Reddy MN and Sireesha CH. Key words: Groundnut, Stem rot, Sclerotium rolfsii, Oxidative enzymes, Biochemical constituents.
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1 Role of oxidative enzymes and biochemical constituents in imparting resistance to groundnut (Arachis hypogaea L.) against stem rot disease caused by Sclerotium rolfsii Reddy MN and Sireesha CH Abstract Enzyme activity and biochemical constituents of healthy and stem rot infected tissues of susceptible variety of groundnut TMV were evaluated. Results revealed that higher activity of Oxidative enzymes (catalase, polyphenol oxidase and peroxidase) were present in infected leaves than healthy ones. In case of Biochemical constituents, higher amount of total and Orthodi hydric phenols and protein content was observed in infected plants as compared to healthy plants. Higher content of sugars and chlorophyll was observed in healthy plants as compared to infected plants. Key words: Groundnut, Stem rot, Sclerotium rolfsii, Oxidative enzymes, Biochemical constituents. Reddy MN and Sireesha CH Department of Microbiology, S P Mahila Visvavidyalayam, Tirupati70, India. Corresponding author: mopuri_nr@yahoo.com Web address: Article citation: Reddy MN and Sireesha CH. Role of oxidative enzymes and biochemical constituents in imparting resistance to groundnut (Arachis hypogaea L.) against stem rot disease caused by Sclerotium rolfsii. Bioresearch Bulletin 0; 060. SAPIENCE RESEARCH LABS 0 This Open Access article is governed by the Creative Commons Attribution License ( which gives permission for unrestricted use, noncommercial, distribution, and reproduction in all medium, provided the original work is properly cited.
2 INTRODUCTION: Groundnut (Arachis hypogaea L.) is an important annual oil seed crop (Brown, 999). A large number of diseases attack groundnut in India (Mayee, 987: Mayee and Datur, 988: Ganesan and Sekar, 00a). The majority is caused by fungi and several of them are yield reducers in different regions and seasons (Mayee, 99). Among the soil borne fungal diseases, stem rot caused by S.rolfsii is a potential threat to groundnut production and is of considerable economic significance for the crop grown under irrigated conditions. This disease causes severe damage during any stage of growth, and yield losses over % have been reported (Mayee and Datar 988). The present communication deals with the role of various oxidative enzymes and different Biochemical constituents in imparting resistance to groundnut plants against stem rot disease. MATERIALS AND METHODS: Enzyme assay: and infected seedlings of TMV variety were taken and different enzymes viz.catalase, peroxidase and polyphenol oxidase were assayed at different stages (,,, 7 and days) to know about their role in defense mechanism of groundnut plants against stem rot disease. Catalase, peroxidase and polyphenol oxidase were assayed as per Thimmaiah (999). Catalase activity was assayed by estimating the residual H O in the reaction mixture which was then determined by oxidation with KM n O titrimetrically. The catalase activity was expressed as mg of hydrogen peroxide destroyed in five min per gram fresh weight of the tissue. Peroxidase activity was assayed using odianisidine as hydrogen donor and H O as electron acceptor. The rate of formation of yellow orange colored dianisidine dehydrogenation product was a measure of the peroxidase activity and assayed spectrophotometrically at 0 nm. The specific activity of enzyme was expressed as units/min/mg protein. Polyphenol oxidase was measured as rate of increase in absorbance colorimetrically at 0 nm with the oxidation of catechol as the substrate. The enzymatic activity was expressed as units min. at 0 nm considering one enzyme unit as the change in absorbance of 0.00/minute and the specific activity as units/min/mg protein. Biochemical constituents: For assaying biochemical constituents healthy and infected tissues of TMV variety of groundnut were analyzed for contents of various biochemical constituents viz. total sugars, reducing sugars, nonreducing sugars, total and orthodihydric phenols, soluble protein and chlorophyll to know their possible role in imparting disease resistance. For estimation of sugars and phenols seedlings of stages (,,, 7 and days) both healthy and diseased were used. Ethanol extraction of plant material was made by following the method of Mahadevan et al., (96). Ethanol extraction was used for estimating phenols and