Effect of Different Herbicides and Salicylic Acid Treatment on the Photosynthetic Efficiency of Corn Cultivars Using Chlorophyll a Fluorescence Transient Curve Analysis

Document Type : Research Paper

Authors

1 1Department of Agronomy and Plant Breading, University of Tehran, Karaj, Iran

2 Department of Agronomy and Plant Breading, University of Tehran, Karaj - Iran

3 Department of Agronomy and Plant Breading, University of Tehran, Karaj, Iran

4 Department of Plant Eco-Physiology, University of Tabriz, Tabriz - Iran

Abstract

Photosynthesis is an essential part of the plant function and metabolism and a number of herbicides inhibit certain photosynthetic activities. The aim of this study was to evaluate the effect of some herbicides including Topik, Titos, Equip, Mister, Lumax, Bromicide and Oltima on the photosynthetic efficiency of three corn cultivars (CC-260, 400, 704) in response to salicylic acid (SA) treatment via chlorophyll a fluorescence (ChlF) transient curve (OJIP) analysis. Result showed that Topik, Titos, Equip, Mister and Oltima herbicides had no effect on the ChlF. In contrast, Bromicide and Lumax changed the shape of the ChlF curve as I phase of the OJIP curve was lost and the fluorescence level in the J step was close to I stape. However, application of SA improved the shape of the OJIP curve similar to normal samples. SA application under Bromicide and Lumax treatments un-blocked the electron transfer between QA and QB of PSII. Our study clearly indicated that the effect of SA on the I-P part of the ChlF curve was more than other parts. Thus, the effect of SA on the PSI activity was more than that of PSII under these herbicide treatments.
 

Keywords

Article Title [Persian]

اثر علفکش‌های مختلف و تیمار با اسید سالیسیلیک روی کارآیی فتوسنتزی ارقام ذرت با استفاده از منحنی‌های فلورسانس کلروفیل a

Authors [Persian]

  • سهیلا پورحیدر غفار بی 1
  • حمید رحیمیان مشهدی 2
  • حسن علیزاده 3
  • سیروس حسن نژاد 4
1 گروه زراعت و اصلاح‌نباتات، دانشگاه تهران
2 گروه زراعت و اصلاح‌نباتات، دانشگاه تهران
3 گروه زراعت و اصلاح‌نباتات، دانشگاه تهران
4 گروه اکوفیزیولوژی گیاهی دانشگاه تبریز، تبریز، ایران
Abstract [Persian]

فتوسنتز بخش ضروری در کارکرد و متابولیسم گیاه است و تعدادی از علفکش­ها مانع برخی فعالیت­های فتوسنتزی می­شوند. هدف اصلی از این آزمایش، ارزیابی اثر برخی علفکش­ها مانند تاپیک، تیتوس، اکوئیپ، مایستر، لوماکس، برومایسید و اولتیما روی کارایی فتوسنتزی سه رقم ذرت (260، 400، 704) در پاسخ به تیمار اسید سالیسیلیک از نظر منحنی­های فلورسانس کلروفیل a (OJIP) بود. نتایج نشان داد که علفکش­های تاپیک، تیتوس، اکوئیپ، مایستر و اولتیما اثری روی فلورسانس کلروفیل ندارند. در مقابل، برومایسید و لوماکس منحنی­های OJIP را در مرحله  I تغییر دادند، به طوری که فلورسانس کلروفیل در مرحله I حذف شد و سطح فلورسانس در مرحله J مشابه با مرحله I بود. در حالی­که، کاربرد اسید سالیسیلیک شکل منحنی­های OJIP را بهبود بخشید و به حالت عادی رساند. کاربرد اسید سالیسیلیک تحت تیمار علفکش­های برومایسید و لوماکس منجر به غیر بلوکه شدن انتقال الکترون از کوئینون a (QA) به کوئینون b (QB) در فتوسیستم II شد. این مطالعه به روشنی مشخص کرد که اثر اسید سالیسیلیک روی مرحله I-P از منحنی فلورسانس کلروفیل بیشتر از مراحل دیگر است. بنابراین، اثر اسید سالیسیلیک روی فعالیت فتوسیستم I بیش از فتوسیستم II تحت کاربرد این علف کش­ها بود.

Keywords [Persian]

  • اسید سالیسیلیک
  • تجزیهJIP
  • ذرت
  • علفکش
  • فلورسانس کلروفیلa

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Journal of Plant Physiology and Breeding
Volume 7, Issue 2
December 2017
Pages 31-40

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