Smoke‐water and karrikinolide (KAR₁) foliar applications promote seedling growth and photosynthetic pigments of the biofuel seed crop Jatropha curcas L
2013
Abdelgadir, Hafiz A. | Kulkarni, Manoj G. | Aremu, Adeyemi O. | Van Staden, Johannes
This greenhouse study tested the effect of smoke‐water and the smoke‐isolated biologically active compound karrikinolide (KAR₁) on growth and photosynthetic pigments of Jatropha curcas L. seedlings. Fifteen‐day‐old seedlings were sprayed once weekly for 5 weeks with three dilutions of smoke‐water (1 : 250, 1 : 500, and 1 : 1000 v/v) or KAR₁ (10–⁷, 10–⁸, and 10–⁹ M). Growth parameters and photosynthetic pigment concentrations of 75‐d‐old seedlings were measured. Foliar application of both smoke‐water and KAR₁ on J. curcas seedlings showed significant increases in stem width, shoot length, chlorophyll a, chlorophyll b, total chlorophyll, and total carotenoid concentrations compared to the untreated control. KAR₁ significantly improved leaf area, shoot and root dry mass, seedling‐vigor index, and photosynthetic pigments as compared to control treatments. These results suggest the possible use of smoke‐water and KAR₁ to achieve a vigorous and well established crop of J. curcas.
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