sugars. Reducing sugars were estimated by method of Nelson (9), total sugars was calculated by the method of Inman (96) and Nelson (9). And nonreducing sugars were calculated by subtracting the reducing sugars from total sugar content. Total phenols were estimated as per Bray and Thorpe (9). Orthodi hydric phenols were estimated as per Mahadevan and Sridhar (986). The estimation of proteins was done as per method developed by Lowry et al., (9). Estimation of chlorophyll was done as per Thimmaiah (999). RESULTS AND DISCUSSION: An insight in to the data (Table ) showed that diseased samples showed higher enzyme activity than their healthy samples and with increase in age of plants the enzyme activity also showed in increasing trend. Our results are in agreement with the findings of Rajalaxmi and Ramarethinam (000) and Avallone et al., (00) who reported increased activity of polyphenol oxidase and peroxidase in tea leaves infected with blister and increased activity of laccase in pine apple fruits infected by black spot. Different enzymes have different mode of action in imparting resistance. Increased peroxidase activity has often been studied in connection with the oxidation of phenolic substances in the diseased plants and resistance in host attributed to toxicity of these oxidation products (Fric, 976). Moreover, enhanced peroxidase activity has been linked with synthesis of lignin (Ride, 97). Catalase activity increased during infection as a mechanism to scavange fungitoxic H O (Montalbini, 99). polyphenol oxidase is commonly found in plant. It oxidizes phenols to highly fungitoxic quinines and is highly inhibitory to some plant fungi (Vidyasekaran, 99). Sain and Gour (008) showed increased levels of peroxidase and catalase in Parthenium hysterophorus infected with 07 Bioresearch Bulletin 0; 060
3 Table : Activity of different oxidative enzymes in healthy and infected groundnut hypocotyls at various stages of disease development. Peroxidase (units/min/mg protein) 67. ± ± ±.0. ± ± ± ± ± ± ±.6 X.axonopodis. In our studies the increased enzyme activity can be attributed to activation, solubilization or de novo synthesis of enzymes or their products by the invading pathogen. Biochemical resistance or susceptibility in plants against any disease depends mainly on preexisting; pre formed or induced substances by the pathogen in the host. The nutritional status and concentration of biochemical constituents in plants prior to infection may determine the severity of disease. Sugars play an active role in the inhibition of pectinolytic and cellulolytic enzymes which are essential for the pathogen (Bateman and Millar, 966). Moreover, sugars are precursors of phenolics which are highly toxic to microorganisms Polyphenol oxidase (units/min/mg protein). ± ± ± 0.6. ± 0.7. ± ± ± ± ± ± 0.7 Catalase (mg of H O destroyed in min/g fresh weight).7.7 ± 0.08 ± ± 0.06 ± ± ± ± 0.0 ± (Vidyasekharan, 978). plants recorded higher amount of sugars than diseased plants (Table ). Our results are in agreement with the findings of Verma and Singh (99) and Sultana et al., (998) who reported higher amount of sugars in healthy plant parts as compared to diseased ones. The reduction in sugar content after infection may be due to rapid hydrolysis of sugars during pathogenesis through enzymes (hydrolases)secreted by pathogens and subsequent utilization by pathogens for their development. In our studies, higher amount of total and O.D. phenols was observed in diseased plants as compared to healthy plants (Table ). The results of present studies are in agreement with the findings Bioresearch Bulletin 0; ± 0. ± Standard error (S.E) + = Increase over.8 ± 0.0 Table : Sugars (mg/gm fresh weight) in healthy and infected groundnut hypocotyls at various stages of disease development..8 ± 0..9 ± ± ± ± Total sugars Reducing sugars Non reducing sugars % over healthy infected Control ± 0. ± 0.08 ± 0.08 ± 0.08 ± ± 0.09 ± 0.0 ± 0.07 ± 0.0 ± ± ± 0.08 ± 0.0 ± 0.06 ± ± ± 0.09 ± 0.0 ± ± 0.09 ± 0.0 ± Standard error (S.E) = Decrease over ± ± 0.0 ± ±
