Study of the reversibility of the water saturation deficit as one of the methods of causal phytogeography

1963 ◽  
Vol 5 (2) ◽  
pp. 175-180 ◽  
Author(s):  
Milena Rychnovská-Soudková
Keyword(s):  
Water Saturation ◽  
Water Saturation Deficit ◽  
Saturation Deficit

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 The effect of water saturation deficit on the volume of intercellular space in laeves

2015 ◽  
Vol 43 (4) ◽  
pp. 465-470 ◽  
Author(s):  
J. Czerski ◽  
A. Sosińska ◽  
Z. Kozłowska
Keyword(s):  
Nicotiana Tabacum ◽  
Vicia Faba ◽  
Beta Vulgaris ◽  
Plant Species ◽  
Intercellular Space ◽  
Water Saturation ◽  
Intercellular Spaces ◽  
Water Saturation Deficit ◽  
Saturation Deficit ◽  
Helichrysum Bracteatum

The volume of intercellular spaces in leaves at various stages of water saturation was determined by method of Czerski (1964, 1968). The investigation were performed with the following plant species: <i>Vicia faba</i> L., <i>Nicotiana tabacum</i> L. var. <i>rustica, Solarium tuberosum</i> L. var. Flisak, <i>Helichrysum bracteatum</i> Wild., <i>Bmssica napus</i> L. var. <i>oleifera, Beta vulgaris</i> L. var. <i>saccharifera</i>.

scholarly journals The effects of triacontanol ‘TRIA’ and Asahi SL on the development and metabolic activity of sweet basil (Ocimum basilicum L.) plants treated with chilling

2009 ◽  
Vol 21 (1) ◽  
pp. 39-48 ◽  
Author(s):  
Edward Borowski ◽  
Zbyszek K. Blamowski
Keyword(s):  
Electrolyte Leakage ◽  
Water Saturation ◽  
Foliar Application ◽  
Chilling Stress ◽  
Significant Degree ◽  
Negative Influence ◽  
Ocimum Basilicum ◽  
Water Saturation Deficit ◽  
Saturation Deficit ◽  
Chlorophyll F

Abstract In a potted experiment the influence of foliar application of triacontanol (TRIA) at the concentrations of 0.01; 0.10; 1.00 mg dm-3, and Asahi SL at the concentrations of 0.1; 0.2; 0.3% on the growth and yielding of plants was studied. Electrolyte leakage, water saturation deficit, contents of proline and chlorophyll a + b in leaves, as well as the maximum quantum efficiency of chlorophyll (Fv/Fm) and gas exchange in plants which were treated for five days in temperatures of 15/7°C (day/night) were also examined. The achieved results showed that periodic chilling decreased the value of all the analysed parameters of the plants to a significant degree, with the exception of electrolyte leakage, water saturation deficit and proline content, whose values under these conditions increased. Triacontanol and Asahi SL favourably influenced both the plants treated and not treated with periodic chilling, but the effect of biostimulators on plants treated with chilling stress was clearly higher. The negative influence of chilling on the plants of Ocimum basilicum L. was decreased by TRIA in the concentration 0.10 mg dm-3, and by Asahi SL in the concentration of 0.2 and 0.3%.

Response of peanut genotypes to mid-season moisture stress: phenological, morpho-physiological, and yield traits

2009 ◽  
Vol 60 (4) ◽  
pp. 339 ◽  
Author(s):  
Chuni Lal ◽  
K. Hariprasanna ◽  
A. L. Rathnakumar ◽  
J. B. Misra ◽  
M. Y. Samdur ◽  
...  
Keyword(s):  
Water Stress ◽  
Specific Leaf Area ◽  
Water Saturation ◽  
Early Stage ◽  
Moisture Stress ◽  
Yield Traits ◽  
Water Saturation Deficit ◽  
Saturation Deficit ◽  
Pod Yield ◽  
Wax Load

Nine peanut genotypes were evaluated in two seasons under irrigated and simulated mid-season drought conditions to investigate the influence of water stress on some phenological, morpho-physiological, and yield traits. Analysis of variance revealed significant genotypic differences for all the traits studied. Water saturation deficit and epicuticular wax load increased in response to water stress and age of the crop, while specific leaf area decreased with water stress and age of the crop. In general, correlations of water saturation deficit (WSD), epicuticular wax load (EWL), and specific leaf area (SLA) with yield traits were fairly weak. WSD in the early stage under irrigated conditions was found to be positively associated with pod yield under water stress; EWL in the early stage was negatively associated with harvest index (HI) under stress. Although significant and negative correlations of SLA were found only when it was recorded in the early stage under stress and the later stage under irrigated conditions with HI and pod yield (PY), both under irrigated conditions, the trends of its associations showed that SLA had rather weak and negative correlations with PY and HI both under irrigated and stress conditions. Genotypes that accumulated flowers sooner after initiation showed less yield reduction. The negative association between HI under stress and its reduction deems HI under moisture stress an important criterion of selection for drought tolerance in peanut.

Effect of fertilizer nitrogen on drought resistance in Coffea arabica L.

1978 ◽  
Vol 90 (3) ◽  
pp. 625-631 ◽  
Author(s):  
A. J. Tesha ◽  
D. Kumar
Keyword(s):  
Drought Resistance ◽  
Coffea Arabica ◽  
Water Saturation ◽  
Stomatal Density ◽  
Bound Water ◽  
Water Saturation Deficit ◽  
Saturation Deficit ◽  
Fertilizer Nitrogen ◽  
Coffee Beans ◽  
Coffea Arabica L

SummaryWhen coffee trees have a good supply of nitrogen they are less affected by drought. Explanation and evidence are presented. Trees treated with extra nitrogen contained more adenosine triphosphate, aqueous protein and ‘bound water’.Such N-rich trees exhibited lower transpiration rates than trees relatively poor in N when water supply was limiting. They had lower stomatal density and water saturation deficit values. Leaves maintained higher chlorophyll and turgidity. The conclusion is that nitrogen increases the drought-resisting capacity of coffee trees. This aspect was clearly reflected in yield, as nitrogen-rich trees produced more coffee beans.

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