نصرت الله طباطبایی فرد

Wheat leaf rust, caused by Puccinia triticina Eriks, is one of the most important wheat diseases due to the extent of dispersion and damage in the world. This research project was conducted in order to evaluate reaction of 111 wheat genotypes of Elite Regional Wheat Yield Trials (ERWYT-97) to wheat rust disease under field conditions in Gorgan, Sari and Ahvaz. At the planting seasons, each genotype was planted in two meter rows in three replications for two years. In Karaj, resistance of genotypes was evaluated at seedling stage and under greenhouse conditions. In greenhouse, data were recorded 12 days after inoculation by McIntosh et al. method. The results showed that out of 111 advanced wheat lines, four climates had 25 acceptable resistance lines at three locations in two years. 86 lines were susceptible in one area or over two years. Also 7, 25, 7, 3, 7 line of 26 promising lines of South Zone wheat, the 25 promising lines of North Zone wheat, 20 promising lines of Cold Zone wheat 20 promising lines of Moderate Zone wheat, 20 promising line of salinity wheat respectively showed only one resistance line.

A bread wheat breeding line that led to release of Tallaei cultivar introduced from International Research Center for Maize and Wheat (CIMMYT) to Iran through an international nursery in 2009 and was evaluated in a primary trial in Islam Abad-Gharb research station and due to its favorable characteristics was selected for further evaluation. This line showed grain yield of 6967 and 5370 kgha-1 under normal irrigation and terminal drought conditions, respectively, while mean grain yields of four check cultivars: Parsi, Sivand, Bahar and Pishtaz for those two conditions were 6857 and 3850 kgha-1, respectively, Aforementioned line showed grain yield of 4851 kgha-1 in advanced yield trial of temperate regions breeding program under water deficit conditions compared to 4631 khha-1 of drought tolerant check cultivar "Sirvan" in three locations, hence selected for final evaluation in adaptation trial. Grain yield of this line which was presented as M-91-18 at the adaptation trial was 7563 and 6385 kgha-1 against 8022 and 6200 kgha-1 of Parsi check cultivar under normal and water stress conditions, respectively, during two cropping seasons 2012-13 and 2013-14. This line showed overall mean grain yield, of 9583 and 8042 kgha-1 in normal irrigation and water deficit conditions under extensional farmer fields, respectively. For these two conditions check cultivar Parsi showed 7875 and 6828 kgha-1 records. Grain yield potential of this line was recorded as 10070 and 10670 kgha-1 in Alborz and Kermanshah farmers' fields, respectively. According to the latest evaluations the response of this line to yellow and leaf rusts was moderately resistant under severe artificial infection. Wheat line M-91-18 has considerable earliness and good bread making quality and based on its good agronomic characteristics in 2017 this line was released as Tallaei, for cultivation under normal and terminal moisture stress conditions in temperate agro-climatic regions.

Nowruz cultivar, with pedigree of GOB/Aleli//Canela/3/Arupo*2/Jet/4/Arupo/K8755//Mora, was resulted from a cross in CIMMYT and subsequent selection in the segregating population and was initially introduced to Iranian national barley breeding in 2007-08 as a pure line. Based on its yield potential and other appropriate agronomic traits this line was selected for further evaluation in the warm regions. Results of observation nursery, barley yield trials and on-farm trials in south warm and dry zone of Iran indicated that Nowruz had a good level of lodging resistance, high number of tillers and high grain yield as well as its desirable agronomic characteristics compared to check cultivars Nimrooz and Zahak. In the Elite Barley Yield Trial conducted in Ahvaz, Darab and Zabol research stations in 2010-13 cropping seasons, Nowruz with average grain yield of 5805 kgha-1 had 9% higher yield compared to Nimrooz check cultivar with grain yield of 5350 kgha-1. Nowruz is a two-rowed spring barley with an intermediate spike density, strong and short stem, high number of tillers and genetic deletion of lateral sterile florets in spike. Also, it shows resistant to moderately susceptible reactions to powdery mildew and barley stripe but completely resistant reaction to net blotch. Based on its desirable agronomic characteristics, Nowruz is expected to be spread over farmer's lands in south warm and dry zone of Iran.

The main purpose of this research was to identify barley promising lines with high grain yield and yield stability for warm region of Iran. In this experiment, 17 barley promising lines and two check cultivars were evaluated in five agricultural research stations; Ahvaz, Darab, Zabol, Gonbad and Moghan, Iran, in 2015-16 and 2016-17 cropping seasons, using randomized complete block design with three replications. Combined analysis of variance showed significant effect of year, year × location and year × location × genotype on grain yield. To identify genotypes with high grain yield and yield satbilty, Lin and Binchr('39')s superiority statistic and GGE biplot analysis method were employed. The lowest values of Lin and Binchr('39')s superiority statistic were for lines No. 2, 3 and 9. GGE biplot analysis revealed that the first and second principle components explained 40% and 24% of total variation, respectively. In this experiment, two mega- environments were identified. The first mega-environment included Ahavaz and Darab, and the second mega-environment included Zabol, Gonbad and Moghan. Considering grain yield and yield stability stability estimates, line NO. 2 has been identified with wide adpatation and released for warm regions (north and south) and line NO. 3 with specific adaptaion for the north warm region of Iran.