scholarly journals Response of Leaf Water Potential of Rice (Oryza sativa L.) to Evaporative Demand under Paddy Field Conditions. I. Changes with plant development.

1993 ◽  
Vol 62 (1) ◽  
pp. 9-16
Author(s):  
Tohru KOBATA ◽  
Kenji SHIONO ◽  
Toshiaki TAKEI ◽  
Atushi KATUBE ◽  
Tadashi IMAKI
Keyword(s):  
Oryza Sativa ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Plant Development ◽  
Paddy Field ◽  
Oryza Sativa L ◽  
Leaf Water ◽  
Field Conditions ◽  
Evaporative Demand

scholarly journals Response of Leaf Water Potential of Rice (Oryza sativa L.) to Evaporative Demand under Paddy Field Conditions. II. Relationship between response and yield.

1993 ◽  
Vol 62 (1) ◽  
pp. 17-26 ◽  
Author(s):  
Tohru KOBATA ◽  
Kenji SHIONO ◽  
Toshiaki TAKEI ◽  
Atushi KATUBE ◽  
Shinichiro UTAKA ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Paddy Field ◽  
Oryza Sativa L ◽  
Leaf Water ◽  
Field Conditions ◽  
Evaporative Demand

Genetics of Leaf Water Potential and its Relationship with Drought Avoidance Components in Rice (Oryza sativa L.)

2003 ◽  
Vol 3 (9) ◽  
pp. 760-765 ◽  
Author(s):  
M.K. Bashar . ◽  
Khaleda Akter . ◽  
K.M. Iftekharuddaula . ◽  
M.S. Ali .
Keyword(s):  
Oryza Sativa ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Oryza Sativa L ◽  
Leaf Water ◽  
Drought Avoidance

Genotypic consistency in the expression of leaf water potential in rice (Oryza sativa L.)

2006 ◽  
Vol 97 (2-3) ◽  
pp. 142-154 ◽  
Author(s):  
V. Sibounheuang ◽  
J. Basnayake ◽  
S. Fukai
Keyword(s):  
Oryza Sativa ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Oryza Sativa L ◽  
Leaf Water

Modelling diurnal patterns of leaf water potential in field conditions

1986 ◽  
Vol 33 (2-4) ◽  
pp. 185-203 ◽  
Author(s):  
Nader Katerji ◽  
Marc Hallaire ◽  
Yvette Menoux-Boyer ◽  
Brigitte Durand
Keyword(s):  
Water Potential ◽  
Leaf Water Potential ◽  
Leaf Water ◽  
Field Conditions ◽  
Diurnal Patterns

scholarly journals Rapid changes in root HvPIP2;2 aquaporins abundance and ABA concentration are required to enhance root hydraulic conductivity and maintain leaf water potential in response to increased evaporative demand

2018 ◽  
Vol 45 (2) ◽  
pp. 143 ◽  
Author(s):  
Dmitry S. Veselov ◽  
Guzel V. Sharipova ◽  
Stanislav Yu. Veselov ◽  
Ian C. Dodd ◽  
Igor Ivanov ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Water Potential ◽  
Air Temperature ◽  
Leaf Water Potential ◽  
Vapour Pressure Deficit ◽  
Leaf Water ◽  
Evaporative Demand ◽  
Root Hydraulic Conductivity ◽  
Rapid Changes ◽  
Aba Content

To address the involvement of abscisic acid (ABA) in regulating transpiration and root hydraulic conductivity (LpRoot) and their relative importance for maintaining leaf hydration, the ABA-deficient barley mutant Az34 and its parental wild-type (WT) genotype (cv. Steptoe) were grown in hydroponics and exposed to changes in atmospheric vapour pressure deficit (VPD) imposed by air warming. WT plants were capable of maintaining leaf water potential (ψL) that was likely due to increased LpRoot enabling higher water flow from the roots, which increased in response to air warming. The increased LpRoot and immunostaining for HvPIP2;2 aquaporins (AQPs) correlated with increased root ABA content of WT plants when exposed to increased air temperature. The failure of Az34 to maintain ψL during air warming may be due to lower LpRoot than WT plants, and an inability to respond to changes in air temperature. The correlation between root ABA content and LpRoot was further supported by increased root hydraulic conductivity in both genotypes when treated with exogenous ABA (10−5 M). Thus the ability of the root system to rapidly regulate ABA levels (and thence aquaporin abundance and hydraulic conductivity) seems important to maintain leaf hydration.

scholarly journals Optimal carbon partitioning reconciles the apparent divergence between optimal and observed canopy profiles of photosynthetic capacity

2020 ◽  
Author(s):  
Thomas N. Buckley
Keyword(s):  
Water Potential ◽  
Leaf Water Potential ◽  
Photosynthetic Capacity ◽  
Optimization Theory ◽  
Carbon Partitioning ◽  
Leaf Water ◽  
Nitrogen Partitioning ◽  
Gas Exchange Parameters ◽  
Evaporative Demand ◽  
Marginal Returns

SummaryResearch conductedPhotosynthetic capacity per unit irradiance is greater, and the marginal carbon revenue of water (∂A/∂E) is smaller, in shaded leaves than sunlit leaves, apparently contradicting optimization theory. I tested the hypothesis that these patterns arise from optimal carbon partitioning subject to biophysical constraints on leaf water potential.MethodsIn a whole plant model with two canopy modules, I adjusted carbon partitioning, nitrogen partitioning and leaf water potential to maximize carbon profit or canopy photosynthesis, and recorded how gas exchange parameters compared between shaded and sunlit modules in the optimum.Key resultsThe model predicted that photosynthetic capacity per unit irradiance should be larger, and ∂A/∂E smaller, in shaded modules compared to sunlit modules. This was attributable partly to radiation-driven differences in evaporative demand, and partly to differences in hydraulic conductance arising from the need to balance marginal returns on stem carbon investment between modules. The model verified, however, that invariance in the marginal carbon revenue of N (∂A/∂N) is in fact optimal.ConclusionThe Cowan-Farquhar optimality solution (invariance of ∂A/∂E) does not apply to spatial variation within a canopy. The resulting variation in carbon-water economy explains differences in capacity per unit irradiance, reconciling optimization theory with observations.

Leaf Water Potential of Weeds and Rice (Oryza sativa)

Weed Science ◽  
1983 ◽  
Vol 31 (3) ◽  
pp. 410-414 ◽  
Author(s):  
Rolando T. Cruz ◽  
John C. O'Toole ◽  
Keith Moody
Keyword(s):  
Oryza Sativa ◽  
Water Stress ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Leaf Length ◽  
Leaf Water ◽  
Weed Competition ◽  
Weed Species ◽  
Stress Treatment ◽  
Rice Leaf

Twenty days after rice (Oryza sativaL. ‘IR28’) emergence, water was withheld from the stress treatment for 20 days while the control was kept well-watered by furrow irrigation. In the control plots, rice leaf water potential at 0800 hours was –5.5 bars and leaf length 30 cm on the 12th day of stress. In the stress treatment, leaf water potential decreased to –8 bars and leaf length to 20 cm, when no weeds competed with rice. With maximum weed competition, rice leaf water potential decreased to –18 bars and leaf length to 15.5 cm. on the 20th day of stress, dawn (0600 h) leaf water potential of rice in the stress treatment was reduced from –8 bars when no weeds competed with rice to –19 bars when competition was maximum. The weed species had higher water potential values than the rice in both control and water-stress treatments.

Sign in / Sign up

Export Citation Format

Share Document