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Pak. J. Bot., 42(1): 129-139, 2010. |
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Updated: 08-03-10 | ||||
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EFFECT OF SALINITY ON UPTAKE OF MICRONUTRIENTS IN SUNFLOWER AT EARLY VEGETATIVE STAGE
ABDUL KABIR KHAN ACHAKZAI, SAFDAR ALI KAYANI AND AZHAR HANIF
Abstract: A pot culture
experiment was conducted to study the effects of 4 different levels of
salinity (EC = 1.19, 9.54, 16.48 and 22.38 mS/cm) on the uptake of
micronutrients (viz., Cu, Mn, Fe and Zn) by 2 varieties of sunflower (Helianthus
annuus L.) at early vegetative stage. Salinity levels were prepared
by dissolving calculated amount of NaCl2, Na2SO4,
CaCl and MgCl2 (4:10:5:1) in half strength Hoagland culture
solution. In response to various levels of salinity, the uptake of all
mentioned micronutrients of roots and shoots of sunflower exhibited
significant response (p<0.05 and p<0.01) while only the response of Mn
uptake in shoot was found non significant. A maximum significant uptake
of Cu, Mn, Fe and Zn in shoot (19.50, 120.67, 1647.67 and 59.17 µg/g) is
obtained under highest dose of applied salinity (22.23 mS/cm) whereas
with the exception of Zn, a maximum significant uptake of Cu (25.67
µg/g), Mn (144.87 µg/g), and Fe (5837.5 µg/g) in root as well in highest
dose of salinity was observed. With reference to ratio of Fe and Zn
uptake in root and shoot, variety DO 730 responded well than variety DO
728. Results on the bases of grand sum values depicted 20.38 and 69.33%
decrease in uptake of Cu and Fe, but 7.65 and 18.37% increase in uptake
of Mn and Zn in shoot over root in both the varieties, respectively was
observed. Department of Botany, University of Balochistan, Quetta, Pakistan. E-mail: profakk@yahoo.com |
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