بررسی تغییرات میزان رنگیزه‌های فتوسنتزی، قندهای محلول، ترکیبات فلاونوئیدی و آنتوسیانینی در دو گیاه هالوفیت Salsola dendroides Pall. وLimonium reniforme (Girard) Lincz. در فصول مختلف

نوع مقاله: پژوهشی

نویسندگان

گروه زیست‌شناسی، واحد دامغان، دانشگاه آزاد اسلامی، دامغان، ایران

چکیده

در گیاهان مکانیسم‌های بیوشیمیایی و مولکولی متعددی برای مقابله با تنش شوری ایجاد شده است که‌ می‌توان به تغییر محتوای اسمولیت‌ها، افزایش میزان ترکیبات فنلی و حمایت از فعالیت فتوسنتزی اشاره کرد. این مکانیسم‌ها منجر به محصولات و فرایندهایی‌ می‌گردد که تحمل به شوری را بهبود‌ می‌بخشند. لذا نظر به اینکه کار تحقیقاتی قابل توجهی در زمینه مکانیسم‌های مقاومتی گونه‌های Salsola dendroides pall وLimonium reniforme (Girard)Lincz. انجام نشده است، برای پی بردن به مکانیسم فیزیولوژیکی بردباری این گیاهان تحت تنش اعمال شده به صورت طبیعی در فصول مختلف برخی از تغییرات فیزیولوژیکی گیاهان فوق مورد بررسی قرار گرفت. بدین منظور، گونه‌های مورد مطالعه از منطقه اینچه‌برون واقع در شمال گرگان به صورت کاملاً تصادفی با چهار تکرار در سه فصل بهار، تابستان و پاییز جمع‌آوری شدند. نتایج نشان داد که با افزایش دما و شوری در فصل تابستان محتوای رنگیز‌های کلروفیلی در هر دو گونه به صورت معنی‌داری کاهش یافت. میزان قند‌های محلول در اندام هوایی وریشه گیاه S. dendroides در فصل بهار نسبت به دو فصل دیگر و در گیاهL. reniformeدرفصل تابستان نسبت به فصل بهار افزایش معنی‌داری داشت. در تابستان نیز میزان ترکیبات فلاونوئیدی در اندام هوایی و ریشه گیاهان مورد مطالعه به صورت معنی‌داری در مقایسه با سایر فصول افزایش نشان داد. میزان آنتوسیانینی نیز به صورت معنی‌داری با تغییر فصل تغییر یافت، به‌طوری‌که بیشترین میزان تجمع آنتوسیانین‌ها در اندام هوایی و ریشه گیاه S. dendroides در فصل پاییز و در گیاه L. reniforme در فصل تابستان مشاهده شد که اغلب این تغییرات در ارتباط با فعالسازی فرایندهای فیزیولوژیکی و بیوشیمیایی که به گیاه امکان سازگاری تحت شرایط شوری را‌ می‌دهد.

کلیدواژه‌ها


عنوان مقاله [English]

A Study on variations in photosynthetic pigments, soluble sugars, flavonoid, and anthocyanin compont contents in two halophyte species (Salsola dendroides Pall. and Limonium reniforme (Girard) Linczin in different seasons

نویسندگان [English]

  • Sepideh Bakhshi
  • Hossein ABBASPOUR
  • Sakineh saeidisar
Department of Biology, Damghan Branch, Islamic Azad University, Damghan, Iran
چکیده [English]

Numerous biochemical and molecular mechanisms have been developed in plants to fight against salt stress namely, change in the content of osmolytes, enhancement of phenolic compounds, and supporting photosynthetic activity. These mechanisms lead to products and processes which improve the tolerance to salinity. Since there is no significant research on the resistance mechanisms of the species Salsola dendroides pall and Limonium reniforme (Girard) Lincz., some of these physiological changes in the aforementioned plants were investigated under natural stresses during different seasons  to study their tolerance mechanism. To this end, plants were randomly collected from Incheboron area, north of Gorgan with four replicates during spring, summer, and autumn. Results showed that with increased temperature and salinity in summer, chlorophyll pigment contents significantly decreased in both Salsola dendroides and Limonium reniforme species. Soluble sugars content significantly increased in shoots and roots of Salsola dendroides in spring compared with other seasons while soluble sugars content in Limonium reniforme was higher in summer in comparison with spring. In summer, flavonoid contents significantly increased in shoots and roots of both species compared with other seasons.  Anthocyanin content significantly changed with the change in seasons, while the highest anthocyanin contents were observed in shoots and roots of Salsola dendroides and Limonium reniforme in summer and autumn, respectively. Most of these changes were associated with activation of physiological and biochemical processes which allow the plants to adapt to saline conditions.

کلیدواژه‌ها [English]

  • halophyte
  • Salinity
  • Seasonal changes
  • Stress
  • Tolerance mechanism
 

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