1 Young Researchers Club,
Zanjan Branch, Islamic Azad University, Zanjan, Iran 2 Department of Agronomy and
Plant Breeding, Campus of Agriculture
and Natural Recourse, Razi University, Kermanshah,
Iran 3 Department of Agronomy and Plant Breeding, Faculty of Agriculture, Maragheh University, Maragheh, Iran
*E-Mail: majid.abdoli64@gmail.com
Received August 19, 2013
Salt stress as a major adverse
factor can lower germination, ion toxicity, reduction in enzymatic and
photosynthetic efficiency and other physiological disorders and
ultimately lower crop productivity in salinity zones. As growth
regulators are involved in altering growth processes in plants, it is
possible that they might even reduce the detrimental effects of
salinity by stimulating growth. But their physiological roles are not
well known. In example, about the roles of IAA in salinity conditions
are not similar viewpoints. For this purpose a factorial experiment
based on completely randomized design was conducted with influence of
foliar application of Indole-3-Acetic Acid (IAA) in farm on germination
percent and seedling growth parameters of wheat (cv. Marvdasht) under
different levels (0, 40, 80 and 120 mM) of NaCl salinity with 3
replications, during 2012 in the laboratory research of the Department
of plant breading and agronomy, Faculty of Agriculture, Maragheh
University in Maragheh state in Iran. The results of this study
indicate, that salinity decreased the plumule, radicle
and seedling length and plumule,
radicle and seedling dry weight, seed
germination and seedling vigor index,
whereas increase in mean germination
time and no signification plumule/radicle ratio observed in
the cultivar tested. Also, application of IAA at cell division stage of
grain growth caused significant increase in seedling growth parameters
under different salinity levels. The interaction between application of
IAA and salinity levels significantly affected final germination
percentage. Highest final germination percentage was recorded with IAA
with increasing salinity level from
0 up to 120 mM NaCl (98.3,
98.3, 96.7 and 100% without significant
differences between them, respectively).
