Bhavana Gaur* and Varada Gaur**
*Department of Botany,
R.G. (P.G.) College, Meerut–250 001,(U.P.) India
Corresponding author’s email: gaurbhavana@yahoo.com
Abstract: Senescence in Vigna mungo (L.) Hepper is studied here. The biochemical impact of endogenous hormone inherent in Eucalyptus leaf extract on it was specially studied. The studies were made by taking aqueous extract of dried leaves of Eucalyptus citriodora at various concentrations and compared with control. During study, the various concentrations of Eucalyptus leaf extract taken were W/V – 1:200, 1:250, 1:500 and 1:1000 respectively. Senescence was studied in intact and excised leaves of Vigna mungo (L.) Hepper. Observations were made both in light and dark in species under investigation. The inference drawn out of experimentation are worth noticing. Whether use of dried leaves of Eucalyptus can be done as bio-fertilizer in seedling growth of Vigna mungo (L.) Hepper by preventing leaf senescence, was to be seen. It was found out that in Eucalyptus leaf extract in light, senescence was controlled in intact leaves. But in dark, senescence was promoted at concentrations, W/V – 1:200, but minimum senescence occurred at dilute concentrations and in control in intact leaves. In excised leaves, senescence was promoted at concentration, W/V – 1:200, both in light & dark. However, at other concentrations, darkness controlled senescence. Lower concentrations of Eucalyptus leaf extract are recommended as biofertilizers for Vigna mungo (L.) Hepper.
Key words: Senescence, Biochemical impact, Leaf extract, Biofertilizer, Endogenous hormone, Intact leaves, Excised leaves, Light and Dark.
REFERENCES
AL–Subai, M.Y. and Horwath, I. (1981). The effect of alternating periods of light and darkness on the tissue of Phaseolus vulgaris cultivar. Acta Univ. Szged Acta Biol., 26: 41-50.
Blake, T.J. (1981). Diebark and Stump Senescence following decapitation of Eucalypts in relation to auxin and phenols. Can. J. Vor. Rs. 11(2): 291 – 297.
Boukef, K.; Balarisand, G.; Lalleman, M. and Benard, P. (1976). Study of Phenolic acids isolated from leaves of Eucalyptus globulus Labill. Plant. Med. Phytother, 10(1): 24 – 79.
Fumasoni, S.(1959).Chromatographyof aqueous extracts of Eucalyptus rostrata, Cellulose corta, 10(9): 21 23.
Gurudev, S. and Saxena, O.P. (1991) Seed treatments with bioregulators in relation to wheat productivity in: New Trends in Plant physiology proceedings. National symposium on Growth and Differentiation in plants, New Delhi, India pp.: 201 – 210.
Hills, W.E. (1959). Shikmic acid in the leaves of Eucalyptus sieberiana F. Muel. Jour. Expt. Bot., 10(28): 87 – 90.
Kumar, J. and Kumar, S. (2005). Effect of Maleic Hydrazide on growth and flowering in Balsam (Impatiens balsamine L.) J. of Orn. Hort., 7(1): 129 – 130.
Lewington, R.J.; Talbot, M. and Simmon, E.W. (1967). The yellowing of attached and detached cucumber cotyledons J. Exp. Bot., 18: 526 – 534.
Martin,C.andThimann K.V.(1972). The role of protein synthesis in the senescence of leaves. 1, The formation of protease. Plant Physiol.,49: 64–71.
Mc Ghie, D.A. and Posner, A.M. (1981). The effect of plant top material on the water repellence of fired sands and water repellant soils, Aust. J. Agric. Res., 32: 609-620.
Medawar,P.B.(1957).TheUniquenessof the Individuals. Basic Books, New York pp 191.
Mehetre, S.S. and Lad, S.K. (1995). Effect of foliar applications of growth substances on growth and yield of soyabean. Genet. Newslatt., 22: 132-134.
Naidu, C.V. and Swamy, P.M. (1995). Effect of gibber-ellic acid on growth, biomass production and associated physiological parameters in some tree species. Indian J. Pl. Physiol., 38(1): 15-17.
Patons, D.M.; Dhawan, A.K. and Willing, R.F. (1980). Effect of Eucalyptus rupicola growth regulators on the water loss from plant leaves. Plant Physiol. (Bethesda), 66: 254-256.
Sanees Frank, C.V. and Elaine, R. Ingham (1997). Conventional organic alternatives to methyl bromide, on California strawberries Compost. Science and Utilization. Spring p. 23 – 37.
Sharma, K.; Rao, B. and Pande, N. (2009). Allelopathic effect of seven weed extracts on seed germination in different varieties of wheat (Triticum aestivum L). J. Indian Bot. Soc., 88 (1&2): 35 – 40.
Singhal, R.M. and Sharma, S.D. (1981) changes in biochemical composition of soil organic matter consequent upon growing Eucalyptus in sal zone of Doon Valley, India. Indian J. For., 4: 48 – 49.
Sitton, D.C. and Kende, H. (1967). Decreased cytokinin production in the roots as a factor on shoot senescence. Planta, 73: 296 – 300.
Srivastava, B.L.S. (1968). Acceleration of senescence and increase of chromatin associated nucleases in barley leaves by abscissin and its reversal by kinetin. Biochem. Biophys. Acta, 169: 534 – 536.
Williams, R.F. (1936). Physiological ontogeny in plants and its relations to nutrition. Aust. J. Exp. Biol. Weed Sci., 14: 165 – 185.Yardeni, D. and Evenari, M. (1952). The germination inhibiting, growth inhibiting and phytotocidal effect of certain leaves and leaf extracts. Phyton (Buenos-Aires), 2: 11-16.