Pak. J. Bot., 39(1): 141-149, 2007. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
EFFECT OF ABSCISIC ACID AND BENZYLADENINE ON GROWTH AND ION ACCUMULATION OF WHEAT UNDER SALINITY STRESS A.R. GURMANI, A. BANO* AND M. SALIM Abstract: A glass-house pot experiment was conducted to assess the role of Abscisic
acid (ABA) and Benzyladenine (BA) on growth and ion accumulation of
two spring wheat cultivars viz., cv. Inqulab-91 and cv. SAARC-1 under
salinity stress. Seeds of both cultivars were treated prior to sowing
with ABA and BA each at 10-5 M for 24h. Three weeks old plants
of both the cultivars were exposed to 0 and 100 mol m-3 NaCl.
Plants were harvested three weeks after salt treatment. Fresh and dry
weight of shoot and root decreased with salt treatment, whereas ABA
and BA treatments caused a significant ameliorative effect on both the
cultivars. Under salt stress, plant height was more adversely affected
in Inqulab-91 than in SAARC-1. Salt treatment increased the concentration
of Na+ and Cl- in flag leaf of both the cultivars.
Both ABA and BA treated plants showed significant decrease in Na+
content but increased K+ content in flag leaf of both the
cultivars. ABA and BA treatment decreased plant height but increased
number of grains per spike and grain yield. ABA and BA treatments further
augmented the stimulatory effect of salt on proline accumulation. Higher
proline accumulation was observed in SAARC-1 than in Inqulab-91 with
ABA and BA treatment. Under salt stress the hormone mediated osmoregulation
by increased proline production and the selectivity in uptake and accumulation
of toxic ions like Na+ and Cl- has been discussed.
BA was more effective to increase chlorophyll "a" & "b,
flag leaf area, number of grains per spike and grain yield, under salt
stress as well as in non saline soil than ABA.
Institute of Natural Resources & Environmental Science, LRRP, National
Agriculture Research Centre,
Islamabad, Pakistan. |
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