بررسی اثر پیش تیمار بذر بر بهبود جوانه‌زنی و رشد گیاهچه قیچ (Zygophyllum atriplicoides)تحت تنش دما

نویسندگان

دانشگاه زابل

10.22052/6.15.1

چکیده

درجه حرارت مهمترین عامل محیطی در پراکنش گیاهان می‌باشد و مهمترین فاکتور تعیین کننده موفقیت در استقرار یا عدم موفقیت در استقرار گیاهچه می باشد. به‌منظور بررسی تاثیر محرک‌های شیمیایی بر جوانه‌زنی و رشد گیاهچه تحت تنش دما، آزمایشی بصورت فاکتوریل در قالب طرح کاملاً تصادفی با 4 تکرار در هر تیمار انجام شد. تیمار‌های پرایمینگ عبارت بودند از: سه سطح جیبرلیک اسید (125، 250، 500 ppm)، سه سطح سالسیلیک اسید (100، 200، 300 میلی‌گرم بر لیتر)، سه سطح اسکوربیک اسید (100، 200، 300 میلی‌گرم برلیتر) و همزمان از آب مقطر بعنوان شاهد استفاده شد و تیمار‌های تنش دما شامل 6 سطح درجه حرارت (5، 10، 15، 20، 25، 30 درجه سانتیگراد) بودند. نتایج نشان دادکه با افزایش دما خصوصیات جوانه‌زنی قیچ (درصد جوانه‌زنی، سرعت جوانه‌زنی، طول ریشه‌چه، طول ساقه‌چه، طول گیاهچه، شخص بنیه بذر) افزایش یافت و در دمای 25 درجه سانتیگراد به بیشترین مقدار خود رسید و با افزایش دما از مقدار 25 درجه سانتیگراد کاهش پیدا نمود. کلیه محرک‌های شیمیایی باعث افزایش خصوصیات جوانه‌زنی نسبت به تیمار شاهد گردیدند و در بین محرک‌های شیمیایی مورد استفاده بیشترین تاثیر را جیبرلیک اسید 250 ppm داشت که این غلظت اسید جهت تعدیل اثرگذاری‌های منفی تنش دما بر گیاه قیچ پیشنهاد می‌گردد.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of Seed Priming on Germination Improvement and Seedling Vigor in Zygophyllum Atriplicoides under Temperature Conditions Temprature Conditions  

نویسندگان [English]

  • shahnaz rafatpoor
  • alireza shahriari
چکیده [English]

Temperature is an important environmental factor in plant distribution and the most important factor in determining the success or failure of seedling establishment. The aim of this study was to investigate the effects of different levels of gibberellic, salicylic and ascorbic acid on improvement of germination indices of Zygophyllum atriplicoides under temperature stress in laboratory. Factorial test in the completely randomized design with four treatments was used for data analysis. Chemical stimulators used in this study include: 3 levels of gibberellic acid (125, 250 and 500 ppm), 3 levels of salicylic acid (100, 200 and 300 mg/l), 3 levels of salicylic acid (100, 200 and 300 mg/l) and 6 levels of temperature treatment (5, 10, 15, 20, 25, 30°C). The results showed that with increasing temperature, specifications for germination (germination percentage, speed of germination, root length, shoot length, seedling length, vigor or seed) also increased. When the temperature reached 25°C, the maximum amount of chemical stimulators is obtain and decreased with increasing temperature from 25 °C. All chemical stimuli increased germination compared to the control treatment. Chemical stimuli used in 250 ppm gibberellic acid was the most effective acid concentration to modulate the negative effects of temperature stress on Z. atriplicoides and is recommended.
 

کلیدواژه‌ها [English]

  • priming
  • Germination
  • Temperature
  • Zygophyllum atriplicoides.  
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