Regulated irrigation of woody ornamentals to improve plant quality and precondition against drought stress

Experiments were conducted to evaluate potential means for reducing moisture stress in nine herbaceous and woody ornamental species. In Expt. 1 (2009), a water only control treatment and the antitranspirant Stasis™ at two different rates were applied as a drench application before inducing drought stress in the greenhouse by withholding water for two weeks. No significant differences in visual ratings in relation to plant quality were detected among treatments 5 days after application for any species. At 10 days after treatment, visual ratings were better for Veronica at the lower Stasis™ rate, Hibiscus at the low and higher Stasis™ rate, and Weigela at lower and higher Stasis™ rate compared to no Stasis™. At 15 days after treatment, visual ratings were worse for Coreopsis, Rudbeckia, and Salvia at both low and high Stasis™ rates; but, were better for Hibiscus and Weigela at the lower and higher Stasis™ rates compared to the no Stasis™ treatment. In Expt. 2 (2010), the antitranspirants Stasis™ and Root-Zone were evaluated along with a no antitranspirant and well-watered control treatments at single rates. No significant differences in visual ratings existed among treatments five days after application for any species. At 10 days after treatment, visual ratings were higher for Coreopsis, Forsythia, Nandina, and Weigela with Stasis™ or Root-Zone compared to no antitranspirant application. Visual ratings for Rudbeckia and Salvia with Stasis™, and Euonymus with Root-Zone were also better than the stress treatment at 10 days after treatment. At 15 days after treatment, visual ratings were higher for Coreopsis and Salvia with Stasis™ compared to the stress treatment. Rudbeckia, Euonymus, and Weigela with Stasis™ or Root-Zone and Nandina with Root-Zone all had better visual ratings than the stress treatment. Evapotranspiration was not reduced for any Stasis™ or Root-Zone treatment for any species in either experiment compared to control stress treatments.

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Elongation of Hibiscus acetosella Under Well-watered and Drought-stressed Conditions

HortScience ◽

10.21273/hortsci11039-16 ◽

2016 ◽

Vol 51 (11) ◽

pp. 1384-1388 ◽

Cited By ~ 3

Author(s):

Amanda Bayer ◽

John Ruter ◽

Marc W. van Iersel

Keyword(s):

Drought Stress ◽

Average Length ◽

Stem Elongation ◽

Ornamental Plants ◽

Leaf Size ◽

Dry Weight ◽

Time Lapse ◽

Plant Quality ◽

Shoot Dry Weight ◽

Diurnal Patterns

Controlling the elongation of ornamental plants is commonly needed for shipping and aesthetic purposes. Drought stress can be used to limit elongation, and is an environmentally friendly alternative to plant growth regulators (PGRs). However, growers can be reluctant to expose plants to drought stress because they do not want to negatively affect overall plant quality and marketability. Knowing how and when stem elongation is affected by water availability will help to increase our understanding of how elongation can be controlled without reducing plant quality. Rooted Hibiscus acetosella Welw. ex Hiern. cuttings were grown in a growth chamber set to a 12-hour photoperiod at 25 °C. Two plants of similar size were used for each replication of the study to compare growth under well-watered and drought-stressed conditions. Time lapse photography was used to determine the diurnal patterns of elongation over the course of the replications. Evapotranspiration was measured using load cells. Well-watered and drought-stressed plants had similar diurnal patterns of elongation and evapotranspiration, demonstrating that both follow circadian rhythms and are not just responding to environmental conditions. Stem elongation was greatest at night and coincided with evapotranspiration decreases, with greatest elongation shortly after the onset of darkness. Elongation was minimal between 800 and 1000 hr when evapotranspiration increases. During the drought-stress portion of the replications, elongation of drought-stressed plants was 44% less than well-watered plants. Final plant height and shoot dry weight for the drought-stressed plants were 21% and 30% less than well-watered plants, respectively. Total leaf area, number of leaves, and number of new visible internodes were greater for well-watered plants than drought-stressed plants. Average length of visible internodes and leaf size were similar for drought-stressed and well-watered plants. If growers want to use drought stress for elongation control, they should ensure that plants are drought stressed before the onset of and during the dark period, when most elongation occurs.

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Flavonoid profiling by LC-MS IN 14 – 3-3ν knockout mutants of Arabidopsis thaliana during drought stress conditions

Planta Medica ◽

10.1055/s-0034-1382678 ◽

2014 ◽

Vol 80 (10) ◽

Cited By ~ 1

Author(s):

F Nabbie ◽

O Shperdheja ◽

J Millot ◽

J Lindberg ◽

B Peethambaran

Keyword(s):

Arabidopsis Thaliana ◽

Drought Stress ◽

Stress Conditions ◽

Knockout Mutants

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Mitigation Effects of 24-Epibrassinolide and Thiourea in Field Pea (Pisum sativum L.) under Drought Stress

THE JOURNAL OF PLANT SCIENCE RESEARCH ◽

10.32381/jpsr.2018.34.02.11 ◽

2018 ◽

Vol 34 (2) ◽

pp. 229-235 ◽

Cited By ~ 1

Author(s):

Prachi Garg ◽

◽

A. Hemantaranjan ◽

Jyostnarani Pradhan ◽

◽

...

