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ENHANCED PROLINE
SYNTHESIS MAY DETERMINE RESISTANCE TO SALT STRESS IN
TOMATO CULTIVARS
SYED GHIAS ALI1,
ABDUR RAB2, NAQIB ULLAH KHAN2 AND KHALID NAWAB2
Abstract: The physiological and
biochemical responses of tomato cultivars were studied at Khyber
Pakhtunkhwa Agricultural University, Peshawar, Pakistan during 2005-2006
for salt tolerance. Tomato cultivars were Roma Rio Super, Roma V.F.,
Chinese 87-5, Rio Grand and Super Blocky and subjected to salt stress
(75 mM NaCl). Fresh weight, dry weight, and ions sodium and potassium
accumulation, Na+/K+ ratio and proline content
were determined after imposing the tomato cultivars to NaCl salt for 80
days. Salt stress significantly decreased the fresh and dry weight in
Roma Rio Super, Roma V.F, Chinese 87-5 and Rio Grand, however, in Super
Blocky the fresh and dry weight were enhanced under stress conditions.
Salinity stress increased sodium uptake from 191.828 to 436.170 µmg-1
D wt while potassium accumulation decreased from 1033.12 to 926.80 µmg-1
D wt resulting in higher Na+/K+ ratio in stressed
(0.48 g) as compared to unstressed control (0.19). The mean proline
contents also increased from
28.95
to
40.96
µM Proline g-1 F. wt
with the maximum increase (57.378%) in Super Blocky followed by Rio
Grand (49.325%).
1Center of Plant Diversity, University of Peshawar, Pakistan
2Khyber Pakhtunkhwa Agricultural University, Peshawar, Pakistan
Corresponding author:
abdurrabaup@gmail.com
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