Trees
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Natural root grafting in hybrid poplar clones
Trees - - 2020
Root grafting occurs in 15-year-old hybrid poplar clones; and tree proximity, tree and root sizes are key factors enhancing its frequency. Root grafting in trees is a well-recognized phenomenon allowing nutrient and photosynthate redistribution between connected trees. This study assessed the influence of tree spacing on root graft formation in a 15-year-old hybrid poplar plantation with two clone......
Drought sensitivity of three co-occurring conifers within a dry inner Alpine environment
Trees - Tập 27 - Trang 61-69 - 2012
We applied dendroclimatological techniques to determine long-term stationarity of climate–growth relationships and recent growth trends of three widespread coniferous tree species of the central Austrian Alps, which grow intermixed at dry mesic sites within a dry inner Alpine environment (750 m asl). Time series of annual increments were developed from >120 mature trees of Picea abies, Larix decid......
Diurnal changes in branch diameter as indicator of water status of Hinoki cypress Chamaecyparis obtusa
Trees - Tập 15 - Trang 315-318 - 2001
We investigated use of strain gauges for monitoring the water status of trees by measuring changes in the diameter of the largest spreading branch of a 27-year-old Chamaecyparis obtusa tree. The change in xylem diameter in the branch is more closely related than the change in phloem diameter to the change in leaf water potential. Since the diurnal changes in diameter match the diurnal changes in ......
Correlation between the seasonal changes in electrogenic activity across root xylem/symplast interface, sap-flow rate and xylem pressure in field trees (Diospyros kaki)
Trees - Tập 21 - Trang 433-442 - 2007
To investigate the seasonal changes in the physiological activity of the roots in field trees, Diospyros kaki, we carried out simultaneous and continuous measurements of the trans-root electric potential (TRP), of the rate of sap-flow with transpiration and of the xylem pressure (Px) through several years. The amplitude of the diurnal change and its temperature dependency of both TRP and Px began ......
Molecular characterization and functional analysis of a cation-chloride cotransporter gene from trifoliate orange (Poncirus trifoliata L.)
Trees - Tập 32 - Trang 165-173 - 2017
A cation-chloride cotransporter gene PtrCCC from trifoliate orange was identified, its ectopic expression confers salt tolerance in transgenic tobacco. Salinity is one of the most serious environmental stresses that limit crop growth. Cation-chloride cotransporters (CCCs) are membrane proteins that are involved in plant development and salt tolerance. Here we provide an insight into the molecular ......
Intra-annual stem radial increment patterns of Chinese pine, Helan Mountains, Northern Central China
Trees - Tập 33 - Trang 751-763 - 2019
We investigate the intra-annual growth patterns of Chinese pine in Helan Mountains, confirming that regional water status plays a dominated role in stem radial increment. The associations between environmental conditions and stem radial increment (SRI) are useful for assessing a species’ growth response to climate change. Intra-annual SRI dynamics of Chinese pine (Pinus tabulaeformis) were monitor......
Xylem anatomical traits related to resinous heartwood formation in Pinus canariensis Sm.
Trees - Tập 12 - Trang 139-145 - 1998
Resinous heartwood (lightwood) is an important feature in Pinus canariensis (Canary Island pine), as this wood has very good mechanical and aesthetic characteristics. In order to determine anatomical traits related to lightwood formation, structure of axial resin canals, xylem cell connections and cell contents were studied on wood samples from sites with different environments. Specimens consist......
Spring precipitation effects on formation of first row of earlywood vessels in Quercus variabilis at Qinling Mountain (China)
Trees - Tập 33 - Trang 457-468 - 2018
Under drier spring conditions, Q. variabilis might slow the FEV growth rate but will not produce narrower FEVs. FEV size might be a trade-off between hydraulic efficiency and hydraulic safety. Wood anatomical features can encode tree reactions to fluctuating environmental conditions. The first row of earlywood vessels (FEV) has proven to be very promising with respect to the inter-annual climate v......
Development of biomass proportions in Norway spruce (Picea abies [L.] Karst.)
Trees - Tập 20 - Trang 111-121 - 2005
This study tests the hypotheses that (1) the above-ground structure of Norway spruce (Picea abies [L] Karst.) is derivable from the functional balance theory, and that (2) crown ratio is a key source of structural variation in trees of different age and social position. Twenty-nine trees were measured in three stands (young, middle-aged, and mature), with three thinning treatments (unthinned, norm......
Nitrate reduction and nitrate content in ash trees (Fraxinus excelsior L.): distribution between compartments, site comparison and seasonal variation
Trees - Tập 6 - Trang 236-240 - 1992
Nitrate reductase activity (NRA), nitrate content and biomass components of leaflets, leaf stalks, old stem, current-year stem and roots of ash trees (Fraxinus excelsior L.) growing in their natural habitats were investigated. In addition, NRA, total nitrogen and nitrate concentration were analyzed in the leaves and roots of ash trees from four different field sites. The highest NRA per gram bioma......
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