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Fatemeh Sefatgol and Hamidreza Ganjali
BIOSCIENCE BIOTECHNOLOGY RESEARCH COMMUNICATIONS EVALUATION OF DROUGHT STRESS TOLERANCE IN ADVANCED BARLEY CULTIVARS IN SISTAN REGION 285
CONCLUSION
The results of variance analysis of measured traits
showed that in normal conditions the measured traits in
barley were signi cant except thousands grain weight
and spikes per square meter.The highest biological yield
(52.3 tons per hectare), grain yield (90.3 tons per hectare)
and harvest index (40%) was obtained from the lingnee.
Also the lowest biological yield (08/3 tons per hectare),
grain yield (96/2 tons per hectare) and harvest index
(25/34 percent) was observed for the L.1242. The effect
of measured traits of barley varieties under drought
stress were signi cant only on plant height, number
of grains per panicle and panicle length, In a way that
the maximum height (25/79 cm), number of grains per
panicle (53) and panicle length (72 cm) of Violeta was
obtained. Also, the minimum height (25/87 cm), number
of grains per panicle (25/42) and panicle length (75/58
cm) was observed for the Merzaga. In addition to this
mean squared of drought stress indices for barley varie-
ties on traits such as drought stress intensity (SI), stress
susceptibility index (SSI), Tolerance Index (TOL), stress
tolerance index (STI), ef ciency index medium (MP),
geometric mean productivity (GMP) and harmonic mean
(HARM) was signi cant. The highest values of men-
tioned traits was for the Zahak in common. The low-
est stress (SI), stress susceptibility index (SSI), Tolerance
Index (TOL) to the lowest Lingnee and stress tolerance
index (STI), mean productivity (MP), geometric mean
productivity (GMP) and the harmonic mean (HARM) was
observed for the Brs180. It seems that due to the favora-
ble climatic conditions of this irrigation treatment for
the Lingnee had a positive effect on growth and caused
maximum length and height of this type. The increase
in height and growth will increase leaf area and thereby
cause an increase in photosynthesis which will result
higher dry matter production and yield. Accordingly, the
maximum biomass is observed in this treatment. It could
be said that higher biological yield of Lingnee is because
of its genetic and physiological traits that is associated
with the period of further growth and production of till-
ers. Higher grain yield than other cultivars in Lingnee is
because of higher yield components in this type. Since
the yield of plants is in uenced by cultivar and envi-
ronmental conditions, it can be said that plants reaction
about the yield and yield components is mostly affected
by numerous factors including the type of plant, growth
period, soil texture, soil fertility status and weather con-
ditions. It seems genetic potential of Lingnee, through
a greater impact on increasing the economic yield of
the biomass has been able to raise the value of the har-
vest index in this type. In other words, plant does not
produce additional dry matter, but a large part of the
economic yield is allocated to economic performance of
grain. Based on stress tolerance index (STI) Zahak varie-
ties is one of the types with highest tolerance to drought
stress. Finally, it is suggested that more varieties will
be examined and sustainability indices be used in these
experiments.
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