ارزیابی تحمل به شوری تاج خروس (Amaranthus retrofelexus L.) در مرحله سبز شدن و گیاهچه ای تحت شرایط کنترل شده

نوع مقاله : علمی - پژوهشی

نویسندگان

چکیده

شوری از تنش‌های محیطی است که بر جوانه زنی، استقرار و رشد گیاهان تأثیر می‌گذارد. تعیین آستانه تحمل گیاه در شرایط تنش شوری برای سبز شدن و استقرار گیاهچه‌ها کمک زیادی در انتخاب خاک و آب آبیاری در کشت گیاهان هالوفیت می‌کند، به این منظور برای ارزیابی واکنش گیاه تاج خروس به تنش شوری و همچنین تعیین آستانه این گیاه در شرایط تنش شوری، آزمایشی در قالب طرح بلوک‌های کامل تصادفی با پنج تیمار و چهار تکرار در دو مرحله در اتاقک رشد اجراء شد. در مرحله اول سطح شوری صفر ، 10، 20،30 و 40 دسی زیمنس بر متر مورد مطالعه قرار گرفت. در این مرحله بذور تنها در سطوح شوری صفر و 10 دسی زیمنس بر متر قادر به سبز شدن بودند وبه ترتیب در صد سبز شدن بذور 90 و57 درصد بود. در مرحله دوم برای تعیین دقیق آستانه تحمل به شوری در این گیاه حد فاصل شوری 10 و 20 دسی زیمنس بر متر 12، 14، 16 و 18 مورد بررسی قرار گرفت. در این مرحله تا غلظت 14دسی زیمنس بر متر بذور قادر به سبز شدن بودند اما طول گیاهچه، وزن تر و خشک اندام هوایی و درصد ماده خشک کاهش یافت. بر اساس نتایج حاصله، آستانه سبز شدن گیاه تاج خروس در شرایط تنش شوری غلظت 14 دسی زیمنس بر متر تعیین گردید.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of salinity tolerance at emergence and seedling stages of Amaranthus retrofelexus L. under control environmental

نویسندگان [English]

  • Mohsen Zaferanieh
  • Jafar Valizadeh
  • S. Masoud Ziaie
  • Majid Jafari
  • Mahboubeh Mohseni
چکیده [English]

Salinity is one of the environmental factors that have a critical influence on the plant emergence and plant growth and establishment. The determination of salinity tolerance threshold is a useful criterion to choose soil and irrigation water for cultivation of halophytes. In order to determine salinity tolerance threshold in Amaranthus retrofelexus, an experiment was performed in greenhouse based on a complete randomized block design with four replications in two stages. In first stage, the experiment was performed with salinity levels of 0, 10, 20, 30 and 40 dsm-1 and emergence percentage in salinity levels of 0 and 10 dsm-1 was 90 and 57%, respectively. In order to determine the full – scale of salinity tolerance threshold Amaranthus retrofelexus, the second experiment was conducted. At this second stages, treatment were different levels of salinity equal to 10, 12, 14, 16 and 18 dsm-1 NaCl. Amaranthus retrofelexus seedling were able to emerge up to the salinity of 14 dsm-1 NaCl. Generally, with increasing the levels of salinity, the seedling emergence percentage was decreased. According to result, salinity tolerance threshold for seedling emergence and performance of Amaranthus retrofelexus under controlled condition was 14 dsm-1

کلیدواژه‌ها [English]

  • Tolerance threshold
  • Emergence percentage
  • Halophyte
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