کمی سازی پاسخ جوانه‌زنی شوید (Anethum graveolens L.) به دما و تنش خشکی توسط مدل زمان حرارتی-رطوبتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 هیات علمی دانشکده کشاورزی، مجتمع آموزش عالی تربت جام

2 دانشکده کشاورزی، مجتمع آموزش عالی تربت جام، خراسان رضوی ایران

چکیده

دما و‎ ‎رطوبت‎ ‎از‎ ‎مهمترین‎ ‎عوامل‎ ‎محیطی‎ ‎کنترل کننده‎ ‎جوانه‌زنی در‎ ‎گیاهان می‌باشند. به‎ ‎منظور‎ ‎بررسی‎ ‎تأثیر‎ ‎دما و ‏تنش خشکی‎ ‎بر‎ ‎جوانه‌زنی‎ ‎بذر‎ ‎شوید و کمی سازی آن،‎ ‎آزمایشی‎ ‎به‎ ‎صورت‎ ‎فاکتوریل‎ ‎با‎ ‎هشت‎ ‎سطح‎ ‎دما شامل‎ ‎‏5، 10، ‏‏15، 20، 25، 30، 35 و 40‏‎ ‎درجۀ‎ ‎سلسیوس‎ ‎و‎ ‎هفت‎ ‎سطح‎ ‎تنش‎ ‎خشکی‎ ‎شامل‎ ‎‏0، 1/0-، 2/0-، 3/0-، 4/0-، 5/0- و ‏‏6/0- مگاپاسکال انجام‎ ‎شد‎.‎‏ نتایج نشان داد در‎ ‎همۀ‎ ‎سطوح‎ ‎دمایی‎ ‎با‎ ‎کاهش‎ ‎پتانسیل‎ ‎اسمزی، میزان جوانه‌زنی‎ ‎کاهش‎ ‎یافت، با این‌وجود شدت این کاهش در محدوده حرارتی 20 تا30 درجه سانتی‌گرداد کمتر بود. با دو روش مختلف، ‏درجه حرارت پایه جوانه‌زنی شوید 3/2 و 9/2 درجه ساتیگراد و درجه حرارت حداکثر جوانه‌زنی آن 0/ 43و 3/47 ‏درجه سانتی برآورد شد. دمای مطلوب جوانه‌زنی برای شوید نیز حدود 26 درجه سانتی‌گراد به دست آمد. مقدار ‏پتانسیل آب پایه برای جوانه‌زنی شوید در مدل زمان حرارتی-رطوبتی نیز 53/0- مگاپاسکال محاسبه شد. نتایج ‏همچنین نشان داد که با افزایش حرارت پتانسیل آب پایه برای جوانه‌زنی بذر شوید در حد نیم واحد مگاپاسکال ‏افزایش یافت. در نهایت مشخص شد که در صورت متغییر در نظر گرفتن پتانسیل آب پایه در واکنش به تغییرات دما، ‏مدل زمان حرارتی-رطوبتی به‌خوبی قادر است پاسخ جوانه‌زنی شوید به حرارت و رطوبت را کمی کند.‏

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Quantifying of germination response in dill (Anethum graveolens L.) to temperature and drought stress by hydrothermal time model

نویسندگان [English]

  • Seyyed Farhad Saberali 1
  • Mohammad Naser Mododi 2
1 Agricultural faculty, High educational complex of Torbat-e Jam
2 Agriculture faculty , High Educational Complex of Torbat-e Jam, khorasan Razavi, Iran
چکیده [English]

Temperature and water are the most important environmental factors controlling seed germination in ‎plants. In order to investigate the effect of temperature and drought stress on seed germination and ‎quantifying of germination; a factorial experiment was conducted with eight temperature levels including ‎‎5, 10, 15, 20, 25, 30, 35 and 40 degrees Celsius and the seven levels of drought stress including 0, 0.5-‎‎0.0, -0.2, -0.3, -0.4, -0.5 and -0.6 MPa, respectively. The results showed that the germination was ‎decreased by decreasing osmotic potential at all temperature levels. However, the intensity of this ‎decrease was less in the range of 20 to 30°C. Using two different methods, the base and maximum ‎temperature of dill germination was estimated in the range of 2.3 and 2.9 °C and 43.0 and 47.3 °C, ‎respectively. The optimum temperature for dill germination was 26 °C. The estimated value of base ‎water potential for germination was -0.53 Mpa with the hydrothermal time model. The results also ‎showed that water base potential for dill germination was increased by -0.5 Mpa as temperature ‎increased. Finally, it was found that if the base water potential taking into account variable in response to ‎changing temperature, then the hydrothermal time model can be good enough to quntify dill germination ‎response to temperature and water.‎

کلیدواژه‌ها [English]

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  • Medicinal plant
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