Clustering of selected Sri Lankan rice (Oryza sativa L.) cultivars based on plant architecture and evaluation of their association to relative water content under drought

A pot culture was carried out with Oryza sativa L. vari-Co-39, to investigate the effects of supplementary calcium chloride on plants grown at NaCl (50mM) concentration. Treatments were: (1) Control: nutrient solution alone (C); (2) nutrient solution plus 50mM sodium chloride (NaCl); (3) nutrient solution plus 10mM calcium chloride (CaCl2); (4) nutrient solution plus 15mM calcium chloride (CaCl2); (5) nutrient solution and 50 mM NaCl plus supplementary 10 mM CaCl2 (NaCl + CaCl2); and (6) 50 mM NaCl plus additional mixture of 15 mM CaCl2 in nutrient solution (NaCl + CaCl2). The plants grown under salt stress produced low dry weight and relative water content than those grown in standard nutrient solution and in CaCl2 alone. Supplemental calcium chloride added to nutrient solution containing salt significantly improved growth and relative water content. Membrane permeability increased with high NaCl application and these increases in root membrane permeability were decreased with supplementary Ca. The concentration of chloride (Cl) increases highly for all treatments. Sodium (Na) concentration in plant tissues increased in both shoots and roots at high NaCl treatment. Application of supplementary Ca lowered Na concentration. Concentrations of Ca. K and N were at deficient ranges in the plants grown at high NaCl levels and these deficiencies were corrected by supplementary Ca. The ameliorating effect of Ca on growth and physiological variables could reduce the negative effect of salinity of Oryza sativa L., plants.

Download Full-text

Phenotyping of rice in salt stress environment using high-throughput infrared imaging

Acta Botanica Croatica ◽

10.2478/botcro-2013-0027 ◽

2014 ◽

Vol 73 (1) ◽

pp. 312-321 ◽

Cited By ~ 5

Author(s):

Zamin S. Siddiqui ◽

Jung-Il Cho ◽

Sung-Han Park ◽

Taek-Ryoun Kwon ◽

Gang-Seob Lee ◽

...

Keyword(s):

Salt Stress ◽

Stomatal Conductance ◽

Water Content ◽

Relative Water Content ◽

Infrared Imaging ◽

Oryza Sativa L ◽

Photosynthetic Parameters ◽

Relative Water ◽

Stress Environment ◽

And Performance

Abstract Phenotyping of rice (Oryza sativa L. cv. Donggin) in salt stress environment using infrared imaging was conducted. Results were correlated with the most frequently used physiological parameters such as stomatal conductance, relative water content and photosynthetic parameters. It was observed that stomatal conductance (R2 = -0.618) and relative water content (R2 = -0.852) were significantly negatively correlated with average plant temperature (thermal images), while dark-adapted quantum yield (Fv/Fm, R2 = -0.325) and performance index (R2 = -0.315) were not consistent with plant temperature. Advantages of infrared thermography and utilization of this technology for the selection of stress tolerance physiotypes are discussed in detail.

Download Full-text

The Method of Plant Water Status Measurement in Sweet Potato (Ipomoea Batatas (L) Lam.)

Beccariana Botanical Research Bulletin ◽

10.30862/bbrp.v7i1.274 ◽

2010 ◽

Vol 7 (1) ◽

Author(s):

Saraswati Prabawardani

Keyword(s):

Water Content ◽

Sweet Potato ◽

Relative Water Content ◽

Water Status ◽

Plant Water Status ◽

Equilibration Time ◽

Plant Water ◽

Font Size ◽

Potato Leaf ◽

Relative Water

The measurement of plant water status such as leaf water potential (LWP) and leaf relative water content (RWC) is important part of understanding plant physiology and biomass production. Preliminary study was made to determine the optimum amount of leaf abrasion and equilibration time of sweet potato leaf inside the thermocouple psychrometer chambers. Based on the trial, the standard equilibration time curve of a Peltier thermocouple for sweet potato leaf was between 2 and 3 hours. To increase the water vapour conductance across the leaf epidermis the waxy leaf cuticle should be removed or broken by abrasion. The result showed that 4 times leaf rubbings was accepted as the most effective way to increase leaf vapour conductance of sweet potato in the psychrometer chambers. In calculating the leaf relative water content, unstressed water of sweet potato leaves require 4 hours imbibition, whereas water stressed of sweet potato leaves require 5 to 6 hours to reach the saturation time. Either leaf water potential or relative water content can be used as a parameter for plant water status in sweet potato.

