Correlation between water stress and phenolic compounds of hydroSOStainable almonds

Of all the abiotic stress types to which plants grown in fields are exposed, the most influential is water stress. It is well accepted that adopting controlled deficit irrigation strategies during the growing season has beneficial effects on the chemical compositions of grapes and red wines. However, there is a discrepancy in the timing, intensity and duration of deficit. This study aimed to evaluate the changes in phenolic composition of ‘merlot’ cultivar grapes when subjected to different levels of water stress in a semi-arid Mediterranean climate. Four treatments with different water stress levels were applied within two phenological intervals (flowering-veraison, veraison-maturity) to 128 grapevines for two consecutive years. The water stress levels for Treatments 1, 2, 3 and 4 were: no-light, light-moderate, moderate-intense and intense for the flowering-veraison and veraison-maturity intervals, respectively. Water stress distinctly affected the phenolic compounds in skin and seeds. The concentrations of flavan-3-ols and total polyphenols were much higher in seeds than in skin, and in both fractions, tannins are the major compounds.

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Photochemical Study and Biological Activity of Phenolic Compounds of four Varieties of common Wheat (Triticum Aestivum) and Barley (Hordeum vulgar) subjected to Water Stress

May 17-18, 2017 Istanbul (Turkey) ◽

10.15242/dirpub.dir0517253 ◽

2017 ◽

Keyword(s):

Triticum Aestivum ◽

Biological Activity ◽

Water Stress ◽

Phenolic Compounds ◽

Common Wheat

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Water stress and abscisic acid exogenous supply produce differential enhancements in the concentration of selected phenolic compounds in Cabernet Sauvignon

Journal of Berry Research ◽

10.3233/jbr-2011-026 ◽

2012 ◽

Vol 2 (1) ◽

pp. 33-44 ◽

Cited By ~ 4

Author(s):

Andrea Mariela Quiroga ◽

Leonor Deis ◽

Juan Bruno Cavagnaro ◽

Rubén Bottini ◽

María Fernanda Silva

Keyword(s):

Abscisic Acid ◽

Water Stress ◽

Phenolic Compounds ◽

Cabernet Sauvignon ◽

Exogenous Supply

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The Effect of Irrigation Frequency, Phosphorus Fertigation, and Cultivar on Levels of Phenolic Compounds in Sweet Cherries

HortScience ◽

10.21273/hortsci13303-18 ◽

2018 ◽

Vol 53 (10) ◽

pp. 1507-1512

Author(s):

Kelly Ross ◽

Gerry Neilsen ◽

Denise Neilsen

Keyword(s):

Water Stress ◽

Phenolic Compounds ◽

Fruit Size ◽

Irrigation Frequency ◽

Growing Seasons ◽

Severe Water Stress ◽

Sweet Cherries ◽

Irrigation Treatments ◽

Sweet Cherry Cultivars ◽

Wood Mulch

This work examined the effect of irrigation frequency and phosphorus (P) fertigation on the levels of phenolic compounds present in two sweet cherry cultivars, ‘Skeena’ and ‘Cristalina’, over three growing seasons (2012–14). Two irrigation treatments were tested: a high irrigation frequency (I1) and a low irrigation frequency (I2). Both irrigation treatments applied the same quantities of water [100% evapotranspiration (ET)], but the high irrigation frequency applied water four times daily (0300, 0900, 1500, and 2100 hr) whereas the low irrigation frequency was applied at one time (0900 hr) every second day. Three soil management treatments were investigated, including 1) an unmulched control receiving no P, 2) a 10-cm waste wood mulch receiving no P, and 3) a treatment involving annual fertigation of 20 g P/tree at full bloom as ammonium polyphosphate. It was determined that cultivar was the most important factor affecting levels of phenolic compounds in sweet cherries, with generally greater levels associated with ‘Skeena’. The effect of different irrigation and fertilization strategies showed less promising results in terms of influencing levels of phenolic compounds. Both severe and mild water stress did not show an appreciable influence on increasing levels of phenolic compounds in cherries. Furthermore, severe water stress, which occurred during 2012, was associated with the lowest annual concentration of phenolic compounds and an economically unacceptable reduction in fruit size. Phosphorus fertigation influenced cherry phosphorus status positively by increasing leaf and fruit P concentrations consistently, yet these fruit exhibited lower levels of phenolic compounds.

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Monoterpene and Phenolic Compound Concentrations in Water-Stressed Red Pine Inoculated with Sphaeropsis sapinea

Phytopathology ◽

10.1094/phyto.1998.88.3.245 ◽

1998 ◽

Vol 88 (3) ◽

pp. 245-251 ◽

Cited By ~ 16

Author(s):

J. T. Blodgett ◽

G. R. Stanosz

Keyword(s):

Water Stress ◽

Phenolic Compounds ◽

Field Experiment ◽

Red Pine ◽

Growth Chamber ◽

Tissue Extracts ◽

Pine Trees ◽

Sphaeropsis Sapinea ◽

Individual Trees

Changes in monoterpene and phenolic compounds resulting from water stress and colonization by Sphaeropsis sapinea were examined for 9- and 11-year-old red pine trees in a plantation and 3-year-old seedlings in a growth chamber. Four treatments were assigned at random to individual trees in the field: no treatment, herbicide to kill surrounding weeds, supplemental water, and both herbicide and supplemental water. In the growth chamber, seedlings were either not watered (water stressed) or watered daily (nonstressed). Shoots were inoculated with agar plugs colonized with either S. sapinea isolates of morphotype A and B (field) or only isolates of morphotype A (growth chamber). Nine monoterpenes were detected in tissue extracts; the most common were α-pinene (59 to 74% of the total), β-pinene (13 to 33% of the total), and δ-3-carene (1 to 5% of the total). Shoots inoculated with isolates of morphotype A had more severe symptoms and produced higher concentrations of monoterpenes in both experiments compared with the controls. In the growth chamber, inoculations with isolates of morphotype A caused higher concentrations of phenolics compared with the controls. In the field experiment, monoterpenes increased in quantity only in shoots of stressed trees inoculated with isolates of morphotype A. Isolates of morphotype B caused few symptoms and did not alter monoterpene concentrations. Increases in monoterpenes do not appear to be involved in the response to infection by morphotype A in nonstressed trees, and the role of phenolics is unclear. However, these results are consistent with previous observations that monoterpenes may be involved in the differences in aggressiveness between morphotypes on red pine.

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