بررسی ژنوتیپ های گندم نان در آزمایش های مقایسه عملکرد پیشرفته برای اقلیم سرد و خشک در شرایط آبیاری محدود (پروژه خشکی)

‭Terminal drought stress is one of the limiting factors of wheat production in cold regions of Iran. Selection and introduction of terminal drought tolerant cultivars is one of the major goals of wheat breeding program for cold dry areas of Iran. Considering the importance of terminal drought stress and shortage of water at terminal growth stage of wheat cultivars, different types of yield trails are conducted under optimum and limited water conditions to identify and introduce cultivars which have the ability to produce expected high grain yield under limited water conditions. The objective of this study was to select terminal drought tolerant wheat lines with high grain yield and good adaptability in Advanced Regional Wheat Yield Trial (ARWYT) under limited water conditions in cold regions. This study was conducted in two series of experiments as follows: I-Advanced Regional Wheat Yield Trial-DI (RWYT-DI) were conducted with lOO wheat lines including two checks (Toos and Cross Shahi) in using alpha lattice design with 3 replications under late season limited water conditions in 4 experimental stations (Ardabil, Hamedan, Miandoab and Mashad) in 2005-2006 cropping seasons. Trials were irrigated by just the heading stage. 2- Advanced Regional Wheat Yiel4- Trial-D2 (RWYT-D2): These series of experiments were conducted with 80 wheat lines including checks using alpha lattice design with 3 replicates under late season limited water conditions at the same above mentioned station. During cropping seasons, morpho-physiological and agronomical characters associated with drought tolerance such as plant height, growth habit, 1000 kernel weight, no of days to heading and maturity, and grain yield were recorded. Comparisons of grain yield of new lines in ARWYT trials in each station and determination of their yield stability was carried out using non-parametric ranking statistic method (rank method). Based on results, most new lines were superior to the check cultivars in both series of the experiments. However, considering both the recorded data, and the grain yield of wheat lines under limited water conditions, 18 superior lines were selected from both series of the experiments. These selected lines will be assessed for their adaptability and yield stability under terminal drought stress conditons in next year's cropping season. ض‬

Keywords:

اردبیل , همدان , میاندوآب , مشهد , رقم طوس , رقم کراس شاهی , ژنوتیپ گندم , گندم نان , مقایسه عملکرد , مناطق سرد , مناطق خشک , آبیاری