Gas exchange rates at different vapor pressure deficits and water relations of ‘Pera’ sweet orange plants with citrus variegated chlorosis (CVC)

2003 ◽  
Vol 98 (3) ◽  
pp. 233-245 ◽  
Author(s):  
Gustavo Habermann ◽  
Eduardo Caruso Machado ◽  
João Domingos Rodrigues ◽  
Camilo Lázaro Medina
Keyword(s):  
Gas Exchange ◽  
Vapor Pressure ◽  
Exchange Rates ◽  
Water Relations ◽  
Sweet Orange ◽  
Citrus Variegated Chlorosis

scholarly journals Responses of gas-exchange rates and water relations to annual fluctuations of weather in three species of urban street trees

2014 ◽  
Vol 34 (10) ◽  
pp. 1056-1068 ◽  
Author(s):  
Y. Osone ◽  
S. Kawarasaki ◽  
A. Ishida ◽  
S. Kikuchi ◽  
A. Shimizu ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Exchange Rates ◽  
Water Relations ◽  
Street Trees ◽  
Urban Street

Gas Exchange, Water Relations and Ion Concentrations of Leaves of Salt Stressed 'Valencia' Orange, Citrus sinensis (L.) Osbeck

1987 ◽  
Vol 14 (4) ◽  
pp. 387 ◽  
Author(s):  
J Lloyd ◽  
PE Kriedemann ◽  
JP Syvertsen
Keyword(s):  
Gas Exchange ◽  
Water Relations ◽  
Citrus Sinensis ◽  
Sweet Orange ◽  
Leaf Gas Exchange ◽  
Co2 Assimilation ◽  
Salt Treatment ◽  
Soil Culture ◽  
Co2 Compensation Point ◽  
Valencia Orange

'Valencia' orange [Citrus sinensis (L.) Osbeck] scions grafted on sweet orange [C. sinensis (L.) Osbeck cv. Parramatta sweet orange] rootstock were grown in soil culture under controlled environmental conditions. Salt stress was imposed by adding NaCl to the nutrient solution in increments of 5 mol m-3 per day to a final concentration of 50 mol m-3. Leaf gas exchange, water relations and sodium, chloride and potassium concentrations were monitored until 89 days after commencement of salt treatment. Initial CO2 assimilation rates were relatively low (2.8-4.4 �mol CO2 m-2 s-1) and were stimulated by 72-86% when ambient oxygen partial pressure was reduced from 210 mbar to 21 mbar. After 14 days salt treatment, there was an increase in assimilation rate of approximately 20% associated with a decrease in osmotic potential (π) of 0.6 MPa. Reduction in � occurred without foliar ion accumulation. Assimilation rates gradually declined thereafter, averaging less than 1 �mol CO2m-2 s-1 at day 89. Lower CO2 assimilation rates were not a consequence of increased photorespiration as no change in the extent of oxygen inhibition of CO2 assimilation or CO2 compensation point occurred with salinisation. Stomatal conductance appeared less sensitive to salt treatment than intrinsic photosynthesis, resulting in higher intercellular partial pressures of CO2 in salt stressed leaves (291 cf. 259 pbar for controls at day 89). Water use efficiency was accordingly lower in salt affected leaves. Salinised leaves had consistently more negative osmotic potentials than control leaves; turgor potential was thus maintained at or above control levels for a given bulk-leaf water potential. Since leaf turgor was maintained via osmotic adjustment and uptake of sodium and chloride, lower assimilation rates were attributed to a toxic ion effect.

Effect of Mycorrhizal Fungi on Gas Exchange of Micropropagated Guava Plantlets (Psidium guajava L.) during Acclimatization and Plant Establishment

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 501c-501
Author(s):  
Andrés A. Estrada-Luna ◽  
Jonathan N. Egilla ◽  
Fred T. Davies
Keyword(s):  
Tissue Culture ◽  
Stomatal Conductance ◽  
Gas Exchange ◽  
Vapor Pressure ◽  
Mycorrhizal Fungi ◽  
Vapor Pressure Deficit ◽  
Psidium Guajava ◽  
Glomus Etunicatum ◽  
Plant Establishment ◽  
Use Efficiency

The effect of mycorrhizal fungi on gas exchange of micropropagated guava plantlets (Psidium guajava L.) during acclimatization and plant establishment was determined. Guava plantlets (Psidium guajava L. cv. `Media China') were asexually propagated through tissue culture and acclimatized in a glasshouse for eighteen weeks. Half of the plantlets were inoculated with ZAC-19, which is a mixed isolate containing Glomus etunicatum and an unknown Glomus spp. Plantlets were fertilized with modified Long Ashton nutrient solution containing 11 (g P/ml. Gas exchange measurements included photosynthetic rate (A), stomatal conductance (gs), internal CO2 concentration (Ci), transpiration rate (E), water use efficiency (WUE), and vapor pressure deficit (VPD). Measurements were taken at 2, 4, 8 and 18 weeks after inoculation using a LI-6200 portable photosynthesis system (LI-COR Inc. Lincoln, Neb., USA). Two weeks after inoculation, noninoculated plantlets had greater A compared to mycorrhizal plantlets. However, 4 and 8 weeks after inoculation, mycorrhizal plantlets had greater A, gs, Ci and WUE. At the end of the experiment gas exchange was comparable between noninoculated and mycorrhizal plantlets.

Gas Exchange and Water Relations of ‘Olaf’ Spring Wheat 1

Crop Science ◽  
1983 ◽  
Vol 23 (3) ◽  
pp. 541-546 ◽  
Author(s):  
Jack A. Morgan ◽  
W. O. Willis
Keyword(s):  
Gas Exchange ◽  
Water Relations ◽  
Spring Wheat

scholarly journals Comparative Study on Gas Exchange, Water Relations and Leaf Anatomy of Two Olive Cultivars Grown under Well-Irrigated and Drought Conditions

1999 ◽  
Vol 54 (9-10) ◽  
pp. 688-692 ◽  
Author(s):  
Konstantinos Chartzoulakis ◽  
Angelos Patakas ◽  
Artemis Bosabalidis
Keyword(s):  
Gas Exchange ◽  
Water Relations ◽  
Volume Fraction ◽  
Spongy Parenchyma ◽  
Intercellular Spaces ◽  
Palisade Parenchyma ◽  
Mesophyll Cells ◽  
Olive Cultivars ◽  
Olea Europea ◽  
Leaf Anatomical Characteristics

The effect of water stress on gas exchange, water relations and leaf anatomical characteristics have been studied in two olive cultivars (Olea europea, L. cv. ‘Koroneiki’ and cv. ‚Mastoidis’). Photosynthetic rate as well as stomatal conductance were decreased in stressed plants. Osmotic potential (π) declined rapidly in stressed plants indicating their ability for osmoregulation. Bulk modulus of elasticity (ε) was significantly higher in stressed compared to well irrigated plants. The volume fraction of intercellular spaces of the upper palisade parenchyma, the spongy parenchyma as well as the lower palisade parenchyma were significantly lower in stressed compared to well irrigated plants. On the other hand, the density of mesophyll cells in the upper palisade parenchyma, spongy parenchyma and lower palisade parenchyma increased significantly in stressed plants

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