پتانسیل مقاومت به استرس غرقابی در ژرم پلاسم گلابی وحشی (Pyrus boisseriana Buhse.)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار گروه جنگل‌داری، دانشگاه گنبد کاووس، گنبد کاووس، ایران

2 دانشجوی دکتری جنگل‌داری، دانشکدة منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران

3 دکتری جنگل‌داری، دانشکدة منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران

4 دانشیار گروه جنگل‌داری، دانشکدة منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران

5 کارشناس ‏ارشد جنگل‌داری، دانشکدة منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران

چکیده

ژرم‌پلاسم وحشی گونه‏های گیاهی به‌واسطة اکتساب سازگاری در سطح ژن تا خصوصیات ظاهری، سازگاری مقبولی به انواع تنش‏های محیطی نشان می‏دهند که استفاده از آن‌ها در جنگل‌کاری‏ها، کشاورزی، و باغداری مورد توجه قرار می‌گیرد. در این پژوهش، با تکیه بر مطالعة زنده‏‏مانی، رشد، زیست‏توده، و تغییرات فیزیولوژیکی نهال‏های گلابی وحشی، پتانسیل این گونه، به‌عنوان پایک در باغ‏هایی که به‌طور متناوب تحت تأثیر شرایط غرقابی قرار می‏گیرند، بررسی شد. بدین‌ترتیب نهال‏های گلابی در طرحی کاملاً تصادفی و دو سطح غرقابی (15 روز غرقاب و به دنبال آن 15 روز زهکشی) و شاهد به مدت 30 روز بررسی شدند. نتایج نشان داد که غرقابی باعث کاهش زنده‏مانی و رویش قطری و ارتفاعی نهال‏ها شده است. همچنین مشخص شد که غرقابی پس از 7 روز باعث کاهش شدید پارامترهای فیزیولوژیک از جمله هدایت روزنه‏ای، فتوسنتز، و میزان تعرق شده است و این روند کاهشی تا 15 روز بعد از شرایط غرقاب ادامه داشت تا اینکه بعد از زهکشی، مشخصه‏های فیزیولوژی شروع به بازیابی کردند. همچنین غرقابی باعث کاهش زیست‏تودة قسمت‏های گوناگون نهال شده است. ثبت مقادیر ناچیز پارامترهای فتوسنتز در روز پانزدهم از تنش، حاکی از آن است که ژرم‌پلاسم وحشی گلابی می‏تواند در باغ‌هایی که به‏طور متناوب 15 روز تحت شرایط غرقاب هستند مورد توجه قرار بگیرد. در صورت ادامة شرایط غرقاب بیش از 15 روز مرگ گیاه حتمی است.

کلیدواژه‌ها

عنوان مقاله [English]

Potential of Tolerance in Germplasm of Wild Pear under Flooding Stress

نویسندگان [English]

  • ali Sattarian 1
  • Ghasemali Parad 2
  • Mehrdad Zarafshar 3
  • Moslem Akbarinia 4
  • seyed farid Ghafari 5
1 Associate Professor, Department of Forestry, Gonbad Kavoos University, Gonbad Kavoos, I.R. Iran
2 PhD Candidate, Faculty of Natural Resources, Tarbiat Modares University, Noor, I.R. Iran
3 PhD, Faculty of Natural Resources, Tarbiat Modares University Noor, I.R. Iran
4 Associate Professor, Faculty of Natural Resources, Tarbiat Modares University Noor, I.R. Iran
5 M.Sc, Faculty of Natural Resources, Tarbiat Modares University Noor, I.R. Iran
چکیده [English]

Wild plant germplasm possesses useful adaptive strategies. Wild plant species, for example, are resistant to biotic and abiotic stress and can be used for reforestation, agriculture, and horticulture. We surveyed the potential of wild pear to resist flooding. We looked at survival, growth, biomass, and several physiological variables. The rootstocks of wild pear are candidates for planting in orchards that experience periodic flooding. For this purpose, we conducted a completely randomized design with two flooding treatments: 1. 15 days flooding plus 15 days recovery and 2. control, for a 30 day experimental period. The results showed no discernible effects of flooding on survival, height, and diameter. Nevertheless, seven days of flooding had negative and extensive effects on photosynthesis, transpiration, and stomatal conductance. This trend continued until the fifteenth day. Photosynthesis, however, recovered 15 days after the flooding. In addition, plant biomass was negatively affected by flooding. Cessation of photosynthesis after 15 days of flooding proves that the wild pear can be used as rootstock in areas prone to flooding for up to 15 days. If the flooding continues, however, the plant will eventually die.

کلیدواژه‌ها [English]

  • Biomass
  • Height growth
  • photosynthesis
  • Stomatal conductance
  • Vitality

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