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Pak. J. Bot., 46(3): 957-971, 2014. |
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Updated: 05-06-14 | ||||
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HEAT-INDUCED REGULATION OF ANTIOXIDANT DEFENSE SYSTEM AND NUTRIENT ACCUMULATION IN HEXAPLOID BREAD WHEAT (TRITICUM AESTIVUM L.)
MUHAMMAD AZHAR ZIA1, MUHAMMAD ASHRAF2,3*, NUDRAT AISHA AKRAM4 AND MUJTABA HUSSAIN1
Abstract: Ten cultivars (five registered S-24, Inqlab-91, Saher-2006, Fsd-2008, and Lasani, and five candidate cultivars P.B-18, M.P-65, S.H-20, AARI-10, and G.A-20) of spring wheat (Triticum aestivum L.) were examined for high temperature stress tolerance. Plants were grown in soil filled pots in the Botanical Garden of the Department of Botany University of Agriculture Faisalabad, Pakistan. Three different temperature regimes (30, 40 and 50°C) were applied at two different growth stages (tillering and boot) for three temperature durations 30, 60 and 90 min in a growth chamber. The leaf and root samples were collected after two weeks of temperature treatment and then analyzed for enzymatic and non-enzymatic antioxidants as well as inorganic nutrients (N, P, K+, Ca2+). At the end, data obtained were statistically analyzed to distinguish heat tolerant from non-tolerant wheat cultivars. After appraisal of growth, antioxidant defense system and uptake of nutrients it was found that cvs. S-24, Inqlab-91, Saher-2006, Fsd-2008, Lasani and G.A-20 exhibited better thermo-tolerance capabilities than the other wheat cultivars (P.B-18, M.P-65, S.H-20, AARI-10). Among the thermo-tolerant wheat cultivars, G.A-20 and Lasani were superior in maintaining shoot fresh weights and shoot length, high antioxidant activities and better nutrient uptake at both tillering and boot stages. The response of all cultivars to heat stress applied at the tillering stage or boot stage was almost the same.
1Department of Botany, University of Agriculture, Faisalabad, Pakistan 2University College of Agriculture, University of Sargodha, Sargodha, Pakistan 3Department of Botany and Microbiology, King Saud University, Riyadh, Saudi Arabia 4Department of Botany, Government College University Faisalabad, Pakistan *Corresponding author’s email: ashrafbot@yahoo.com |
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