scholarly journals The Relationship between Environmental Factors and Water Status in the Rice Plant : I. On leaf water potential, leaf water content on an areal basis and water saturation deficit in leaf blades

1978 ◽  
Vol 47 (4) ◽  
pp. 655-663 ◽  
Author(s):  
Tadashi HIRASAWA ◽  
Kuni ISHIHARA
Keyword(s):  
Environmental Factors ◽  
Water Potential ◽  
Rice Plant ◽  
Water Saturation ◽  
Water Status ◽  
Leaf Water ◽  
Leaf Water Content ◽  
Water Saturation Deficit ◽  
Saturation Deficit ◽  
The Relationship

Assessment of flag leaf water status as drought tolerance discriminating trait in durum wheat (Triticum turgidum var durum L.)

2021 ◽  
Vol 2 (1) ◽  
pp. 016-027
Author(s):  
Hadda Mebarki ◽  
Ouassila Ziane ◽  
Hadjer Merbah ◽  
Hamenna Bouzerzour
Keyword(s):  
Water Content ◽  
Water Loss ◽  
Relative Water Content ◽  
Water Saturation ◽  
Water Status ◽  
Leaf Water ◽  
Leaf Water Status ◽  
Water Saturation Deficit ◽  
Saturation Deficit ◽  
Relative Water

Drought is a prominent limiting factor that impacts negatively durum wheat grain yield. Ten durum wheat breeding lines were evaluated under rainfall conditions at the Field Crop Institute Agricultural Experimental Station of Setif, Algeria, during the 2016/2017 cropping season. The investigation aimed to study the ability of flag leaf water status to discriminate among varieties for drought tolerance trait. Significant variability was observed among the tested varieties for leaf dry, wilted and turgid weights, leaf relative water content, water saturation deficit and excised water loss, after three wilting periods of 30, 60 and 90 minutes dehydration at 40°C. The assessed breeding lines were differentially categorized as drought tolerant and drought sensitive based on either relative water content or water saturation deficit or excised leaf water loss genotypic mean values. Correlation, principal components and cluster analyses indicated an unwanted significant association between excised leaf water loss and relative water content and water saturation deficit and classified the assessed entries into three clusters (CI, C2 and C3). Cluster C1 had high relative water content, low water saturation deficit but high excised water loss, while C3 had low relative water content, low excised leaf water but high-water saturation deficit, C2 being intermediate. Crosses between distant clusters (C1 vs C3) are proposed to generate more variability of the targeted traits in progeny population and to break undesirable linkage between alleles controlling leaf water status, allowing to select efficiently drought tolerant genotypes.

scholarly journals CELL DAMAGE, WATER STATUS AND GAS EXCHANGES IN CASTOR BEAN AS AFFECTED BY CATIONIC COMPOSITION OF WATER

2019 ◽  
Vol 32 (2) ◽  
pp. 482-492
Author(s):  
GEOVANI SOARES DE LIMA ◽  
HANS RAJ GHEYI ◽  
REGINALDO GOMES NOBRE ◽  
LAURIANE ALMEIDA DOS ANJOS SOARES ◽  
JOÃO BATISTA DOS SANTOS
Keyword(s):  
Salt Stress ◽  
Irrigation Water ◽  
Castor Bean ◽  
Water Saturation ◽  
Water Status ◽  
Water Saturation Deficit ◽  
Gas Exchanges ◽  
Saturation Deficit ◽  
Cationic Composition ◽  
Bean Plants

ABSTRACT Castor bean is an oilseed crop which is able to adapt to various edaphoclimatic conditions and has considerable contents of oil in its seeds, with potential for use in the castor oil industry. In this context, this study aimed to evaluate changes in membrane damage, water status and gas exchanges in castor bean plants (cv. ‘BRS Energia’) in response to irrigation water salinity and cationic composition. Randomized blocks were used to test six cationic compositions (S1 - Control; S2 - Na+; S3 - Ca2+; S4 - Na+ + Ca2+; S5 - K+ and S6 - Na+ + Ca2+ + Mg2+), in four replicates. Plants in the control treatment were subjected to irrigation using water of low electrical conductivity (S1 - ECw = 0.6 dS m-1), whereas those in the other treatments were irrigated using 4.5 dS m-1 water prepared with different cations. Higher leaf succulence associated with lower water saturation deficit is an indication of tolerance to salt stress in castor bean plants irrigated with K+-rich water. The presence of Na+ in irrigation water caused the highest water saturation deficit in castor bean leaf blades. The lowest damage in cell membranes was observed in plants irrigated with Ca2+-rich water. The damaging effect of salt stress on castor bean gas exchanges depends on the cationic composition of water and occurred in the following order: Na+>Na++Ca2+>Ca2+> Na++Ca2++Mg2+>K+.

