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Response of high yielding
rice varieties to NaCl salinity in greenhouse
circumstances
M. K.
Motamed1*,
R. Asadi2,
M. Rezaei2
and E. Amiri3
1University
of Guilan, Rasht, Iran.
2Rice
Research Institute of Iran, Rasht, P. O. Box 1658, Iran.
3Islamic
Azad University, Lahijan Branch,
P. O. Box: 1841, Iran.
*Corresponding author. E-mail:
mkmoatamed@yahoo.com.
Tel: +98-911-1347350. Fax: +98131-6690033.
Accepted
22 September, 2008 |
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Salinity is one the biggest constraint to obtain crop
potential yield throughout paddy fields in some part of the
coastal line of rice cultivated area in Iran. In order to
find resistant varieties and study the reaction of some
newly released high yielding varieties to different levels
of salinity of irrigation water an experiment was conducted
at the Rice Research Institute of Iran-Amol station in a
greenhouse. Eight varieties, cultivated in pots, were tested
with three levels of salinity (2, 4 and 6 dS m-1:
S1, S2 and S3, respectively) along with control (S0: EC =
0.8 dS m-1) with 3 replications. The results
showed that salinity adversely affected yield, number of
tillers per pot, filled and unfilled spikes, fertility and
100 grain weight, but increased number of unfilled tillers.
The average of rice yield loss threshold was calculated 1.3
dS m-1. On average, number of panicle and number
of filled spikes accounted for 80 and 59% of total variation
of grain yield, but it decreased by increasing in salinity
level. There was a high correlation between yield and number
of panicle and grain weight per panicle.
Key words: Salinity, NaCl, rice, yield, greenhouse.
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