Changes in specific leaf area and photosynthetic nitrogen-use efficiency associated with physiological acclimation of two hybrid poplar clones to intraclonal competition

2011 ◽  
Vol 41 (7) ◽  
pp. 1465-1476 ◽  
Author(s):  
Lahcen Benomar ◽  
Annie DesRochers ◽  
Guy R. Larocque
Keyword(s):  
Leaf Area ◽  
Specific Leaf Area ◽  
Populus Trichocarpa ◽  
Hybrid Poplar ◽  
Growing Seasons ◽  
Poplar Clones ◽  
Use Efficiency ◽  
Intraclonal Competition ◽  
Physiological Acclimation ◽  
Two Hybrid

Photosynthesis is the most important process driving productivity, and its acclimation to intraclonal competition is not well understood in hybrid poplars. The aim of this study was to examine the physiological response of the crown of two hybrid poplar clones, BT747215 ( Populus balsamifera L. × Populus trichocarpa Torr. & A. Gray) and MB915319 ( Populus maximowiczii A. Henry × P. balsamifera ), to intraclonal competition. We measured light-saturated photosynthesis (Amax), leaf N content on an area basis (Narea), specific leaf area (SLA), and photosynthetic N-use efficiency (PNUE) for three successive growing seasons on trees planted at three spacings (1 m × 1 m, 3 m × 3 m, and 5 m × 5 m). Crowns were sampled at 10 locations corresponding to vertical and horizontal subdivisions. Significant changes took place at the crown level in the closest spacing (1 m × 1 m) compared with the wider spacings (3 m × 3 m and 5 m × 5 m): (i) 30% decrease in Narea, (ii) 20% increase in SLA, and (iii) 40% increase in PNUE. The slope of the Amax–Narea curve was greatest in the closest spacing, indicating a greater change in Amax per unit change in Narea. The two hybrid poplar clones had a similar morphophysiological response to changes of spacing. Both clones showed physiological acclimation of their foliage in response to intraclonal competition through modulation of SLA and PNUE.

Influence of light fleck and low light on foliar injury and physiological responses of two hybrid poplar clones to ozone

2004 ◽  
Vol 130 (2) ◽  
pp. 215-227 ◽  
Author(s):  
C. Wei ◽  
J.M. Skelly ◽  
S.P. Pennypacker ◽  
J.A. Ferdinand ◽  
J.E. Savage ◽  
...  
Keyword(s):  
Physiological Responses ◽  
Hybrid Poplar ◽  
Foliar Injury ◽  
Low Light ◽  
Poplar Clones ◽  
Two Hybrid

Distribution of Recent Photosynthates in Saplings of Two Hybrid Poplar Clones

2010 ◽  
Vol 41 (8) ◽  
pp. 1004-1015 ◽  
Author(s):  
Carmela B. M. Arevalo ◽  
Jagtar S. Bhatti ◽  
Scott X. Chang ◽  
Derek Sidders
Keyword(s):  
Hybrid Poplar ◽  
Poplar Clones ◽  
Two Hybrid

Late-season changes in allocation of starch and sugar to shoots, coarse roots, and fine roots in two hybrid poplar clones

1990 ◽  
Vol 7 (1-2-3-4) ◽  
pp. 95-105 ◽  
Author(s):  
Phu V. Nguyen ◽  
Donald I. Dickmann ◽  
Kurt S. Pregitzer ◽  
R. Hendrick
Keyword(s):  
Fine Roots ◽  
Hybrid Poplar ◽  
Coarse Roots ◽  
Late Season ◽  
Poplar Clones ◽  
Two Hybrid

scholarly journals Abundant Pathogenic Variation in the New Hybrid Rust Melampsora ×columbiana on Hybrid Poplar

