Seasonal courses of maximum hydraulic conductance in shoots of six temperate deciduous tree species

2005 ◽  
Vol 32 (12) ◽  
pp. 1077 ◽  
Author(s):  
Krõõt Aasamaa ◽  
Anu Sõber
Keyword(s):  
Seasonal Dynamics ◽  
Tree Species ◽  
Hydraulic Conductance ◽  
Deciduous Tree ◽  
Salix Caprea ◽  
Seasonal Course ◽  
Relative Contribution ◽  
Temperate Deciduous ◽  
The Difference ◽  
Species Specific

The seasonal course of maximum hydraulic conductance of leaf laminae (K lamina) of shoots correlated strongly with the seasonal course of the maximum hydraulic conductance of leaf laminae of HgCl2-treated shoots (K lamina(HgCl2)), and with the seasonal course of the difference (dK lamina) between K lamina and K lamina(HgCl2). However, it did not correlate strongly with the seasonal course of the hydraulic conductance of stem and petioles of the shoot (K stpt) in six temperate deciduous tree species. The species ranked according to K lamina as follows: Populus tremula L. > Salix caprea L. > Padus avium Mill. > Quercus robur L. > Tilia cordata Mill. > Acer platanoides L. The species-specific maxima of K lamina correlated positively with the simultaneous values of K lamina(HgCl2), dK lamina and K stpt; the correlation was strongest with K lamina(HgCl2). It was concluded that the seasonal dynamics of maximum hydraulic conductance of leaf laminae was determined almost equally by the seasonal dynamics of the hydraulic conductance of foliar protoplasts and apoplast, but the inter-specific differences in K lamina were mainly caused by the different apoplastic hydraulic conductance in leaves of these species. The relative contribution of dK lamina (in K lamina) was highest in slow-growing species (~55% in A. platanoides) and the lowest in fast-growers (~30% in S. caprea).

Light sensitivity of shoot hydraulic conductance in five temperate deciduous tree species

2012 ◽  
Vol 39 (8) ◽  
pp. 661 ◽  
Author(s):  
Krõõt Aasamaa ◽  
Anu Sõber
Keyword(s):  
Stomatal Conductance ◽  
Water Potential ◽  
Water Use ◽  
Tree Species ◽  
Light Sensitivity ◽  
Hydraulic Conductance ◽  
Leaf Water ◽  
Deciduous Tree ◽  
Temperate Deciduous ◽  
Shoot Hydraulic Conductance

The light sensitivity of the shoot hydraulic conductance in five temperate deciduous tree species was measured using two methods to clarify the role of light sensitivity and the suitability of the methods used to study it. The light sensitivity measured using a method that included an interruption of ≤10 min in shoot light acclimation did not differ from that measured using a method with continuous illumination. The ‘noncontinuous light’ methods are suitable for measuring hydraulic conductance and its light response. Light sensitivity correlated with other leaf water traits as follows: positively with the ion-mediated increase in xylem hydraulic conductance; a relative decrease in the hydraulic conductance of the laminae in response to HgCl2; a relative change in stomatal conductance in response to changes in PAR intensity or atmospheric CO2 concentration, or to a decrease in air humidity or leaf water potential; and with instantaneous water use efficiency. The traits correlated negatively with shoot hydraulic conductance, stomatal conductance and relative increases in stomatal conductance in response to increases in leaf water potential. We suggest that high light sensitivity should be considered as one of the characteristics of conservative water use in trees. Low blue light increased shoot hydraulic conductance to a similar extent to moderate white light and twice as much as moderate red light. Blue light perception is important in the light sensitivity mechanism.

scholarly journals Warming increases the sensitivity of seedling growth capacity to rainfall in six temperate deciduous tree species

AoB Plants ◽  
2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Vikki L Rodgers ◽  
Nicholas G Smith ◽  
Susanne S Hoeppner ◽  
Jeffrey S Dukes
Keyword(s):  
Seedling Growth ◽  
Tree Species ◽  
Deciduous Tree ◽  
Growth Capacity ◽  
Temperate Deciduous

scholarly journals Flux-Based Ozone Risk Assessment for a Plant Injury Index (PII) in Three European Cool-Temperate Deciduous Tree Species

