Screening of suitable primary fodder tritipyrom lines for cultivation under saline conditionsý.

Researchers could find a new high tolerant species of grass named Tritipyrum by crossing between wheat and its wild ancestors, recently. That is a prennual plant with high salt tolerance. Of course, the trait of seed falling in tritipyrum, has been caused its grain yield to be not competitive in comparison with common wheat cultivars although it seems to be modified during breeding attempts. But it can be suitable as a salt tolerant pasture crop. On the other hand, seed falling can be a suitable trait in pasture crops and so it can be used as a pasture crop right now. In order to study the grain and fodder yield of different primary tritipyrum lines under saline and non-saline conditions and physiological and morphological responses of this species and also climatic evaluation of these lines in Yazd city an experiment has been designed with 3 replications that in each replication there were 2 levels of salinity (2 & 14 dS/m) as the main plot and tritipyrum lines were planted in main plots randomly as a split plot design. In order to have uniform emergence conditions under saline and non saline conditions, all treatments were irrigated with non saline water in two primary irrigations. After that, salinity treatment has been done gradually during two following irrigations. In order to control soil salinity, soil samples from 0-30 and 30-60 depth of soils prepared monthly and measured Ece. During growth period different factors has been measured such as the number of tillers, survival %, growth rate, flag leaf area, the number of leaf per plant, plant height, amount of forage and yield. Fodder harvesting was before heading. A part of plots left until physiological seed maturity and then harvested the grain seed. Statistical analysis has been done by SPSS software and finally the mean of following traits have been compared by Duncan test to determine the best treatments under saline and non-saline conditions. Results showed that there is no difference between measured traits under saline and non-saline conditions. Although there were no differences among lines in terms of fodder yield, there were significant differences among lines in terms of yield and yield components in 5% probability. It showed that there is no difference among lines in terms of fodder yield while there are lines with high grain yield such as line 4 and 9.