Background:

Protective role of salicylic acid against drought has been widely reported, but its effects on Zinnia elegans remain unknown.

Hypotheses:

Foliar salicylic acid (SA) improves water status, pigments, and antioxidant systems of Zinnia plants under drought stress.

Studied species:

Z. elegans (cv. Dreamland) were purchased from Chanan Seeds Store Lahore, Pakistan.

Study site and dates:

MNS University of Agriculture, Multan, Punjab, Pakistan; March-May, 2018.

Methods:

After two weeks of transplanting, one set of seedlings was exposed to drought stress (60 % field capacity, FC) while other control set was maintained at 100 % FC. Foliar SA (100 mg L-1) was applied to plants at drought initiation.

Results:

Foliar SA treatment to water stressed plants (60 % FC) increased the leaf area (46.89 cm2), shoot and root lengths (25 cm and 26.67 cm, respectively), leaf relative water content (75.98 %); chlorophyll a (0.68 mg g-1), chlorophyll b (0.38 mg g-1) and carotenoid concentrations (1.10 mg g-1); and catalase (116.67 U min-1 mg-1 protein), guaiacol peroxide (72 U min-1 mg-1 protein) and superoxide dismutase (93 U min-1 mg-1 protein) activities.

Conclusions:

Foliar SA could be used to minimize impacts of water stress in Zinnia plants.

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