4 Table : Total and orthodihydric phenols (mg/gm fresh weight) in healthy and infected groundnut hypocotyls at various stages of disease development. Total phenols Orthodi hydric phenols ± ± ± ± ± ± ± ± ± ± ± ± Standard error (S.E) + = Increase over of Ganguly (99) and Singh (000) who observed higher phenol content in diseased plant parts of resistant varieties. The postinfection increase in phenolic content could be due to a number of factors including enhancement of synthesis, translocation of phenolics to the site of infection and hydrolysis of phenolic glycosides by fungal glycosidases to yield free phenols and the increase in level of phenolic compounds in infected leaves may be due to translocation of phenolics to the site of infection (Parashar et al., 987). Table : Total proteins (mg/gm fresh weight) in healthy and infected groundnut hypocotyls at various stages of disease development..6. ± 0.0. ± ± 0.0 Total proteins.6.79 ± ± ± ± ± Standard error (S.E) + = Increase over Analysis of protein content revealed higher protein content in diseased plants as compared to healthy plants (Table ). Kaur and Dhillon (990) observed an increase in protein content of groundnut infected with Cercospora personatum. Higher total protein content in infected pods of T9 variety of Vigna mungo susceptible to leaf crinkle virus was observed by Malik et al., (00). It is a wellknown fact that enzymes are proteins and the increased synthesis of proteins during the infection may be due to activation of enzymes which are essential for the synthesis of various defense chemicals (Vidyasekaran. 00). The increase in protein content may have resulted from synthesized proteins in the infected host (Uritani. 97). Investigations on chlorophyll content revealed that higher content was observed in healthy plants as compared to diseased plant parts (Table ). The loss of chlorophyll in diseased leaves under the present investigation may be due to interference by pathogen in the normal chlorophyll synthesis or breakdown of chlorophyll due to activation of enzymes that degrade chlorophyll (Rathore et al., 00). ACKNOWLEDGEMENTS: This work forms part of program of work of the Major Research Project sanctioned to Prof M N Reddy, by the University Grants Commission, New Delhi, India. Thanks are also due to the sanction of Fellowship to the Project Fellow, Sireesha, CH in the Project. 09 Bioresearch Bulletin 0; 060
5 Table : Chlorophyll (mg/gm fresh weight) in healthy and infected groundnut hypocotyls at various stages of disease development. Total chlorophyll Chlorophyll a Chlorophyll b ± 0.0 ± 0.0 ± ± 0.0 ± 0.07 ± ± 0.0 ± 0.0 ± ± 0.0 ± 0.0 ± ± 0.08 ± 0.0 ± 0.0 ± ± 0.09 ± 0.0 ± ± 0.00 ± ± 0.06 ± 0.08 ± 0.07 ± ± Standard error (S.E) = Decrease over REFERENCES: Avallone S, Guiranol JP, Brilliant JM and Teisson C. 00. Enzymic browning and biochemical alterations in black spot of pineapple. Curr. Sci., 7:8. Bateman DF and Millar RL Pectic enzymes in tissue degradation. Ann. Rev. phytopath., :96. Bray HG and Thorpe WV. 9. Analysis of phenolic compounds of interest in metabolism. Methods of Biochemical analysis :7. Brown RG Diseases of Cereal Crops and Annual Oil Seed Crops. In: Plant Diseases and their Control. (Ed. R.G. Brown). Sarup & Sons, New Delhi. 97. Fric F Oxidative enzymes. In: Encyclopedia of plant physiologyiv. (Ed.) R. Heitefuss and P.H. Williams. Physiological Plant Pathology. Springer Verlag, Berlin, Heidelberg. New York Ganguly LK. 99. Biochemical alteration in respect of total phenols, sugars and protein contents in Rhizoctonia solani Kuhn. Inoculated rice plants. J. Mycopathol. Res., :8. Ganesan S and Sekar R. 00a. Bio mechanism of Groundnut (Arachis hypogaea L.) DiseasesTrichoderma system. In: Biotechnological applications in Environment and Agriculture, (Eds.G.R.Pathade and P.K. Goel).ABD Pub. Jaipur. India. 7. Inman RE. 96. Disease development, disease intensity and carbohydrate levels in rusted bean plants. Phytopathology :07. Kaur J and Dhillon M Biochemical alteration in groundnut leaves induced by Cercosporium personatum. Indian J. mycol. Pl. path. 9:6. Lowry OH, Rosebrough NJ, Farr AL and Randall RJ. 9. Protein measurement with the FolinPhenol reagent. J. Biol. Chem., 9:67. Mahadevan A, Kuc J and Williams EB. 96. Phytopathology : Mahadevan A and Sridhar R Methods in physiological plant pathology. ( rd Ed.) Sivakami Publications, Chennai. 88. Malik S, Kumar P, Panwar JDS and Rathi YPS. 00. Physiological and biochemical alterations induced by urdbean leaf crinkle virus in Vigna mungo. Ann. Pl. protect. Sci., 0:99. Montalibini P. 99. Effect of rust infection on leaves of uricase allantoinase and ureides in susceptible and hypersensitive bean leaves. Physiol. Mol. Pl. Pathol., 9:788. Mayee CD Diseases of groundnut and their management. In: plant protection in field crops. Bioresearch Bulletin 0;
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