Molecular and physiological responses of Iranian Perennial ryegrass as affected by Trinexapac ethyl, Paclobutrazol and Abscisic acid under drought stress

2017 ◽  
Vol 111 ◽  
pp. 129-143 ◽  
Author(s):  
Mohammad Hossein Sheikh Mohammadi ◽  
Nematollah Etemadi ◽  
Mohammad Mehdi Arab ◽  
Mostafa Aalifar ◽  
Mostafa Arab ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Drought Stress ◽  
Perennial Ryegrass ◽  
Physiological Responses

scholarly journals Growth and Physiological Responses of Temperate Pasture Species to Consecutive Heat and Drought Stresses

Plants ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 227 ◽  
Author(s):  
Perera ◽  
Cullen ◽  
Eckard
Keyword(s):  
Drought Stress ◽  
Perennial Ryegrass ◽  
Tall Fescue ◽  
Physiological Responses ◽  
Recovery Period ◽  
Photochemical Efficiency ◽  
Cell Membrane Permeability ◽  
Grass Species ◽  
Pasture Production ◽  
Eastern Australia

Heat and drought are two major limiting factors for perennial pasture production in south eastern Australia. Although previous studies have focused on the effects of prolonged heat and drought stresses on pasture growth and physiology, the effects of short term recurring combined heat and drought stresses and the recovery from them have not been studied in detail. A controlled environment experiment was conducted to investigate the growth and physiological responses of perennial ryegrass (Lolium perenne L.), cocksfoot (Dactylis glomerata L.), tall fescue (Festuca arundinacea Schreb.) and chicory (Cichorium intybus L.) plants exposed to two consecutive seven day heat (control = 25/15 °C day/night; moderate = 30/20 °C day/night and severe = 35/30 °C day/night) and/or drought stresses each followed by a seven day recovery period. During the first moderate and severe heat and drought treatments, maximum photochemical efficiency of photosystem II (Fv/Fm), cell membrane permeability and relative leaf water content decreased in chicory and tall fescue compared to perennial ryegrass and cocksfoot. However, during the second moderate heat and drought treatment, all species showed less reduction in the same parameters suggesting that these species acclimated to consecutive moderate heat and drought stresses. Chicory was the only species that was not affected by the second severe heat and drought stress while physiological parameters of all grass species were reduced closer to minimum values. Irrigation mitigated the negative effects of heat stress by cooling the canopies 1–3 °C below air temperatures with the most cooling observed in chicory. All the species exposed to moderate heat and drought were fully recovered and those exposed to severe heat and drought recovered partially at the end of the experiment. These findings suggest that chicory may be a potential species for areas subject to frequent heat and drought stress.

Stress-responsive tomato gene SlGRAS4 function in drought stress and abscisic acid signaling

Plant Science ◽  
2021 ◽  
Vol 304 ◽  
pp. 110804
Author(s):  
Yudong Liu ◽  
Ling Wen ◽  
Yuan Shi ◽  
Deding Su ◽  
Wang Lu ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Drought Stress ◽  
Abscisic Acid Signaling ◽  
Tomato Gene

scholarly journals Accumulation of Silicon and Changes in Water Balance under Drought Stress in Brassica napus var. napus L.

Plants ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 280
Author(s):  
Diana Saja-Garbarz ◽  
Agnieszka Ostrowska ◽  
Katarzyna Kaczanowska ◽  
Franciszek Janowiak
Keyword(s):  
Abscisic Acid ◽  
Drought Stress ◽  
Stomatal Conductance ◽  
Water Balance ◽  
Water Content ◽  
Oilseed Rape ◽  
Potential Evapotranspiration ◽  
Leaf Water Content ◽  
Optimal Conditions ◽  
Abscisic Acid Level

The aim of this study was to investigate the accumulation of silicon in oilseed rape and to characterize the changes in chosen water balance parameters in response to drought. The following parameters were estimated: water content, osmotic and water potential, evapotranspiration, stomatal conductance and abscisic acid level under optimal and drought conditions. It was shown that oilseed rape plants accumulate silicon after its supplementation to the soil, both in the case of silicon alone and silicon together with iron. It was revealed that silicon (without iron) helps maintain constant water content under optimal conditions. While no silicon influence on osmotic regulation was observed, a transpiration decrease was detected under optimal conditions after silicon application. Under drought, a reduction in stomatal conductance was observed, but it was similar for all plants. The decrease in leaf water content under drought was accompanied by a significant increase in abscisic acid content in leaves of control plants and those treated with silicon together with iron. To sum up, under certain conditions, silicon is accumulated even in non-accumulator species, such as oilseed rape, and presumably improves water uptake under drought stress.

Foliar Application of Abscisic Acid and Sulfonamide Compounds Induced Drought Tolerance in Watermelon

2015 ◽  
Vol 723 ◽  
pp. 705-710
Author(s):  
Wei Shun Cheng ◽  
Dan Li Zeng ◽  
Na Zhang ◽  
Hong Xia Zeng ◽  
Xian Feng Shi ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Drought Stress ◽  
Drought Tolerance ◽  
Ascorbate Peroxidase ◽  
Glycine Betaine ◽  
Foliar Application ◽  
Citrullus Lanatus ◽  
Recovery Phase ◽  
Daily Application

The effects of exogenous abscisic acid and two sulfonamide compounds: Sulfacetamide and Sulfasalazine were studied on tolerance of watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai var. lanatus] under drought stress and compared with abscisic acid effects. Eight-week old plants were treated with ABA (10 and 25 mg/L), Sulfacetamide (25, 50 and 100 mg/L) and Sulfasalazine (25,50 and 100 mg/L). Solutions were sprayed daily and sampling was done at 0 h, 48 h, 96 h, 144 h and 48 h after re-watering (recovery phase or 192 h). Treated plants showed relatively greater drought tolerance. This indicates that, Sulfacetamide and Sulfasalazine may improve resistance in watermelon, like ABA, increasing levels of proline, glycine betaine and malondialdehyde and the activity of ascorbate peroxidase. Daily application of Sulfasalazine and Sulfacetamide during drought stress period was effective in increasing watermelon plants tolerance to drought as was ABA.

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