scholarly journals Dominant factors in reduction of photosynthetic rate affected by air humidity and leaf water potential in rice plants.

1989 ◽  
Vol 58 (3) ◽  
pp. 383-389 ◽  
Author(s):  
Tadashi HIRASAWA ◽  
Yukihiko IIDA ◽  
Kuni ISHIHARA
Keyword(s):  
Water Potential ◽  
Leaf Water Potential ◽  
Photosynthetic Rate ◽  
Leaf Water ◽  
Air Humidity ◽  
Rice Plants

scholarly journals Response of a clingstone peach cultivar to regulated deficit irrigation

2010 ◽  
Vol 67 (2) ◽  
pp. 164-169 ◽  
Author(s):  
Thomas Sotiropoulos ◽  
Dimitrios Kalfountzos ◽  
Ioannis Aleksiou ◽  
Spyros Kotsopoulos ◽  
Nikolaos Koutinas
Keyword(s):  
Water Potential ◽  
Leaf Water Potential ◽  
Photosynthetic Rate ◽  
Deficit Irrigation ◽  
Prunus Persica ◽  
Fruit Growth ◽  
Leaf Water ◽  
Stage Ii ◽  
Soluble Solids ◽  
Regulated Deficit Irrigation

Regulated deficit irrigation (RDI) involves inducing water stress during specific fruit growth phases by irrigating at less than full evapotranspiration. The objectives of this research were to study the effects of RDI perfomed at stage II of fruit growth and postharvest, on productivity of clingstone peaches, fruit quality as well as photosynthetic rate and midday leaf water potential. The research was conducted in a commercial clingstone peach (Prunus persica L. Batch cv. A-37) orchard in Greece. Trees were irrigated by means of microsprinklers and their frequency was determined using local meteorological station data and the FAO 56 Pennman-Monteith method. Photosynthetic rate was measured by a portable infrared gas analyzer. Midday leaf water potential was measured by the pressure chamber technique. During the years 2005 and 2006, the treatment RDII with irrigation applied at growth stage II of the peach tree did not affect productivity, fresh and dry mass of fruits. RDII reduced preharvest fruit drop in comparison to the control. RDII as well as the combined treatment RDII plus RDIP with irrigation applied at postharvest, at both years reduced shoot length of the vigorous shoots inside the canopy. RDII in comparison to the control increased the soluble solids content of the fruits and the ratio soluble solids/acidity. However it did not affect fruit acidity and fruit firmness. RDII as well as RDII plus RDIP in 2006 increased 'double' fruits and fruits with open cavity in comparison to the control and RDIP. Water savings were considerable and associated with the climatic conditions of each year.

scholarly journals Characteristics of Leaf Water Potential and Photosynthetic Rate of Blueberry Plants Grown Under Drought Stress

2011 ◽  
Vol 10 (4) ◽  
pp. 485-490 ◽  
Author(s):  
Naomi Horiuchi ◽  
Naoko Kameari ◽  
Jingai Che ◽  
Sakae Suzuki ◽  
Tadashi Hirasawa ◽  
...  
Keyword(s):  
Drought Stress ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Photosynthetic Rate ◽  
Leaf Water

scholarly journals Growth and Physiological Responses of Three Landscape Plants to Calcium Chloride

2021 ◽  
Vol 13 (10) ◽  
pp. 5429
Author(s):  
Kei-Jung Kwon ◽  
Jaehyuck Choi ◽  
Sang-Yong Kim ◽  
Na-Ra Jeong ◽  
Bong-Ju Park
Keyword(s):  
Water Potential ◽  
Calcium Chloride ◽  
Leaf Water Potential ◽  
Photosynthetic Rate ◽  
Physiological Responses ◽  
Ground Cover ◽  
Leaf Water ◽  
Control Group ◽  
Iris Ensata ◽  
Significant Difference

