scholarly journals Leaf gas exchange in a clonal eucalypt plantation as related to soil moisture, leaf water potential and microclimate variables

Trees ◽  
2000 ◽  
Vol 14 (5) ◽  
pp. 0263 ◽  
Author(s):  
M. S. Mielke ◽  
M. A. Oliva ◽  
N.F. de Barros ◽  
R. M. Penchel ◽  
C. A. Martinez ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Gas Exchange ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Leaf Gas Exchange ◽  
Leaf Water ◽  
Eucalypt Plantation ◽  
Microclimate Variables

scholarly journals Seasonal leaf gas exchange and water potential in a woody cerrado species community

2004 ◽  
Vol 16 (1) ◽  
pp. 7-16 ◽  
Author(s):  
Carlos Henrique Britto de Assis Prado ◽  
Zhang Wenhui ◽  
Manuel Humberto Cardoza Rojas ◽  
Gustavo Maia Souza
Keyword(s):  
Gas Exchange ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Dry Season ◽  
Leaf Water ◽  
Wet Season ◽  
Leaf Water Status ◽  
Mean Values

Predawn leaf water potential (psipd) and morning values of leaf gas exchange, as net photosynthesis (A), stomatal conductance (gs), transpiration (E), and morning leaf water potential (psimn) were determined seasonally in 22 woody cerrado species growing under natural conditions. Despite the lower mean values of psipd in the dry season (-0.35 ± 0.23 MPa) compared to the wet season (-0.08 ± 0.03 MPa), the lowest psipd in the dry season (-0.90 ± 0.00 MPa) still showed a good nocturnal leaf water status recovery for all species studied through out the year. Mean gs values dropped 78 % in the dry season, when the vapor pressure of the air was 80% greater than in the wet season. This reduction in gs led to an average reduction of 33% in both A and E, enabling the maintainance of water use efficiency (WUE) during the dry season. Network connectance analysis detected a change in the relationship between leaf gas exchange and psimn in the dry season, mainly between gs-E and E-WUE. A slight global connectance value increase (7.25 %) suggested there was no severe water stress during the dry season. Multivariate analysis showed no link between seasonal response and species deciduousness, suggesting similar behavior in remaining leaves for most of the studied species concerning leaf gas exchange and psimn under natural drought.

scholarly journals Water status and gas exchange of umbu plants (Spondias tuberosa Arr. Cam.) propagated by seeds and stem cuttings

2007 ◽  
Vol 29 (2) ◽  
pp. 355-358 ◽  
Author(s):  
José Moacir Pinheiro Lima Filho
Keyword(s):  
Stomatal Conductance ◽  
Gas Exchange ◽  
Water Potential ◽  
Soil Water ◽  
Water Deficit ◽  
Leaf Water Potential ◽  
Leaf Gas Exchange ◽  
Leaf Water ◽  
Soil Water Deficit ◽  
Stem Cuttings

The experiment was carried out at the Embrapa Semi-Árido, Petrolina-PE, Brazil, in order to study the physiological responses of umbu plants propagated by seeds and by stem cuttings under water stress conditions, based on leaf water potential and gas exchange measurements. Data were collected in one-year plants established in pots containing 30 kg of a sandy soil and submitted to twenty-day progressive soil water deficit. The evaluations were based on leaf water potential and gas exchange data collection using psychrometric chambers and a portable infra-red gas analyzer, respectively. Plants propagated by seeds maintained a significantly higher water potential, stomatal conductance, transpiration and photosynthesis under decreasing soil water availability. However, plants propagated by stem cuttings were unable to maintain a favorable internal water balance, reflecting negatively on stomatal conductance and leaf gas exchange. This fact is probably because umbu plants propagated by stem cuttings are not prone to formation of root tubers which are reservoirs for water and solutes. Thus, the establishing of umbu plants propagated by stem cuttings must be avoided in areas subjected to soil water deficit.

scholarly journals Flooding, Leaf Gas Exchange, and Growth of Mango in Containers

1991 ◽  
Vol 116 (1) ◽  
pp. 156-160 ◽  
Author(s):  
Kirk D. Larson ◽  
Bruce Schaffer ◽  
Frederick S. Davies
Keyword(s):  
Gas Exchange ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Vegetative Growth ◽  
Tree Mortality ◽  
Leaf Gas Exchange ◽  
Mangifera Indica ◽  
Dry Weight ◽  
Leaf Water ◽  
Soil Conditions

The effect of flooding on container-grown `Tommy Atkins' mango (Mangifera indica L.) trees on two rootstock, and on container-grown seedling `Peach' mango trees, was investigated by evaluating vegetative growth, net gas exchange, and leaf water potential. In general, flooding simultaneously reduced net CO2 assimilation (A) and stomatal conductance (gs) after 2 to 3 days. However, flooding did not affect leaf water potential, shoot extension growth, or shoot dry weight, but stem radial growth and root dry weight were reduced, resulting in larger shoot: root ratios for flooded trees. Mortality of flooded trees ranged from 0% to 45% and was not related to-rootstock scion combination. Hypertrophied lenticels were observed on trees that survived flooding but not on trees that died. The reductions in gas exchange, vegetative growth, and the variable tree mortality indicate that mango is not highly flood-tolerant but appears to possess certain adaptations to flooded soil conditions.

scholarly journals Variation of leaf water potential and leaf gas exchange parameters of seven Silver linden (Tilia tomentosa Moench) genotypes in urban environment