scholarly journals Effects of Sodium Chloride Salinity on Water Relations and Ion Accumulation in Two Mungbean Varieties Differing in Salinity Tolerance

2019 ◽  
Vol 45 (1) ◽  
pp. 45-54
Author(s):  
Mst Shahnaz Sultana ◽  
MA Halim ◽  
Feroza Hossain ◽  
M Abdul Karim ◽  
Mohammad Talim Hossain
Keyword(s):  
Salt Tolerance ◽  
Water Content ◽  
Relative Water Content ◽  
Water Saturation ◽  
Water Status ◽  
Water Saturation Deficit ◽  
Saturation Deficit ◽  
Plant Parts ◽  
Relative Water ◽  
Exudation Rate

Salt tolerance in relation to water status and plant nutrients of two mungbean varieties, BARImung 2 (salinity sensitive) and BUmung 2 (salinity tolerant) was evaluated. The seeds were grown in pots and treated with NaCl levels of 0 (control), 100 and 200 mM. Different parameters related to water relations as well as mineral nutritients were measured. The exudation rate and relative water content were decreased but water saturation deficit was increased by salinity in both the varieties. In BARImung 2 plants, the exudation rate and relative water content were lower but water saturation deficit was higher than those in BUmung 2 at both 100 and 200 mM NaCl levels. Salinity also influenced the accumulation of Na, K, Ca and Mg in leaves, stems and roots of the two said mungbean varieties. Sodium accumulation was inceseased in all the plant-parts of both the varieties in the order of stem > root > leaf but in BUmung 2 the accumulation was lower than that of BARImung 2 except in root. Potassium accumulation deceresed in all parts of both the mungbean varieties but that was lower in BUmung 2 than that of BARImung 2. The contents of Ca and Mg in all the plant-parts increased more in BUmung 2 than those of BARImung 2 with the increase of salinity levels. All these results indicated that high salt tolerance in BUmung 2 was associated with its better water status, more or less uniform mineral nutrient (Ca and Mg) distribution in different plantparts than that in BARImung 2. Asiat. Soc. Bangladesh, Sci. 45(1): 45-54, June 2019

Water Relations of the Mistletoe, Amyema miquelii, and Its Host Eucalyptus fasciculosa

1988 ◽  
Vol 36 (3) ◽  
pp. 239 ◽  
Author(s):  
J Whittington ◽  
R Sinclair
Keyword(s):  
Water Potential ◽  
Water Flow ◽  
Water Relations ◽  
Leaf Water Potential ◽  
Transpiration Rate ◽  
Water Status ◽  
Leaf Water ◽  
Tissue Water ◽  
The Relationship ◽  
Seasonal Data

Mistletoes have frequently been found to transpire more rapidly than their hosts, and usually maintain a more negative water potential. Leaf water potential and diffusive conductance were monitored from the end of a dry summer (March) through a wet winter (to August) on the mistletoe Amyema miquelii (Lehm. ex Miq.) Tieghem and its host Eucalyptus fasciculosa F. Muell. The calculated transpiration rate of the mistletoe was greater than that of its host, but water potential data showed two unusual features. Firstly, the parasite pre-dawn water potential always remained lower than that of the host, regardless of the host's water status. Secondly, the parasite water potential during the day was on one occasion less negative than that of the host, i.e. a reverse gradient. Tissue water relations studies showed that A. miquelii leaves had more negative solute potential and a larger water capacitance than E. fasciculosa leaves. The unusual features of the seasonal data were explained in terms of a large haustorial resistance to water flow and hysteresis in the relationship between transpiration and water potential in the mistletoe leaf. This hysteresis was thought to be due to the contribution of stored leaf water to transpiration.

scholarly journals Capability of leaf water content and its threshold values in reflection of soil–plant water status in maize during prolonged drought

2021 ◽  
Vol 124 ◽  
pp. 107395
Author(s):  
Huailin Zhou ◽  
Guangsheng Zhou ◽  
Qijin He ◽  
Li Zhou ◽  
Yuhe Ji ◽  
...  
Keyword(s):  
Water Content ◽  
Water Status ◽  
Leaf Water ◽  
Plant Water Status ◽  
Leaf Water Content ◽  
Plant Water ◽  
Threshold Values ◽  
Prolonged Drought
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