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اثر برازینواستروئید بر صفات مرفولوژیک و فیزیولوژیک آویشن باغی (Thymus vulgaris) تحت تنش شوری | ||
علوم و تحقیقات بذر ایران | ||
مقاله 6، دوره 8، شماره 1، فروردین 1400، صفحه 63-76 اصل مقاله (1.03 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22124/jms.2021.5203 | ||
نویسندگان | ||
علیرضا نوروزیشرف* ؛ مریم کاویانی؛ مهرداد رسولی | ||
استادیار گروه علوم و مهندسی باغبانی و فضای سبز دانشگاه سیدجمالالدین اسدآبادی، اسدآباد، ایران | ||
چکیده | ||
پژوهش حاضر با هدف کاهش اثرات تنش شوری بر جوانهزنی و مراحل اولیه رشد گیاه دارویی آویشن باغی با استفاده از کاربرد برازینواستروئید در شرایط کشت درونشیشهای انجام شد. بذرهای آویشن باغی در معرض تیمار شوری (صفر، 50، 100 و 200 میلیمولار) و برازینواستروئید (5/0، 1 و 3 میکرومولار) قرار گرفتند، و سپس شاخصهای گوناگون جوانهزنی و رشد و نیز برخی ویژگیهای فیتوشیمیایی در گیاهچهها اندازهگیری شدند. نتایج نشان داد که در شرایط شوری، بیشترین میزان درصد جوانهزنی (95 درصد) در پایینترین غلظت نمک (50 میلیمولار) و بالاترین غلظت برازینواستروئید (3 میکرومولار) مشاهده شد. کاربرد غلظتهای مختلف برازینواستروئید باعث بهبود ارتفاع ریشه و ساقه و نیز افزایش میزان وزن خشک و تر گیاهچههای آویشن باغی شد، بهطوریکه در شوری 200 میلیمولار، میزان طول ریشه و ساقه در نمونههای تیمارشده با 3 میکرومولار برازینواستروئید نسبت به نمونههای تیمارشده با 5/0 میکرومولار برازینواستروئید بهترتیب حدود 5/30 و 9/42 درصد افزایش یافتند. میزان پرولین و آنزیمهای آنتیاکسیدانت پراکسیداز (POD) و سوپراکسیددیسموتاز (SOD) در گیاهچههای تیمارشده با غلظت بالاتر برازینواستروئید نسبت به غلظتهای پایینتر بهطور معنیداری افزایش یافتند و این گیاهچهها نفوذپذیری غشای (پراکسیدهشدن لیپید) کمتری داشتند. نتایج ضریب همبستگی نشان داد که بین نفوذپذیری غشای یاخته (پراکسیدهشدن لیپید) و همه صفات بیوشیمیایی و مرفولوژیک اندازهگیریشده مربوط به رشد گیاهچه همبستگی منفی وجود دارد. بر اساس نتایج این پژوهش، کاربرد برازینواستروئید با غلظت 3 میکرومولار در مرحله حساس جوانهزنی بذر و رشد اولیه گیاهچههای آویشن باغی تحت تنش شوری پیشنهاد میشود. | ||
کلیدواژهها | ||
پراکسیداز؛ تنش شوری؛ نفوذپذیری غشا؛ کشت درونشیشهای | ||
مراجع | ||
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