Topola ◽  
2020 ◽  
pp. 15-24
Author(s):  
Lazar Kesić ◽  
Vanja Vuksanović ◽  
Velisav Karaklić ◽  
Erna Vaštag
Keyword(s):  
Gas Exchange ◽  
Water Potential ◽  
Urban Environment ◽  
Leaf Water Potential ◽  
Leaf Gas Exchange ◽  
Intercellular Co2 Concentration ◽  
Leaf Water ◽  
Gas Exchange Parameters ◽  
Tilia Tomentosa ◽  
Exchange Parameters

Differences between genotypes are considered to be the most important requisite for a resilient urban forest. Analyses of physiological traits, such as leaf water potential and leaf gas exchange could provide useful insight into the capacity of different species and genotypes to grow in harsh urban environments. In the present study, a variation of midday (Psmd) and predawn (Pspd) leaf water potential, net photosynthesis (A), rate of transpiration (E), stomatal conductance (gs), and intercellular CO2 concentration (Ci) of seven Silver linden genotypes (Tilia tomentosa Moench), planted in the urban environment in Novi Sad, were examined. Analysis of variance and LSD tests were used to show differences between studied silver linden genotypes. The results showed significant differences for all observed leaf gas exchange parameters (A, E, gs, Ci, Pspd and Psmd) between genotypes. The results indicate better physiological performances of genotypes T3, in comparison to other observed genotypes under the prevailing environmental condition of the studied site in the urban environment.

scholarly journals Wine Grape Response to Foliar Particle Film under Differing Levels of Preveraison Water Stress

HortScience ◽  
2008 ◽  
Vol 43 (5) ◽  
pp. 1392-1397 ◽  
Author(s):  
Krista Shellie ◽  
D. Michael Glenn
Keyword(s):  
Water Stress ◽  
Gas Exchange ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Leaf Gas Exchange ◽  
Leaf Water ◽  
Soluble Solids ◽  
Wine Grape ◽  
Solids Concentration ◽  
Soluble Solids Concentration

We investigated how foliar application of kaolin particle film influenced diurnal leaf gas exchange, leaf water potential, yield, and berry maturity of a red (‘Merlot’) and white (‘Viognier’) wine grape (Vitis vinifera L.) cultivar under differing levels of water stress over two growing seasons (2005 and 2006) in the warm, semiarid climate of southwestern Idaho. Net diurnal stomatal conductance (g S) was increased by particle film and the effect varied according to vine water status. Particle film delayed the onset of diurnal decline in g S under mild water stress (leaf water potential ≈ –1.2 MPa) but had no influence on leaf gas exchange when vines were under greater water stress (leaf water potential ≈ –1.4 MPa). Correlation between soluble solids concentration and titratable acidity (‘Viognier’) and between berry fresh weight and yield (‘Merlot’) was higher with than without particle film, suggesting that particle film may attenuate the influence of other factors affecting expression of these traits. Particle film was associated with an increase in berry weight in ‘Merlot’ and with an increase in berry soluble solids concentration in ‘Viognier’, suggesting that the film may increase vine-carrying capacity. Midday leaf water potential throughout the growing season was not influenced by particle film. Fruit surface browning was observed on deficit-irrigated, particle film-treated vines on exposed clusters on the west side of the canopy, indicating that the film did not eliminate development of heat stress symptoms on fruit under the most extreme environmental conditions evaluated in this study.

scholarly journals The Effect of Grapevine Age (Vitis vinifera L. cv. Zinfandel) on Phenology and Gas Exchange Parameters over Consecutive Growing Seasons

Plants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 311
Author(s):  
Vegas Riffle ◽  
Nathaniel Palmer ◽  
L. Federico Casassa ◽  
Jean Catherine Dodson Peterson
Keyword(s):  
Gas Exchange ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Management Practices ◽  
Leaf Water ◽  
Sugar Accumulation ◽  
Gas Exchange Parameters ◽  
Growing Season Length ◽  
Growing Seasons ◽  
Exchange Parameters

Unlike most crop industries, there is a strongly held belief within the wine industry that increased vine age correlates with quality. Considering this perception could be explained by vine physiological differences, the purpose of this study was to evaluate the effect of vine age on phenology and gas exchange parameters. An interplanted, dry farmed, Zinfandel vineyard block under consistent management practices in the Central Coast of California was evaluated over two consecutive growing seasons. Treatments included Young vines (5 to 12 years old), Control (representative proportion of young to old vines in the block), and Old vines (40 to 60 years old). Phenology, leaf water potential, and gas exchange parameters were tracked. Results indicated a difference in phenological progression after berry set between Young and Old vines. Young vines progressed more slowly during berry formation and more rapidly during berry ripening, resulting in Young vines being harvested before Old vines due to variation in the timing of sugar accumulation. No differences in leaf water potential were found. Young vines had higher mid-day stomatal conductance and tended to have higher mid-day photosynthetic rates. The results of this study suggest vine age is a factor in phenological timing and growing season length.

Changes in root system structure, leaf water potential and gas exchange of maize and triticale seedlings affected by soil compaction

2013 ◽  
Vol 88 ◽  
pp. 2-10 ◽  
Author(s):  
Stanisław Grzesiak ◽  
Maciej T. Grzesiak ◽  
Tomasz Hura ◽  
Izabela Marcińska ◽  
Andrzej Rzepka
Keyword(s):  
Gas Exchange ◽  
Water Potential ◽  
Root System ◽  
Leaf Water Potential ◽  
Soil Compaction ◽  
Leaf Water ◽  
System Structure ◽  
Root System Structure
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