Forests ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 82 ◽  
Author(s):  
Yasutomo Hoshika ◽  
Elisa Carrari ◽  
Barbara Mariotti ◽  
Sofia Martini ◽  
Alessandra De Marco ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Tree Species ◽  
Growth Patterns ◽  
Deciduous Tree ◽  
Visible Injury ◽  
Injury Index ◽  
Leaf Formation ◽  
Plant Level ◽  
Plant Injury ◽  
Species Specific

This study investigated visible foliar ozone (O3) injury in three deciduous tree species with different growth patterns (indeterminate, Alnus glutinosa (L.) Gaertn.; intermediate, Sorbus aucuparia L.; and determinate, Vaccinium myrtillus L.) from May to August 2018. Ozone effects on the timing of injury onset and a plant injury index (PII) were investigated using two O3 indices, i.e., AOT40 (accumulative O3 exposure over 40 ppb during daylight hours) and PODY (phytotoxic O3 dose above a flux threshold of Y nmol m−2 s−1). A new parameterization for PODY estimation was developed for each species. Measurements were carried out in an O3 free-air controlled exposure (FACE) experiment with three levels of O3 treatment (ambient, AA; 1.5 × AA; and 2.0 × AA). Injury onset was found in May at 2.0 × AA in all three species and the timing of the onset was determined by the amount of stomatal O3 uptake. It required 4.0 mmol m−2 POD0 and 5.5 to 9.0 ppm·h AOT40. As a result, A. glutinosa with high stomatal conductance (gs) showed the earliest emergence of O3 visible injury among the three species. After the onset, O3 visible injury expanded to the plant level as confirmed by increased PII values. In A. glutinosa with indeterminate growth pattern, a new leaf formation alleviated the expansion of O3 visible injury at the plant level. V. myrtillus showed a dramatic increase of PII from June to July due to higher sensitivity to O3 in its flowering and fruiting stage. Ozone impacts on PII were better explained by the flux-based index, PODY, as compared with the exposure-based index, AOT40. The critical levels (CLs) corresponding to PII = 5 were 8.1 mmol m−2 POD7 in A. glutinosa, 22 mmol m−2 POD0 in S. aucuparia, and 5.8 mmol m−2 POD1 in V. myrtillus. The results highlight that the CLs for PII are species-specific. Establishing species-specific O3 flux-effect relationships should be key for a quantitative O3 risk assessment.

scholarly journals Broad Leaf Trees as Reservoirs for Phytoseiid Mites (Acari: Phytoseiidae)

2011 ◽  
Vol 39 (No. 2) ◽  
pp. 65-69 ◽  
Author(s):  
J. Kabíček
Keyword(s):  
Species Diversity ◽  
Fagus Sylvatica ◽  
Tree Species ◽  
Quercus Robur ◽  
Betula Pendula ◽  
Deciduous Tree ◽  
Acer Platanoides ◽  
Phytoseiid Mites ◽  
Salix Caprea ◽  
Broad Leaf

The possibility that broad leaf trees can be reservoirs for phytoseiid mites was investigated by determining their occurrence and species diversity on common deciduous tree species. No phytoseiid mites were found on Betula pendula and Populus tremula. Altogether  280 specimens of phytoseiids belonging to six species (Neoseiulella ace-ri, N. tiliarum, Paraseiulus soleiger, Euseius finlandicus, Phytoseius severus, Typhlodromus rhenanus) were found on Acer platanoides, Fagus sylvatica, Quercus robur and Salix caprea. Ph. severus was the dominant phytoseiid species on S. caprea, while N. aceri was most abundant on A. platanoides. The greatest abundance and species diversity of phytoseiids were found on S. caprea that can thus constitute an excellent reservoir for some phytoseiid mites, particularly Phytoseius spp.  

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