Abstract
Soil-borne diseases are a major threat to guar cultivation all over the world. Many soil-borne fungi, including Rhizoctonia, infect plants causing damping-off and wilt diseases. Micronutrients play an important role in controlling the disease. This investigation was aimed to determine the effect of different concentrations of zinc (Zn2+) on biochemical parameters of guar, in relation to resistance against root rot. The guar seedlings were grown under 10 and 20 mg Zn2+ kg−1 soil, in earthen pots, containing inoculated soil. The inoculation of soil was done by the pretreatment of soil with Rhizoctonia inoculums. In the experiment, a control with uninoculated soil was also maintained. Lesion size was decreased by 35.1 and 46.8 % over control at Zn2+ 10 and 20 mg kg−1 soil treatments, respectively. Chlorophyll content, non-structural carbohydrate content and IVDMD (In Vitro Dry Matter Digestibility) per cent decreased in inoculated seedlings as compared to uninoculated seedlings. Phenol content and structural carbohydrates (Acid Detergent Fiber, cellulose, lignin and silica) increased in inoculated seedlings and this increase was further enhanced by Zn2+ 20 mg kg−1 soil treatment, to counteract the fungal invasion. Moreover, a significant increase in IVDMD was also observed at 20 mg Zn2+ kg−1 soil treatment. These results suggested that Zn2+ 20 mg kg−1 soil treatment might be used as soil-nutritive agent to provide resistance in plants against fungal diseases. The application of 20 mg Zn2+ kg−1 soil treatment could also prove useful in minimizing the use of fungicides.
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Acknowledgments
The authors are highly indebted to Dr. S.K. Pahuja from Forage Section, Dr. S.K. Gandhi and Dr. Naresh Mehta from Department of Plant Pathology, CCS Haryana Agricultural University, Hisar for their co-operation and for providing all the necessary facilities during investigation.
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Wadhwa, N., Joshi, U.N. Zinc supplementation induces resistance against root-rot in guar [Cyamopsis tetragonoloba (L.) Taub] seedlings. Australasian Plant Pathol. 45, 465–471 (2016). https://doi.org/10.1007/s13313-016-0439-y
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DOI: https://doi.org/10.1007/s13313-016-0439-y