scholarly journals Interactive effects of nitrogen and water availabilities on gas exchange and whole-plant carbon allocation in poplar

1998 ◽  
Vol 18 (7) ◽  
pp. 481-487 ◽  
Author(s):  
L. Ibrahim ◽  
M. F. Proe ◽  
A. D. Cameron
Keyword(s):  
Gas Exchange ◽  
Carbon Allocation ◽  
Interactive Effects ◽  
Whole Plant

scholarly journals Whole plant chamber to examine sensitivity of cereal gas exchange to changes in evaporative demand

Plant Methods ◽  
2018 ◽  
Vol 14 (1) ◽  
Author(s):  
Iván Jauregui ◽  
Shane A. Rothwell ◽  
Samuel H. Taylor ◽  
Martin A. J. Parry ◽  
Elizabete Carmo-Silva ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Evaporative Demand ◽  
Whole Plant

scholarly journals Gas exchange at whole plant level shows that a less conservative water use is linked to a higher performance in three ecologically distinct pine species

2018 ◽  
Vol 13 (4) ◽  
pp. 045004 ◽  
Author(s):  
D Salazar-Tortosa ◽  
J Castro ◽  
R Rubio de Casas ◽  
B Viñegla ◽  
E P Sánchez-Cañete ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Water Use ◽  
Whole Plant ◽  
Plant Level ◽  
Pine Species

Variability in hydraulic architecture and gas exchange of common bean (Phaseolus vulgaris) cultivars under well-watered conditions: interactions with leaf size

1999 ◽  
Vol 26 (2) ◽  
pp. 115 ◽  
Author(s):  
Maurizio Mencuccini ◽  
Jonathan Comstock
Keyword(s):  
Gas Exchange ◽  
Exchange Rates ◽  
Common Bean ◽  
Water Loss ◽  
Leaf Size ◽  
Hydraulic Conductance ◽  
Hydraulic Architecture ◽  
Greenhouse Study ◽  
Whole Plant ◽  
Leaf Level

In a greenhouse study, 12 common bean cultivars from a wide geographical range were compared for their morphological, gas exchange and hydraulic architecture characters. Cultivars bred for cultivation in hot and dry regions had significantly smaller leaves and crowns, but higher stomatal conductances and transpiration rates per unit of leaf area. Short-term variability in gas exchange rates was confirmed using leaf carbon isotope discrimination. A literature survey showed that, although previously unnoticed, the strong inverse coupling between leaf size and gas exchange rates was present in three other studies using the same set of cultivars. Several measures of ‘leaf-specific hydraulic conductance’ (i.e. for the whole plant and for different parts of the xylem pathway) were also linearly related to rates of water loss, suggesting that the coupling between leaf size and gas exchange was mediated by a hydraulic mechanism. It is possible that breeding for high production in hot regions has exerted a selection pressure to increase leaf-level gas exchange rates and leaf cooling. The associated reductions in leaf size may be explained by the need to maintain equilibrium between whole-plant water loss and liquid-phase hydraulic conductance.

Responses of vegetative and reproductive traits to elevated CO2 and nitrogen in Raphanus varieties

1997 ◽  
Vol 75 (4) ◽  
pp. 533-545 ◽  
Author(s):  
Leanne M. Jablonski
Keyword(s):  
Carbon Allocation ◽  
Reproductive Traits ◽  
Test System ◽  
Total Biomass ◽  
Raphanus Raphanistrum ◽  
Reproductive Phase ◽  
Reproductive Response ◽  
Whole Plant ◽  
Vegetative Biomass ◽  
Source Sink

The relationships between the responses to elevated CO2 of the vegetative and reproductive phase were investigated in radish, used as a test system. The hypothesis that an increase in nonfoliar vegetative storage capacity promotes reproductive output was tested. Three cultivars of Raphanus sativus and the wild, Raphanus raphanistrum, differing in root to shoot ratios, were grown under two levels of CO2 and two levels of nitrogen fertilization. Varieties possessed different strategies of carbon storage and showed distinct responses to CO2 at each vegetative harvest time. Vegetative sinks of hypocotyls, petioles, and young blades were enhanced by CO2. Nitrogen promoted vegetative shoot growth, but did not enhance the reproductive response to CO2. By the end of the reproductive phase, varieties did not differ in total biomass. Reproductive response to CO2 may have been limited by the lack of an effect on the timing of flowering. Correlations in CO2 enhancement ratios were examined in 12 traits of each phase. Only vegetative total leaf area correlated with reproductive mass. Foliar starch correlated with decreased abortion. Enhancements in vegetative biomass did not correlate with any reproductive response. Detailed studies of the reproductive phase are needed to understand the whole-plant response to elevated CO2. Key words: elevated CO2, plant reproduction, nitrogen, starch, carbon allocation, source–sink.

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