Download Full-text

Palmer Amaranth (Amaranthus palmeri) Competition for Water in Cotton

Weed Science ◽

10.1614/ws-d-15-00062.1 ◽

2015 ◽

Vol 63 (4) ◽

pp. 928-935 ◽

Cited By ~ 11

Author(s):

Sarah T. Berger ◽

Jason A. Ferrell ◽

Diane L. Rowland ◽

Theodore M. Webster

Keyword(s):

Water Content ◽

Relative Water Content ◽

Yield Loss ◽

Linear Trend ◽

Palmer Amaranth ◽

Cotton Production ◽

Excess Water ◽

Relative Water ◽

Competition For Light ◽

Daily Water

Palmer amaranth is a troublesome weed in cotton production. Yield losses of 65% have been reported from season-long Palmer amaranth competition with cotton. To determine whether water is a factor in this system, experiments were conduced in 2011, 2012, and 2013 in Citra, FL, and in Tifton, GA. In 2011, infrequent rainfall lead to drought stress. The presence of Palmer amaranth resulted in decreased soil relative water content up to 1 m in depth. Cotton stomatal conductance (gs) was reduced up to 1.8 m from a Palmer amaranth plant. In 2012 and 2013 higher than average rainfall resulted in excess water throughout the growing season. In this situation, no differences were found in soil relative water content or cottongsas a function of proximity to Palmer amaranth. A positive linear trend was found in cotton photosynthesis and yield; each parameter increased as distance from Palmer amaranth increased. Even in these well-watered conditions, daily water use of Palmer amaranth was considerably higher than that of cotton, at 1.2 and 0.49 g H20 cm−2d−1, respectively. Although Palmer amaranth removed more water from the soil profile, rainfall was adequate to replenish the profile in 2 of the 3 yr of this study. However, yield loss due to Palmer amaranth was still observed despite no change ings, indicating other factors, such as competition for light or response to neighboring plants during development, are driving yield loss.

Download Full-text

Effect of saline water on relative water content, rate of photosynthesis, chlorophyll content and yield of indian mustard (Brassica junceal.)

International Journal of Bio-resource and Stress Management ◽

10.5958/j.0976-4038.5.1.006 ◽

2014 ◽

Vol 5 (1) ◽

pp. 37

Author(s):

Kripa Shanker ◽

S. K. S. Parihar ◽

S. K. Biswas ◽

Kuldeep

Keyword(s):

Water Content ◽

Chlorophyll Content ◽

Relative Water Content ◽

Saline Water ◽

Indian Mustard ◽

Relative Water ◽

Rate Of Photosynthesis

Download Full-text

Relative water content consistently predicts drought mortality risk in seedling populations with different morphology, physiology, and times to death

Plant Cell & Environment ◽

10.1111/pce.14149 ◽

2021 ◽

Author(s):

Gerard Sapes ◽

Anna Sala

Keyword(s):

Water Content ◽

Mortality Risk ◽

Relative Water Content ◽

Relative Water

Download Full-text

Influence of humates to mitigate NaCl-induced adverse effects on Ocimum basilicum L.: relative water content and photosynthetic pigments

Pakistan Journal of Botany ◽

10.30848/pjb2021-4(6) ◽

2021 ◽

Vol 53 (4) ◽

Author(s):

Juan José Reyes-Pérez ◽

Bernardo Murillo-Amador ◽

Alejandra Nieto-Garibay ◽

Luis G. Hernández-Montiel ◽

Francisco H. Ruiz-Espinoza ◽

...

Keyword(s):

Adverse Effects ◽

Water Content ◽

Photosynthetic Pigments ◽

Relative Water Content ◽

Ocimum Basilicum ◽

Relative Water

Download Full-text

Relationship between Relative Water Content, Nitrogen Pools, and Growth of Phaseolus vulgaris L. and P. acutifolius A. Gray during Water Deficit

Crop Science ◽

10.2135/cropsci1999.0011183x0039000200028x ◽

1999 ◽

Vol 39 (2) ◽

pp. 467-475 ◽

Cited By ~ 47

Author(s):

Ignacio Lazcano‐Ferrat ◽

Carol J. Lovatt

Keyword(s):

Phaseolus Vulgaris ◽

Water Content ◽

Water Deficit ◽

Relative Water Content ◽

Phaseolus Vulgaris L ◽

Nitrogen Pools ◽

Relative Water

Download Full-text

Assessment of lettuce quality during storage at low relative humidity using Global Stability Index methodology

Food Science and Technology ◽

10.1590/s0101-20612012005000043 ◽

2012 ◽

Vol 32 (2) ◽

pp. 366-373 ◽

Cited By ~ 5

Author(s):

María Roberta Ansorena ◽

María Victoria Agüero ◽

María Grabriela Goñi ◽

Sara Roura ◽

Alejandra Ponce ◽

...

