Pak. J. Bot., 38(3): 663-672, 2006. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
TIME COURSE OF ION ACCUMULATION AND ITS RELATIONSHIP WITH THE SALT TOLERANCE OF TWO GENETICALLY DIVERSE LINES OF CANOLA (BRASSICA NAPUS L.) M. QASIM AND M. ASHRAF*
Abstract: A greenhouse experiment was conducted to examine the time course of
ion accumulation in two genetically diverse lines of canola (Brassica
napus) viz., Dunkeld (salt tolerant) and Cyclon (salt sensitive)
subjected to 2.4 (control), 4, 8, and 12 dS m-1 of NaCl.
Plants were harvested every 10-day interval after the initiation of
salt treatment and harvesting continued until 5th harvest
i.e., 50 days after the initiation of salt treatment. An age-dependent
accumulation of Na+ and Cl- occurred in both lines and the
discrimination in the two lines with respect to ion accumulation was
discernable at the last three harvests, Dunkeld was significantly lower
in shoot Na+ and Cl- as compared to Cyclon. The
salt tolerant line Dunkeld maintained higher K+/Na+
and Ca2+/Na+ ratios than those of the salt sensitive
line Cyclon under saline conditions. However, the discrimination between
the two canola lines with respect to K+/Na+ ratio
was discernable at the later growth stages, whereas that of Ca2+/Na+
ratio at all stages. Discrimination between the two genetically diverse
lines of canola with respect to accumulation of toxic ions was only
possible at the later stages of vegetative growth rather than at the
early stages.
Department of Botany, University of Agriculture, Faisalabad 38040,
Pakistan. |
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