Pressure‐volume curves and drought resistance in two wheat genotypes

Rascio, Agata; Cedola, M. C.; Sorrentino, G.; Pastore, Donato; Wittmer, G.

doi:10.1111/j.1399-3054.1988.tb09202.x

Cited by 26 publications

(11 citation statements)

References 23 publications

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“…Highest root/ shoot ratio was observed in the seedlings when Cr +6 -EDDHA (10µM) was supplemented in the nutrient solutions. Fresh and dry mass though decreased with increase in chromium concentrations exhibited a modulatory role as reported elsewhere [20]. Total chlorophyll content in the seedlings treated with Cr +6 -EDTA (10µM) solution was more as compared to other treatments Fig.…”

Section: Results and Discussion Growth Parameter Studysupporting

confidence: 52%

Effect of Cr+6 and Chelating Agents on Growth, Pigment Status, Proline Content and Chromium Bioavailability in Rice Seedlings

Mohanty¹,

Hk²

2011

Int J of Biot Appl

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Abstract-Hexavalent Chromium (Cr +6 ) induced several toxicological changes in the developing rice (Oryza sativa L.) seedlings as showed from present in vitro hydroponic study. Growth parameters, physiological and biochemical alterations in rice were studied in response to the application of toxic concentration of Cr +6 with addition of chelating agents. Rice seedlings growing in nutrient solutions supplemented with Cr +6 (100µM) showed noticeable decrease in root and shoot length, fresh and dry matter; whereas addition of chelating agents like EDTA, DTPA and EDDHA with Cr +6 at 10 µM stimulates the growth. Chlorophyll and carotenoid biosynthesis was also declined with the treatment of Cr +6 (100µM), but application of Cr +6 -EDTA (10µM) amplified the pigment biosynthesis. Rice seedlings treated with Cr +6 (100µM) showed increased proline content and high Cr accumulation in root whereas treatments of Cr +6 -DTPA (10µM) enhanced the shoot Cr bioaccumulation as compared to other treatments. Supplementation of Cr +6 -EDTA (10µM) showed increased phytoextraction of Cr in roots of rice seedlings. Transportation index (Ti) of seedlings grown in Cr +6 (10µM) and Cr +6 -DTPA (10µM) was found more in comparison to others. The variations in the total accumulation rate (TAR) of Cr of different seedlings were negligible.

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Section: Results and Discussion Growth Parameter Studysupporting

confidence: 52%

Effect of Cr+6 and Chelating Agents on Growth, Pigment Status, Proline Content and Chromium Bioavailability in Rice Seedlings

Mohanty¹,

Hk²

2011

Int J of Biot Appl

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“…5). A positive relationship between cell-wall rigidity and S value has also been found by other authors (Cutler et al 1977;Düring 1986;Rascio et al 1988;Kubiske and Abrams 1991;Wan et al 1993;Fan et al 1994). The capacity to maintain an adequate amount of water in the cell at low water potential could be an adaptive characteristic in species which experience moderate water stress (e.g.…”

Section: Tablementioning

confidence: 52%

Functional groups in Quercus species derived from the analysis of pressure–volume curves

Corcuera

Camarero

Gil‐Pelegrín

2002

Trees

151

110

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Oaks that occupy Mediterranean phytoclimates share common leaf features (evergreenness, high leaf dry mass per unit area, LMA). Due to this phytoclimatic, morphological, and phenological convergence it has been suggested that they might constitute a coherent functional group. To confirm this hypothesis, some physiological parameters were determined after calculating pressure-volume curves (P-V curves) using the free-transpiration method. Seventeen Quercus species from contrasting phytoclimates were studied: six Mediterranean evergreen species (Q. agrifolia, Q. chrysolepis, Q. coccifera, Q. ilex ssp. ballota, Q. ilex ssp. ilex, and Q. suber); seven nemoral deciduous species (Q. alba, Q. laurifolia, Q. nigra, Q. petraea, Q. robur, Q. rubra and Q. velutina), and four nemoro-Mediterranean deciduous species (Q. cerris, Q. faginea, Q. frainetto, and Q. pyrenaica). Two-year-old seedlings growing under homogeneous environmental conditions (no water restrictions, uniform light, and nutrient supply) were used. The statistical analyses (correlation, mean-value comparisons, principal component analysis) of leaf features and parameters derived from the P-V curves confirmed the functional homogeneity of the three phytoclimatic groups, which were characterized by their contrasting ecophysiological response to water stress. The Mediterranean oak species developed mechanisms to avoid an excessive loss of cell water (e.g. high cell-wall rigidity). Conversely, the nemoral oaks showed the opposite. The nemoro-Mediterranean oaks perform better than nemoral oaks under water-stress conditions, but they cannot perform as well as the Mediterranean oaks on relatively dry soils.

