نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه زراعت، واحد ملکان، دانشگاه آزاد اسلامی، ملکان، ایران
2 موسسه تحقیقات کشاورزی دیم، سازمان تحقیقات، آموزش و ترویج کشاورزی، مراغه، ایران
3 گروه زراعت، واحد ملکان، دانشگاه آزاد اسلامی، ملکان، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Cold tolerant safflower genotypes may be used as alternative winter crop in cold drylands of Iran. 56 selected genotypes of local safflower were tested under controlled and field conditions during winter 2013 and 2014. Genotypes were tested for their withstand remaining frozen for various freezing temperatures and different times. Survival of fully acclimated seedlings was evaluated after remaining frozen for 12 hours to 20 hours at -3°C which continuously decreased -2 in each hour up to -19°C. Survival after 12 hours at -3°C ranged from 0 to 100% and after 20 hours ranged from 0 to 20%. Selected materials were irrigated and germinated during fall planting in order to expose for winter cold in the field trial. There was a large variability among accessions for freezing tolerance in both controled and field conditions. Lethal temperature for 50% of the plants (LT50) with temperatures ranging from –3 to –19°C. All selected genotypes were fully germinated in the autumn however, the percent of green stand during spring and after winter damage was observed between 1 to 90 percent. There was a negative correlastion between LT50 and percent of stands in the spring. 15 cold tolerant genotypes were selected for further investigations.
کلیدواژهها [English]