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بررسی خصوصیات جوانه زنی بذر مینای پرکپه ناجوربرگ (Tanacetum polycephalum subsp. Heterophyllum) تحت تنش شوری و خشکی در دماهای مختلف | ||
| علوم و فناوری بذر ایران | ||
| مقاله 4، دوره 2، شماره 2 - شماره پیاپی 4، مهر 1392، صفحه 161-171 اصل مقاله (1.51 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| رضا توکل افشاری* 1؛ بهرام کاروانی2؛ ناصر مجنون حسینی3 | ||
| 1استاد دانشگاه تهران، پردیس کشاورزی و منابع طبیعی، گروه زراعت | ||
| 2دانشجوی کارشناسی ارشد دانشگاه تهران، پردیس کشاورزی و منابع طبیعی، گروه زراعت | ||
| 3استاد دانشگاه تهران، پردیس کشاورزی و منابع طبیعی | ||
| چکیده | ||
| به منظور ارزیابی پاسخ خصوصیات جوانه زنی گیاهچه مینای پرکپه ناجوربرگ به تنش خشکی و شوری در دماهای مختلف 7 آزمایش انجام گرفت. دماهای مورد استفاده در این آزمایش 7 سطح دما شامل 5، 10، 15، 20، 25، 30 و 35 درجه سانتی گراد بودند. در هر دما برای ایجاد تنش شوری و خشکی هفت سطح تنش شامل صفر، 2-، 4-، 6-، 8- ،10- و 12- بار کلرید سدیم و پلی اتیلن گلایکول ایجاد شد. نتایج نشان داد که با افزایش تنش شوری و خشکی به طور معنی داری از سرعت و درصــد جوانــه زنــی، طـول ریشه چه و ساقه چه کاسته شد. در تنش شوری در اکثر دماها بجز 20 و 25 درجه سانتی گراد جوانه زنی در 12- بار کلرید سدیم به صفر رسید اما در تنش خشکی در اکثر دماها بجز 20 و 25 درجه در 10- بار و در همه دماها در 12- بار پلی اتیلن گلایکول به صفر رسید. بیشترین درصد و سرعت جوانه زنی در تیمار شاهد ( صفر بار) در دمای 25 درجه سانتی گراد مشاهده شد. نتایج بدست آمده نشان داد که دمای 25 درجه دمای بهینه برای جوانه زنی بذر این گیاه بوده و آستانه تحمل آن 12- بار در تنش شوری و 10- بار در تنش خشکی در این دما می باشد. | ||
| کلیدواژه‌ها | ||
| مینای پرکپه؛ دما؛ جوانه زنی؛ تنش خشکی و شوری | ||
| عنوان مقاله [English] | ||
| The evaluation of germination parameters of Tanacetum polycephalum under simulated drought and salinity stress at different temperatures | ||
| چکیده [English] | ||
| In order to study germination characteristics of Tanacetum polycephalumin water and salinity stress conditions in different temperatures seven laboratories experimental were conducted. Temperatures regimes included 5, 10, 15, 20, 25, 30 and 45 °C. For each temperature, salinity and water stress was used in seven osmotic potential (0, -2, -4, -6, -8, -10 and -12 bar) of NaCl and PEG, respectively. Results of each experimental showed that increasing water and salinity stress decreased germination rate, germination percentage, plumule and radicle length, significantly. In salinity stress, germination percentage in most temperatures except 20 and 25°C in -12 bar of NaCl reached to 0, but in drought stress in most temperatures except 20 and 25°C -10 of PEG reached to 0. The maximum of germination percentage and germination rate was abserved in 0 bar in 25°C. Also maximum toleraance to salinity and drought stress was -12 and 10 bar of NaCl and PEG in 25°C, respectively. Results showed that 25°C is optimum temperature for this plant and it tolerates salinity stress up to -12 bar and water stress up to -10 bar at this temperature | ||
| کلیدواژه‌ها [English] | ||
| Tanacetum polycephalum, temperature, germination, water and salinity stress | ||
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