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“…Differential enthalpy (AH) was calculated through van't Hoff analysis of adsorption isotherms at 5 and 20°C, which allowed us to determine the strength of water binding. AH Several studies have shown that in leaves of plants exposed to water stress the increase in osmotic pressure is associated with a decrease in T/D2 (8,11,16,21). Changes in water content and accumulation of osmotically active and inactive dry matter would lead to a reduction in T/D ratio (16).…”

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confidence: 99%

Bound Water in Durum Wheat under Drought Stress

Rascio

Platani²,

Fonzo³

et al. 1992

Plant Physiol.

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To study drought stress effects on bound water, adsorption isotherms and pressure-volume curves were constructed for two durum wheat (TrtFcum durum Desf.) cultivars: Capeiti 8 (drought tolerant) and Creso (drought sensitive). Plants were grown under well-watered and water-stressed conditions in a controlled environment. Differential enthalpy (AH) was calculated through van't Hoff analysis of adsorption isotherms at 5 and 20°C, which allowed us to determine the strength of water binding. AH Several studies have shown that in leaves of plants exposed to water stress the increase in osmotic pressure is associated with a decrease in T/D2 (8,11,16,21). Changes in water content and accumulation of osmotically active and inactive dry matter would lead to a reduction in T/D ratio (16). In durum wheat, the variations in the ratio were accompanied by accumulation offibrous constituents such as hemicellulose (12). This substance is present as a polymeric gel and has important properties such as ion binding and water-holding capacity. The accumulation of cell wall material may affect the distribution of apoplastic (BW) and symplastic water and may be responsible for some decrease in the osmotic potential values (17).Among the large number of methods used to determine BW, the PV curve analysis is the most widely accepted. The disadvantages ofthis technique have been pointed out (7,15) Studies of the thermodynamics of hydration, through the use of water adsorption isotherms on proteins and vegetal tissues, have shown at least three types of BW. According to the strength and nature of water-binding sites, water may be very tightly, weakly, and very weakly bound to the polymer surfaces (3).Construction of water adsorption isotherms allows one to determine the strength of water binding and the leaf moisture contents corresponding to the different levels of water affinity (18).In this work, the water adsorption isotherms and the water relations were analyzed in well-watered and water-stressed durum wheat plants, comparing leaf tissues of intolerant (Creso) and tolerant (Capeiti 8) cultivars to water stress (5). Moreover, the BW values obtained from PV curve analysis and the levels of leaf tissue water affinity were compared. MATERIALS AND METHODS Plant MaterialsTwo durum wheat (Triticum durum Desf.) cultivars, Creso and Capeiti 8, were grown in a growth chamber under 250-W high-pressure sodium lamps (Philips) and 400-W highpressure metal halide lamps (Philips); radiation measurements at the pot surface were 1000 ,mol photons m-2 s-' (400-700 nm) PAR. After vernalization at 4°C for 1 week, six seeds per pot were sown in 2.25-L plastic pots that contained 1000 g of medium-textured soil, 333 g of sand, and 100 g of peat. When the seeds were sown, 20 g of ammonium nitrate fertilizer was applied to each pot, and at tillering a mix of mineral superphosphate (1.2 g/pot), ammonium nitrate (2.0 g/pot), and potassium sulfate (0.1 g/pot) was applied.The maximum water capacity of the soil was 57% of soil dry weight, and the permane...

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Pressure‐volume curves and drought resistance in two wheat genotypes

Cited by 26 publications

References 23 publications

Effect of Cr+6 and Chelating Agents on Growth, Pigment Status, Proline Content and Chromium Bioavailability in Rice Seedlings

Effect of Cr+6 and Chelating Agents on Growth, Pigment Status, Proline Content and Chromium Bioavailability in Rice Seedlings

Functional groups in Quercus species derived from the analysis of pressure–volume curves

Bound Water in Durum Wheat under Drought Stress

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