Keyword(s):

Ascorbic Acid ◽

Relative Humidity ◽

Global Stability ◽

Water Content ◽

Relative Water Content ◽

Storage Time ◽

Stability Index ◽

Total Chlorophyll ◽

External Zone ◽

Relative Water

During postharvest, lettuce is usually exposed to adverse conditions (e.g. low relative humidity) that reduce the vegetable quality. In order to evaluate its shelf life, a great number of quality attributes must be analyzed, which requires careful experimental design, and it is time consuming. In this study, the modified Global Stability Index method was applied to estimate the quality of butter lettuce at low relative humidity during storage discriminating three lettuce zones (internal, middle, and external). The results indicated that the most relevant attributes were: the external zone - relative water content, water content , ascorbic acid, and total mesophilic counts; middle zone - relative water content, water content, total chlorophyll, and ascorbic acid; internal zone - relative water content, bound water, water content, and total mesophilic counts. A mathematical model that takes into account the Global Stability Index and overall visual quality for each lettuce zone was proposed. Moreover, the Weibull distribution was applied to estimate the maximum vegetable storage time which was 5, 4, and 3 days for the internal, middle, and external zone, respectively. When analyzing the effect of storage time for each lettuce zone, all the indices evaluated in the external zone of lettuce presented significant differences (p < 0.05). For both, internal and middle zones, the attributes presented significant differences (p < 0.05), except for water content and total chlorophyll.

Download Full-text

Growth and physiological response of two biomass sorghum (Sorghum bicolor (L.) Moench) genotypes bred for different environments, to contrasting levels of soil moisture

Italian Journal of Agronomy ◽

10.4081/ija.2015.673 ◽

2015 ◽

Vol 10 (4) ◽

pp. 208 ◽

Cited By ~ 2

Author(s):

Lorenzo Barbanti ◽

Ahmad Sher ◽

Giuseppe Di Girolamo ◽

Elio Cirillo ◽

Muhammad Ansar

Keyword(s):

Soil Moisture ◽

Stomatal Conductance ◽

Water Potential ◽

Water Content ◽

Aboveground Biomass ◽

Relative Water Content ◽

Physiological Response ◽

Field Capacity ◽

Biomass Sorghum ◽

Relative Water

A better understanding of plant mechanisms in response to drought is a strong premise to achieving high yields while saving unnecessary water. This is especially true in the case of biomass crops for non-food uses (energy, fibre and forage), grown with limited water supply. In this frame, we investigated growth and physiological response of two genotypes of biomass sorghum (Sorghum bicolor (L.) Moench) to contrasting levels of soil moisture in a pot experiment carried out in a greenhouse. Two water regimes (high and low water, corresponding to 70% and 30% field capacity) were applied to JS-2002 and Trudan-8 sorghum genotypes, respectively bred for dry sub-tropical and mild temperate conditions. Two harvests were carried out at 73 and 105 days after seeding. Physiological traits (transpiration, photosynthesis and stomatal conductance) were assessed in four dates during growth. Leaf water potential, its components and relative water content were determined at the two harvests. Low watering curbed plant height and aboveground biomass to a similar extent (ca. 􀀀70%) in both genotypes. JS-2002 exhibited a higher proportion of belowground to aboveground biomass, i.e., a morphology better suited to withstand drought. Despite this, JS-2002 was more affected by low water in terms of physiology: during the growing season, the average ratio in transpiration, photosynthesis and stomatal conductance between droughty and well watered plants was, respectively, 0.82, 0.80 and 0.79 in JS-2002; 1.05, 1.08 and 1.03 in Trudan-8. Hence Trudan-8 evidenced a ca. 20% advantage in the three traits. In addition, Trudan-8 could better exploit abundant moisture (70% field capacity), increasing aboveground biomass and water use efficiency. In both genotypes, drought led to very low levels of leaf water potential and relative water content, still supporting photosynthesis. Hence, both morphological and physiological characteristics of sorghum were involved in plant adaptation to drought, in accordance with previous results. Conversely, the common assumption that genotypes best performing under wet conditions are less suited to face drought was contradicted by the results of the two genotypes in our experiment. This discloses a potential to be further exploited in programmes of biomass utilization for various end uses, although further evidence at greenhouse and field level is needed to corroborate this finding.

Download Full-text