Effects of ascorbic acid on physiological and biochemical responses of Zinnia elegans L. to different levels of light intensity
Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

The aim of this study was to investigate the effect of different light intensities and ascorbic acid on some physiological and biochemical characteristics of Zinnia elegans L. The experiment was designed as a completely randomized design in a form of split-plot with three replications. The treatments were consisted of three light intensity levels (600, 1200 and 1800 μmol m-2 s-1) as the main factor using shade net and spraying three ascorbic acid concentrations weekly (0, 1, 2 mM) as sub-plots. Analysis of variance showed that light intensity had a significant effect on all studied traits, except for the guard cell width. As light intensity increased, proline content, catalase, and ascorbate peroxidase activity increased. The lower light intensity increased chlorophyll a and b, carotenoids, total chlorophyll, and peroxidase enzyme activity. Further, with increasing light intensity, stomatal density and index, and epidermal cells density increased, so that stomatal density of plants grown under 1800 μmol m-2 s-1 light intensity was twice of that under 600 μmol m-2 s-1 light intensity. Moreover, application of ascorbic acid increased ascorbate peroxidase enzyme activity, stomatal density, guard cell length, while, it reduced proline content, catalase and peroxidase enzyme activities. Overall, the results showed that increasing light intensity induced stress in Zinnia and weekly application of ascorbic acid alleviated the stress effects.

Language:
Persian
Published:
Journal of Plant Process and Function, Volume:9 Issue: 1, 2020
Pages:
259 to 273
magiran.com/p2122254  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 990,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
دسترسی سراسری کاربران دانشگاه پیام نور!
اعضای هیئت علمی و دانشجویان دانشگاه پیام نور در سراسر کشور، در صورت ثبت نام با ایمیل دانشگاهی، تا پایان فروردین ماه 1403 به مقالات سایت دسترسی خواهند داشت!
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 50 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!