مطالعه رفتار روزنه ای دو رقم گل رز در شدت های مختلف نور

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد، گروه باغبانی، پردیس ابوریحان دانشگاه تهران، پاکدشت، تهران، ایران

2 استادیار، گروه باغبانی، پردیس ابوریحان دانشگاه تهران، پاکدشت، تهران، ایران

چکیده

نور از مهم‌ترین عوامل محیطی تأثیرگذار بر بسیاری از جنبه­های رشد و نمو گیاهان محسوب می­شود. برگ­های قرارگرفته در سایه و آفتاب به‌طور معمول تفاوت­هایی در بسیاری ویژگی­ها از جمله رفتار روزنه­ای نشان می­دهند. در این پژوهش، تأثیر شدت­های مختلف نور بر رفتار روزنه­ای دو رقم رز تحت شرایط گلخانه­ای بررسی شد. تیمارها شامل شدت­های نور 1200 (شاهد)، 640، 520 و 240 میکرومول بر متر مربع در ثانیه بودند که روی دو رقم تجاری رز (‘ردوان‌’ و ‘گلمیرا’) با استفاده از تورهای سبز رنگ اعمال شدند. براساس نتایج به‌دست‌آمده، طول و عرض روزنه در شدت نور 640 میکرومول بر متر مربع در ثانیه بیشترین بود و از این نظر، تفاوتی بین ارقام وجود نداشت. از نظر تراکم روزنه، تفاوت معناداری میان شدت­های مختلف نور مشاهده نشد، اما بین دو رقم رز از این نظر، اختلاف معناداری مشاهده شد، به­طوری­که رقم ‘گلمیرا’‌ تعداد روزنۀ بیشتری نسبت به رقم ‘ردوان‌’  داشت. اگرچه هدایت روزنه­ای تنها در بین دو رقم اختلاف معناداری در سطح 5 درصد نشان داد، مقایسۀ میانگین شدت­های مختلف نور تفاوت معناداری از این نظر نشان ندادند و تنها یک روند افزایشی با افزایش شدت نور به­دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Stomatal behavior of two rose cultivar under different light intensities

نویسندگان [English]

  • Mansoureh Hatamian 1
  • Mostafa Arab 2
  • Mahmoud Reza Roozban 2
1 Former M.Sc. Student, Department of Horticulture, College of Aburaihan, University of Tehran, Pakdasht, Tehran, Iran
2 Assistant Professor, Department of Horticulture, College of Aburaihan, University of Tehran, Pakdasht, Tehran, Iran
چکیده [English]

Light as an important environmental factor, influences many aspects of plant growth and development. Leaves are different in some characters including stomatal behavior under shade or light conditions. In this study, the effects of different levels of light intensity on stomatal behavior of two rose cultivars, ‘Gulmira’ and ‘Red One’, were evaluated under controlled conditions. To obtain different light intensities, green polyethylene nets were used. Treatments were light intensities of 1200 (Control), 640, 520 and 240 mmol/m2­­/s. Based on the results, the highest stomatal length and width were found in 640 mmol/m2­­/s in both cultivars. Regarding stomatal density, there were no significant differences among different levels of light intensities, although cultivar effect was significant. Therefore, stomatal density was higher in ‘Gulmira’ than ‘Red One’. Also, stomatal conductance was significant only between cultivars, and there was no significant difference among light treatments. However there was an increasing trend of stomatal conductance with increasing light intensities.

کلیدواژه‌ها [English]

  • Shading
  • Stomatal conductance
  • Stomatal density
  • Stomatal length
  • Stomatal width

 

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