تأثیر دارواش بر صفات روزنه، عدم تقارن و شاخص ویژة سطح برگ گونة انجیلی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه جنگلداری دانشگاه تربیت مدرس

2 کارشناس ارشد دانشکده منابع طبیعی دانشگاه تربیت مدرس

3 استاد دانشکده منابع طبیعی دانشگاه تربیت مدرس

چکیده

تحقیق حاضر به‌منظور کسب شواهدی مبنی بر تأثیر مخرب دارواش بر شاخص عدم تقارن و خصوصیات برگ درخت انجیلی در جنگل جلگه‌ای تمیشان نور انجام پذیرفت. برای این هدف، 20 پایه انجیلی در دو موقعیت داخل و خارج توده، در جنگل تمیشان نور انتخاب شد. صفات مساحت ویژة برگ، روزنه و شاخص عدم تقارن اندازه‌گیری شد. نتایج نشان داد که مساحت برگ و سطح ویژة برگ در هر دو موقعیت در شاخة درختان سالم بیشترین و در شاخه‌های سالم و آلوده درختان آلوده کمترین مقدار را نشان داد. خصوصیات روزنه نیز بسته به موقعیت قرارگیری درختان و نوع شاخه (سالم و آلوده) با یکدیگر متفاوت بود. آنالیز واریانس نشان داد که اثر جهت که بیانگر عدم تقارن جهت‌دار و اثر پایه که بیانگر تغییرات پایه‌هاست، معنی‌دار است. بررسی اختلاف اندازة دو نیمۀ چپ و راست برگ نشان داد این صفت تحت تأثیر معنی‌دار موقعیت قرارگیری درخت و نیز نوع شاخه است. به‌طور کلی نتایج این تحقیق نشان داد درختان انجیلی آلوده به دارواش واقع در حاشیة توده بیشترین تغییرات را در ریخت‌شناسی برگ خود ایجاد کردند. در پایان پیشنهاد می‌شود با توجه به ارزش تغذیه‌ای دارواش برای دام، به‌منظور‌ جلوگیری از خشک شدن درخت میزبان، با مدیریت متمرکز بر درختان با آلودگی بسیار زیاد، اقدام به برداشت و حذف دارواش از روی درخت انجیلی شود.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of Viscum album L. on stomatal characteristics, fluctuating asymmetry and specific leaf area of Parrotia persica

نویسندگان [English]

  • Hamed Yousefzadeh 1
  • Hura Momeni 2
  • Mohsen Hoseini 3
چکیده [English]

This study was conducted to investigate the devastating impact of Mistletoe (Viscum album L.) on asymmetry index and leaf characteristics of Ironwood (Parrotia persicaDC.) in Tamishan Forest, Noor, Iran. For this purpose, 20 Ironwood trees were selected inside and outside of the forest. The results showed that the highest and lowest values of leaf area and specific leaf area were observed in healthy and infected trees, respectively, both inside and outside of the forest. Stomatal characteristics of diameter, area and density also varied depending on location of trees and branch types (healthy or infected). Analysis of variance (ANOVA) indicated that the effect of left or right sides of leaves (sides) and trees were significant, while the interaction between side×trees was not significant. The difference between left and right sides of leaves were also significantly affected by location of trees and branches types.  Generally, this study showed that the presence of mistletoe influenced the asymmetry index and have been caused to changes in the morphology of the infected trees. Finally, due to nutrition importance of Viscum album for animal to prevent from death of host trees, mechanical removing of Viscum album from host trees with high density is recommended. 

کلیدواژه‌ها [English]

  • Parrotia persica
  • Stress
  • Host trees
  • asymmetry index
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