The objective of this study was to analyze the effects of calcium chloride (CaCl2) used as a de-icing agent on growth and physiological responses of three ground cover plants, Hosta longipes, Iris ensata, and Iris pseudoacorus. CaCl2 concentration was set to be 0 mM (control), 9 mM (0.1%), 18 mM (0.2%), and 54 mM (0.6%). After treatment with CaCl2 for 3 months, plant heights, fresh weights of shoots and roots, photosynthetic rates, chlorophyll fluorescence, chlorophyll content (SPAD), and leaf water potential were measured. After Hosta longipes was treated with CaCl2 for 60 days, physiological damage began to occur in all treatment groups except for the control group. Those treated with 54 mM CaCl2 completely withered. At 90 days after treatment (DAT), there were significant differences for all measured parameters for Hosta longipes compared to the control (p < 0.001). The higher the treatment concentration, the lower the photosynthetic rate, the SPAD, and the leaf water potential. There was no significant difference in plant height in Iris ensata after 60 DAT (p > 0.05), but in other physiological responses, there was a significant difference by concentration (p < 0.001). Iris ensata had a visually healthier state at 90 DAT, showing the smallest reduction in photosynthetic rate at 60 DAT and 90 DAT. Its SPAD value was increased more at 90 DAT than at 60 DAT, indicating its higher resistance to CaCl2. Iris pseudoacorus showed similar results as Iris ensata. Over time, the 54 mM treatment resulted in significant damage. Among these three plants, Iris ensata showed the highest tolerance to CaCl2. Therefore, they are considered to be highly beneficial ground cover plants for green infrastructure in urban areas with high CaCl2 concentrations.

scholarly journals PHYSIOLOGICAL RESPONSES OF COWPEA UNDER WATER STRESS AND REWATERING IN NO-TILLAGE AND CONVENTIONAL TILLAGE SYSTEMS

2017 ◽  
Vol 30 (3) ◽  
pp. 559-567 ◽  
Author(s):  
RÔMULO MAGNO OLIVEIRA DE FREITAS ◽  
JEFERSON LUIZ DALLABONA DOMBROSKI ◽  
FRANCISCO CLÁUDIO LOPES DE FREITAS ◽  
NARJARA WALESSA NOGUEIRA ◽  
JOSÉ RIVANILDO DE SOUZA PINTO
Keyword(s):  
Water Stress ◽  
Water Potential ◽  
Leaf Area ◽  
Leaf Water Potential ◽  
Photosynthetic Rate ◽  
Physiological Responses ◽  
Stomatal Closure ◽  
Leaf Water ◽  
No Tillage ◽  
Tillage Systems

ABSTRACT The goal of this work was to evaluate the physiological responses of cowpea under water stress and rehydration in conventional and no-tillage systems. We evaluated two crop systems (conventional and no tillage) and three water conditions (no stress, moderate stress and severe stress). The following were determined: leaf area, total dry matter, photosynthetic rate, stomatal conductance, transpiration rate, internal CO2 concentration and leaf water potential. Water stress affected all variables evaluated, with the exception of leaf water potential. Cowpea recovered with respect to all variables after rehydration at both stress levels. Stomatal closure is an important drought tolerance mechanism, and cowpea can be considered a conservative species (i.e., one that prioritizes water status maintenance rather than photosynthetic rate). Planting systems did not affect photosynthetic rate. The tillage system promoted greater accumulation of biomass and higher leaf area.

Analysis of Photosynthesis Depression under Low Leaf Water Potential by Comparison of CO2 Exchange and O2 Evolution Rates.

1996 ◽  
Vol 65 (4) ◽  
pp. 590-598 ◽  
Author(s):  
Katsuhiro WAKABAYASHI ◽  
Tadashi HIRASAWA ◽  
Kuni ISHIHARA
Keyword(s):  
Water Potential ◽  
Leaf Water Potential ◽  
Co2 Exchange ◽  
Leaf Water ◽  
O2 Evolution

Use of a Hydraulic Press for Estimation of Leaf Water Potential in Grain Sorghum 1

1986 ◽  
Vol 78 (4) ◽  
pp. 749-751 ◽  
Author(s):  
S. K. Hicks ◽  
R. J. Lascano ◽  
C. W. Wendt ◽  
A. B. Onken
Keyword(s):  
Water Potential ◽  
Leaf Water Potential ◽  
Grain Sorghum ◽  
Hydraulic Press ◽  
Leaf Water
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