation in sun and shade needles of Scots pine (Pinussylvestris L.)

1987 ◽  
Vol 17 (4) ◽  
pp. 346-349 ◽  
Author(s):  
Rolf Gref ◽  
Olle Tenow
Keyword(s):  
Chemical Composition ◽  
Genetic Markers ◽  
Acid Content ◽  
Resin Acid ◽  
Resin Acids ◽  
Northern Sweden ◽  
Southern Sweden ◽  
Sun And Shade Needles ◽  
Sun And Shade

Bioclimatic and physiological differences between sun and shade needles suggest that their chemical composition should differ. An analysis of resin acid content demonstrated that although the same resin acids were found (i.e., levopimaric/palustric, dehydroabietic, abietic, neoabietic, 4-epiimbricatolic, pinifolic, and isopimaric acids), both individual and total resin concentrations were significantly higher in sun than in shade needles. These relationships were true for a dense 40-year-old pine stand in southern Sweden as well as for a dense 12-year-old stand in northern Sweden. The role of resin acids in defence against needle-eating insects and the relative susceptibilities of shade and sun needles to needle-attacking organisms are discussed. Variation in resin acid concentration in sun and shade needles should be considered when such acids are used as genetic markers.

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