Abstract:
Seed priming with
gibberellin (GA) enhances seed germination
performance; but the quality of primed
seeds in aging condition often reduces more
than non-primed seeds. An experiment was
conducted to evaluate the effect(s) of heat
shock treatments on germination
characteristics and enzyme activity of
primed mountain rye (Secale montanum)
seeds with gibberellin under accelerated
aging. Heat shock treatments, can
substantially decrease the speed of quality
reduction of mountain rye (Secale
montanum) primed seeds. In primed seeds
with gibberellin, which has non-aged, the
highest germination percentage (GP) and
normal seedling percentage (NSP) was
attained from heat shock treatment at 35°C
for 3 h, also after 3 days aging, it was
attained from heat shock treatment at 35°C
for 3 h. After 3 days of aging the highest
germination index (GI) was attained from
unprimed seeds, but no significant
difference with heat shock treatment at 35°C
for 3 h. The minimum means time
germination (MTG) was in heat shock
treatment at 30°C for 3 h in non-aged seeds.
After 3 days of aging, heat shock treatment
reduce MTG as compared to the primed
seeds. Heat shock treatment at 35°C for 3 h
increased seed vigor index (SVI) as
compared to the unprimed and primed seed
in non-aged seeds and after 3 days aging.
Seedling length (SL) increases with heat
shock treatment at 30°C for 4 h in non-aged
seeds as compared to the primed and
unprimed seeds, but after 3 days of aging
heat shock treatment except at 35°C for 3 h
and 40°C for 4 h reduced SL as compared to
the primed and unprimed seeds. Also, heat
shock treatments increase some antioxidant enzymes [Catalase (CAT), Ascorbat
peroxidase (APX)].
