Journal of Stress Physiology & Biochemistry, Vol. 6 No. 3
2010, pp. 102-113 ISSN 1997-0838
Original Text Copyright (cc) 2010 by Singh, Chaturvedi, Bose
ORIGINAL
ARTICLE
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QueryDate : 2016-12-24
Cites : 21
EFFECTS OF SALICYLIC ACID ON SEEDLING GROWTH AND
NITROGEN METABOLISM IN CUCUMBER (CUCUMIS
SATIVUS L.)
Singh, Pramod Kumar A*, Chaturvedi, Varun Kumar A,
Bose, Bandana B
APlant Physiology Lab,
Department of Botany, Udai Pratap Autonomous College, M.G. Kashi
Vidyapeeth University, Varanasi-221002, (U.P.), INDIA BDepartment of Plant Physiology, Institute of Agricultural
Sciences, Banaras Hindu University, Varanasi- 221005, (U.P.), INDIA *Fax: +91-0542-2281799; Phone: +91-9415388189 *Email-
drpksingh2001@yahoo.com
Received May 28, 2010 Salicylic acid is involved in the regulation of metabolic
activity and defense mechanism in plants under various stress
conditions. Present study was conducted to determine the effects of
salicylic acid (10 to 500 μM) on seedling growth, development and
nitrogen use efficiency in cucumber (Cucumis sativus L.) plants with or
without nitrogen nutrient. Salicylic acid increased contents of
chlorophyll, total non-structural carbohydrate and total nitrogen, as
well as nitrate assimilation through the induction of nitrate reductase
(EC 1.6.6.1) activity in isolated cucumber cotyledons. Accumulation of
salicylic acid was two-fold higher in cotyledons without nitrate supply
in comparison to that with nitrate supply. Further 50 μM of SA induced
enhancement in seed germination and growth characteristics. However
higher salicylic acid concentrations inhibited above physiological
characteristics. Results show that, field application of salicylic acid
need optimum physiological concentration (e.g., 50 μM) to increase
nitrogen use efficiency particularly during germination and seedling
growth.