Keyword(s):

Drought Stress ◽

Pisum Sativum ◽

Field Pea ◽

Pisum Sativum L

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Water balance, drought stress and yields for rainfed field crop rotations under present and future conditions in the Czech Republic

Climate Research ◽

10.3354/cr01339 ◽

2015 ◽

Vol 65 ◽

pp. 175-192 ◽

Cited By ~ 8

Author(s):

P Hlavinka ◽

KC Kersebaum ◽

M Dubrovský ◽

M Fischer ◽

E Pohanková ◽

...

Keyword(s):

Czech Republic ◽

Drought Stress ◽

Water Balance ◽

Crop Rotations ◽

Field Crop ◽

The Czech Republic

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EVALUATION OF CLOVERS ON SANDY COASTAL SOIL

Proceedings of the New Zealand Grassland Association ◽

10.33584/jnzg.1977.39.1500 ◽

1977 ◽

pp. 130-138 ◽

Cited By ~ 1

Author(s):

W.M. Williams ◽

L.B. Anderson ◽

B.M. Cooper

Keyword(s):

New Zealand ◽

Drought Stress ◽

Sandy Soil ◽

White Clover ◽

Plant Material ◽

Red Clover ◽

Early Spring ◽

Commercial Cultivars ◽

Mediterranean Origin ◽

Winter Annual

In evaluations of clover performances on summer-dry Himatangi sandy soil, it was found that none could match lucerne over summer. Emphasis was therefore placed on production in autumn-winter- early spring when lucerne growth was slow. Evaluations of some winter annual clover species suggested that Trifolium spumosum, T. pallidum, T. resupinatum, and T. vesiculosum would justify further investigation, along with T. subterraneum which is already used in pastures on this soil type. Among the perennial clover species, Kenya white clover (7'. semipilosum) showed outstanding recovery from drought and was the only species to produce significantly in autumn. However, it failed to grow in winter-early spring. Within red clover, materials of New Zealand x Moroccan origin substantially outproduced the commercial cultivars. Within white clover, material from Israel, Italy and Lebanon, as well as progeny of a selected New Zealand plant, showed more rapid recovery from drought stress and subsequently better winter growth than New Zealand commercial material ('Grasslands Huia'). The wider use of plant material of Mediterranean origin and of plants collected in New Zealand dryland pastures is advocated in development of clover cultivars for New Zealand dryland situations.

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DYNAMIC OF PROLINE, PIGMENT CONTENTS, WATER FRACTIONS IN APPLE (Malus domestica Borkh.) FOLIAGE UNDER TEMPERATURE DROUGHT STRESS AND PROTECTION MEASURES

Sel skokhozyaistvennaya Biologiya ◽

10.15389/agrobiology.2018.3.598eng ◽

2018 ◽

Vol 53 (3) ◽

pp. 598-604

Author(s):

N.I. Nenko ◽

◽

N.N. Sergeeva ◽

G.K. Kiseleva ◽

Yu.I. Sergeev ◽

...

Keyword(s):

Drought Stress ◽

Malus Domestica ◽

Protection Measures ◽

Malus Domestica Borkh ◽

Pigment Contents ◽

Water Fractions

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A lipid-mediated cross-talk between insect defense and drought stress responses

10.1603/ice.2016.94316 ◽

2016 ◽

Author(s):

MIchael Kolomiets

Keyword(s):

Drought Stress ◽

Cross Talk ◽

Stress Responses ◽

Insect Defense

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Drought stress and osmo-priming effects on physiological and biochemical characteristics of Ocimum basilicum

JOURNAL OF ADVANCES IN AGRICULTURE ◽

10.24297/jaa.v6i1.5397 ◽

2016 ◽

Vol 6 (1) ◽

pp. 905-913

Author(s):

Bahram Majd Nassiry ◽

Neda Mohammadi

Keyword(s):

Drought Stress ◽

Total Protein ◽

Catalase Activity ◽

Seedling Emergence ◽

Seed Priming ◽

Ocimum Basilicum ◽

Field Development ◽

Physiological And Biochemical Characteristics ◽

Germination Characteristics ◽

And Control

Â Â Â One of the effects of reducing water content on soil is reduction of growth and development of seedlings and variation of field development. Seed priming technique has been known as a challenge to improve germination and seedling emergence under different environmental stresses. The objectives of this research were to evaluate the effects of osmo-priming on germination characteristics and changes of proline, protein and catalase activity of Ocimum basilicum seeds. Results showed that drought stress reduced the germination characteristics and drought stress in -8 bar was the critical stress.Â Priming treatments were include KNO3, PEG and NaCl by 0, -4 and -8 bar concentrations. The seeds were primed with those materials for 8 and 16 hours. The highest germination characteristics were obtained from nitrate potassium in -8 bar for 16 hours priming. Therefore the best seed treatment under drought stress during germination was obtained from the osmo-primed with -8 bar nitrate potassium for 16 hours. The drought stress increased proline and catalase activity but reduced total protein. Priming treatment increases proline, total protein and catalase activity under drought and control conditions. It is concluded that priming results in improvement in germination components of Ocimum basilicum in drought stress conditions and increases the resistance to drought stress with improvement of proline, protein and catalase activity in germination phase.

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