2001 ◽  
Vol 91 (10) ◽  
pp. 981-985 ◽  
Author(s):  
George Newcombe ◽  
Brigid Stirling ◽  
H. D. Bradshaw
Keyword(s):  
Linkage Group ◽  
Latent Period ◽  
Resistance Genes ◽  
Quantitative Traits ◽  
Infection Type ◽  
Populus Trichocarpa ◽  
Hybrid Poplar ◽  
Poplar Clones ◽  
Pathogenic Variation

The recently described rust hybrid Melampsora ×columbiana was discovered as a result of its novel pathogenic variation on Populus trichocarpa × P. deltoides (T×D) hybrid poplar. To characterize this pathogenic variation, 10 commercial T×D clones, all F1 clones, were chosen as host differentials. Fourteen mononuredinial isolates of Pacific Northwestern field collections of M. ×columbiana, from 1996 to 1998 inclusive, were determined to be 13 distinct pathotypes. In contrast, four Southeastern isolates of M. medusae could not be distinguished on the same T×D host differentials, although they can be distinguished as pathotypes using P. deltoides differentials. The first three pathotypes of M. ×columbiana (Mxc1, Mxc2, and Mxc3) and a Mississippi isolate of M. medusae were inoculated onto a three-generation T×D pedigree, formerly used to characterize the Mmd1 gene for resistance to M. medusae. Resistance to the Mxc3 pathotype mapped to the same linkage group (group Q) as the Mmd1 gene. In contrast, linked genes for resistance to Mxc1 and to Mxc2 were located on linkage group O, and were unlike Mmd1 and Mxc3 in that they were inherited from P. deltoides. The latter two genes resembled Mmd1 and Mxc3 in that infection type was correlated with quantitative traits such as uredinial density and latent period. Pathogenic variation in M. ×columbiana matches resistance genes from both P. trichocarpa and P. deltoides and reveals the vulnerability to hybrid rust of commercial T×D hybrid poplar clones.

scholarly journals Thermal acclimation of photosynthetic activity and Rubisco content in two hybrid poplar clones

2018 ◽  
Author(s):  
Lahcen Benomar ◽  
Mohamed. Taha Moutaoufik ◽  
Raed Elferjani ◽  
Nathalie Isabel ◽  
Annie DesRochers ◽  
...  
Keyword(s):  
Activation Energy ◽  
Stomatal Conductance ◽  
Growth Temperature ◽  
Dark Respiration ◽  
Hybrid Poplar ◽  
Rubisco Activase ◽  
Thermal Acclimation ◽  
Warm Condition ◽  
Poplar Clones ◽  
Two Hybrid

AbstractThe mechanistic bases of thermal acclimation of net photosynthetic rate (An) are still difficult to discern and empirical research remains limited, particularly for hybrid poplar. In the present study, we examined the contribution of a number of biochemical and biophysical traits on thermal acclimation of An for two hybrid poplar clones. We grew cuttings of Populus maximowiczii × Populus nigra (M×N) and Populus maximowiczii × Populus balsamifera (M×B) clones under two day/night temperature of 23°C/18°C and 33°C /27°C and under low and high soil nitrogen level. After 10 weeks, we measured leaf RuBisCO and RuBisCO activase (RCA) amounts and the temperature response of An, dark respiration (Rd), stomatal conductance, (gs), maximum carboxylation rate of CO2 (Vcmax) and photosynthetic electron transport rate (J). Results showed that a 10°C increase in growth temperature resulted in a shift in thermal optimum (Topt) of An of 6.2±1.6 °C and 8.0±1.2 °C for clone M×B and M×N respectively, and an increased An and gs at the growth temperature for clone M×B but not M×N. RuBisCO amount was increased by N level but was insensitive to growth temperature while RCA amount and the ratio of its short to long isoform was stimulated by warm condition for clone M×N and at low N for clone M×B. The activation energy of Vcmax and J decreased under warm condition for clone M×B and remain unchanged for clone M×N. Our study demonstrated the involvement of both RCA, activation energy of Vcmax and stomatal conductance in thermal acclimation of An.

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