اثر تنش شوری بر جوانه‌زنی و رشد دو رقم آفتابگردان تاج‌خروس‌ خودروی در شرایط آزمایشگاهی و آبکشت

نوع مقاله: پژوهشی

نویسندگان

1 کارشناسی ارشد شناسایی و مبارزه با علف‌های هرز گروه علوم علف‌های هرز دانشکده علوم کشاورزی دانشگاه آزاد اسلامی واحد شیراز شیراز، ایران

2 استادیار گروه علوم علف‌های هرز دانشکده علوم کشاورزی دانشگاه آزاد اسلامی واحد شیراز شیراز، ایران

چکیده

اثر سطوح مختلف شوری بر جوانه‌زنی و رشد دو رقم آفتابگردان، رقم‌های یوروفلور و رکورد و  علف هرز تاج‌خروس ‌‌خودروی به صورت کرت‌های ‌خرد شده در قالب طرح کاملاً تصادفی در محیط آزمایشگاهی و نیز محیط آبکشت در دو آزمایش جداگانه انجام شد. در هر آزمایش کرت اصلی شامل نوع گیاه و کرت فرعی شامل سطوح شوری بود. در ظروف پتری سطوح شوری شامل صفر، 50 ، 100 ، 150 و 200 میلی مولار از کلرید سدیم بود. در هر ظرف پتری بذور آفتابگردان و تاج‌خروس خودروی ‌ به طور جداگانه قرار داده شده و 5 میلی‌لیتر محلول نمک افزوده شده و در دمای 30 درجه سلسیوس نگهداری شد. یک هفته بعد، جوانه‌زنی و شاخص‌های رشد اولیه اندازه‌گیری شد. با افزایش سطوح شوری، درصد جوانه‌زنی و پارامترهای رشد گیاهچه در دو رقم آفتابگردان و تاج‌خروس‌ خودروی به طور معنی‌داری کاهش یافت. در مرحله جوانه‌زنی تحمل به شوری تاج‌خروس‌ خودروی کمتر از آفتابگردان بود. در آزمایش دوم بذرها در ماسه کشت و پس از انتقال گیاه به محلول هوگلند، تیمارهای شوری شامل صفر، 25 ، 50 ، 100 و 150 میلی مولار از کلرید سدیم در محیط کشت اعمال گردید. شاخص‌های رشد و میزان کلروفیل پس از چهار هفته تعیین گردید. با افزایش سطوح شوری پارامترهای رشد و میزان کلروفیل برگ در ارقام آفتابگردان و تاج‌خروس ‌خودروی به طور معنی‌داری کاهش یافت. هم‌چنین تحمل به شوری رقم یوروفلور کمتر از رقم رکورد و تاج‌خروس‌ خودروی بود. در شرایط خاک‌های شور کشت رقم رکورد آفتابگردان پیشنهاد می‌گردد. 

کلیدواژه‌ها


عنوان مقاله [English]

Effect of salinity stress on germination and initial growth of two sunflower cultivars and red-root amaranth in in vitro and hydroponic condition

نویسندگان [English]

  • Fatemeh Tavakoli 1
  • Mansoureh Moeeni 2
1 Master of Weed Science Department ofWeed Science College of Agriculture Science Islamic Azad University Shiraz Branch Shiraz, Iran
2 Assistant professor Department ofWeed Science College of AgricultureScience Islamic Azad University Shiraz Branch Shiraz, Iran
چکیده [English]

The effect of salinity levels on germination and growth of sunflower (Helianthus annuus L.) cvs. Euroflor and Record and redroot pigweed (Amaranthus retroflexus L.) was studied in two separate experiments under laboratory and hydroponic conditions. The experiments were in split plot based on completely randomized design. Main plot and subplots were devoted for plant type and salinity level, respectively. The salinity levels were 0, 50, 100, 150, and 200 mM of sodium chloride in laboratory condition. The seeds were placed in each Petri dish separately and 5 ml of salt solution was added and were incubated at 30 °C. The germination and primary growth parameters were evaluated in one week. Increasing salinity levels, caused reduction of germination percentage and seedling growth parameters of sunflower cultivars and redroot pigweed, significantly. The redroot pigweed was less tolerant to salinity than sunflower cultivars in germination stage. In hydroponic condition, the seeds were sown in sand and after plant transferring to Hoagland solution, salinity treatments including 25, 50, 100, and 150 mM of sodium chloride were added to the culture medium. After 4 weeks, the growth parameters and leaf chlorophyll content were recorded. The growth parameters and leaf chlorophyll content were decreased significantly, increasing of salinity levels. In addition to the sunflower cv. Euroflor was less tolerant to salinity than Record and redroot pigweed. The sunflower cv. Record is recommending being cultivated in saline soils.

کلیدواژه‌ها [English]

  • Euroflor cultivar
  • hydroponic system
  • Hoagland solution
  • Record cultivar
  • weed
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