scholarly journals Effects of Three Irrigation Strategies on Gas Exchange Relationships, Plant Water Status, Yield Components and Water Productivity on Grafted Carménère Grapevines

2018 ◽  
Vol 9 ◽  
Author(s):  
Mauricio Zúñiga ◽  
Samuel Ortega-Farías ◽  
Sigfredo Fuentes ◽  
Camilo Riveros-Burgos ◽  
Carlos Poblete-Echeverría
Keyword(s):  
Gas Exchange ◽  
Yield Components ◽  
Water Status ◽  
Water Productivity ◽  
Plant Water Status ◽  
Plant Water ◽  
Exchange Relationships

Relationship of plant water status and leaf gas exchange with fruit cracking of pomegranate

2019 ◽  
Vol 76 (2) ◽  
pp. 289
Author(s):  
Akath Singh ◽  
U. Burman ◽  
P. Santra ◽  
Anurag Saxena ◽  
P.R. Meghwal
Keyword(s):  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Plant Water Status ◽  
Plant Water ◽  
Fruit Cracking ◽  
Relationship Of

scholarly journals An Index for User-Friendly Proximal Detection of Water Requirements to Optimized Irrigation Management in Vineyards

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 323
Author(s):  
Ana Fernandes de Oliveira ◽  
Massimiliano Giuseppe Mameli ◽  
Mauro Lo Cascio ◽  
Costantino Sirca ◽  
Daniela Satta
Keyword(s):  
Water Potential ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Water Productivity ◽  
Linear Regression Analysis ◽  
Plant Water Status ◽  
Plant Water ◽  
Stem Water Potential ◽  
Water Requirements ◽  
Stem Water

We propose an index for proximal detection of water requirements to optimize the use of water resources in arid and semi-arid wine growing regions. To test the accuracy and representativeness of the proposed irrigation need index (IIN), plant water status and physiological performances were monitored during seasons 2019 and 2020 in two grapevine varieties with different anisohydric degree (Vermentino and Cannonau) grown in 3 sites in Sardinia (Italy). Daily leaf gas exchange curves and stem water potential were recorded. Canopy temperature was monitored, using both thermistor sensors (Tc) and infrared thermometry (IR). Meteorological data, including dry and wet bulb temperatures were collected to compute and parametrize IIN, based on energy balance equation. Vineyard water balance, thermal time and irrigation water productivity were characterized. Linear regression analysis allowed to validate IIN for both varieties and to establish target thresholds for mild, moderate and severe water deficit to optimize irrigation for high yield and quality objectives. IIN well represents plant water status, using either Tc or IR, and allows rapid and easy detection of water and heat stress condition, even when a stricter stomatal control determines slighter variation and lower response of stem water potential, as in plants with low anisohydric degree.

scholarly journals Leaf Water Relations in Lime Trees Grown under Shade Netting and Open-Air

Plants ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 510 ◽  
Author(s):  
Ana Belén Mira-García ◽  
Wenceslao Conejero ◽  
Juan Vera ◽  
María Carmen Ruiz-Sánchez
Keyword(s):  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Water Status ◽  
Canopy Temperature ◽  
Net Photosynthesis ◽  
Irrigation Scheduling ◽  
Plant Water Status ◽  
Plant Water ◽  
Stem Water Potential ◽  
Thermal Index

Physiological plant water status indicators are useful for managing precision irrigation in regions with limited water resources. The aim of this work was to evaluate the effect of shade netting on the diurnal and seasonal variations of several plant water status indicators in young lime trees (Citrus latifolia Tan., cv. Bearss), grown at the CEBAS-CSIC experimental station in Murcia, Spain. Stem water potential (Ψstem), leaf gas exchange (net photosynthesis (Pn) and stomatal conductance (gs)), and canopy temperature (Tc) were measured on representative days of winter and summer. The Ψstem daily pattern was quite similar in both seasons under both conditions. However, the circadian rhythm of leaf gas exchange was affected by shade conditions, especially in summer, when shaded leaves showed maximum gs values for a longer time, allowing higher net photosynthesis (37%). Canopy temperature behaved similarly in both conditions, nevertheless, lower values were recorded in open-air than in shaded trees in the two seasons. The canopy-to-air temperature difference (Tc − Ta), however, was lower in shaded trees during the daylight hours, indicating the higher degree of leaf cooling that was facilitated by high gs values. The possibility of continuously recording Tc makes it (or the proposed canopy thermal index, CTI) a promising index for precise irrigation scheduling. Shade netting was seen to favour gas exchange, suggesting that it may be considered alternative to open-air for use in semi-arid areas threatened by climate change.

scholarly journals Stomatal kinetics and photosynthetic gas exchange along a continuum of isohydric to anisohydric regulation of plant water status

2017 ◽  
Vol 40 (8) ◽  
pp. 1618-1628 ◽  
Author(s):  
Frederick C. Meinzer ◽  
Duncan D. Smith ◽  
David R. Woodruff ◽  
Danielle E. Marias ◽  
Katherine A. McCulloh ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Water Status ◽  
Plant Water Status ◽  
Plant Water ◽  
Photosynthetic Gas Exchange
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