ارزیابی تحمل به یخ‌زدگی در ارقام گلرنگ (Carthamus tinctorius L.) تحت شرایط کنترل شده

نوع مقاله : علمی - پژوهشی

نویسندگان

چکیده

این تحقیق به منظور بررسی اثر تنش یخ‌زدگی بر ارقام گلرنگ (Carthamus tinctorius L.) در قالب آزمایش فاکتوریل بر پایه طرح کاملاً تصادفی با سه تکرار به اجراء درآمد. فاکتورهای آزمایش عبارت بودند از رقم (شامل پنج رقم پاییزه با نام‌های K.W. 3، K.W. 6، K.W. 16، زرقان 279 و لاین 295 و رقم بهاره-پاییزه IL-111) و دماهای یخ‌زدگی (شامل شش دمای صفر، 4-، 8-، 12-، 16- و 20- درجه سانتی گراد). کاشت در اوایل پاییز انجام و به منظور ایجاد خوسرمایی، گیاهان تا مرحله 7-5 برگی در شرایط آب و هوایی طبیعی رشد یافته و پس از آن تیمارهای یخ‌زدگی در شرایط کنترل شده بر روی آنها اعمال شد. سپس گلدان‌ها به محیط طبیعی منتقل شده و پس از سه هفته درصد بقاء و بازیافت (رشد مجدد) گیاهان ارزیابی گردید. نتایج نشان داد که درصد بقاء ارقام تفاوت معنی‌داری با یکدیگر نداشتند. مقدار LT50 برای ارقام مختلف بین 13- تا 5/13- درجه سانتی گراد بود. بررسی بازیافت بوته‌ها سه هفته پس از تیمار یخزدگی نشان داد که وزن خشک ارقام گلرنگ تفاوت معنی‌داری داشت و کمترین میزان وزن خشک را رقم IL-111 دارا بود. همچنین با کاهش دما به 12- درجه سانتی گراد وزن خشک ارقام کاهش یافت. از نظر LT50و دمای کاهنده 50 درصد وزن خشک گیاهان (RDMT50) نیز کمترین مقدار مربوط به لاین 295 و رقم IL-111 بود که این امر می‌تواند نشان دهنده بازیافت ضعیف‌تر این دو رقم نسبت به سایر ارقام باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of freezing tolerance in safflower (Carthamus tinctorius L.) genotypes under controlled conditions

نویسندگان [English]

  • A Nezami
  • Z Boroumand Rezazadeh
چکیده [English]

In order to evaluate the effect of freezing stress on safflower (Carthamus tinctorius L.) genotypes, an experiment was conducted in Faculty of Agriculture, Ferdowsi University of Mashhad, Iran. Treatments included 6 genotypes (K.W.3, K.W.6, K.W.16, Zarghan 279, Line 295 and IL-111) and freezing temperatures (0, -4, -8, -12, -16 and -20 ˚C). The trial was arranged as factorial based on completely randomized design with three replications. Plants were grown in small pots in natural environment till 5-7 leaf stage and then transferred to controlled conditions and freezing stress were imposed. Survival percentage, plant height, number of nodes per stem, length of internodes, leaf number and area, stem, leaf and plant dry weight were determined after three weeks (end of recovery). Results indicated that there was no difference between genotypes in survival percentage and lethal temperature 50 (LT50) was between -13 to -13.5˚C. Recovery of plants showed that the dry matter of safflower genotypes was significantly different and the lowest was belonging to IL-111 genotype. The lowest LT50 and Reduced Dry Matter Temperature 50 (RDMT50) was belong to the Line 295 and IL-111 showing the recovery weakness of these two genotypes compared to others.

کلیدواژه‌ها [English]

  • LT50
  • RDMT50
  • Recovery
  • Survival percentage
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