تأثیر محلول پاشی اسید آسکوربیک بر خصوصیات فیزیولوژیک و اجزای عملکرد ذرت شیرین تحت رژیم های آبیاری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد، گروه زراعت و اصلاح نباتات، واحد ساوه، دانشگاه آزاد اسلامی، ساوه، ایران

2 باشگاه پژوهشگران جوان و نخبگان، واحد ساوه، دانشگاه آزاد اسلامی، ساوه، ایران

3 استادیار، گروه زراعت و اصلاح نباتات، واحد ساوه، دانشگاه آزاد اسلامی، ساوه، ایران

چکیده

به منظور بررسی تأثیر محلول­پاشی آسکوربیک اسید بر خصوصیات فنولوژیک و فیزیولوژیک ذرت شیرین تحت رژیم­های آبیاری، آزمایشی به صورت کرت­های خردشده در قالب طرح بلوک‌های کامل تصادفی با سه تکرار در هشتگرد و در سال 1393 انجام شد. تیمارهای مورد مطالعه شامل تنش خشکی در سه سطح (آبیاری کامل، تنش ملایم و تنش شدید) به­عنوان کرت اصلی و محلول‌پاشی اسید آسکوربیک در چهار سطح (شاهد، 40، 80 و 120 میلی­گرم در لیتر به­عنوان کرت فرعی بود. صفات مورد بررسی در این آزمایش شامل ارتفاع بوته، تعداد دانه در بلال، وزن هزار دانه، عملکرد دانه، کلروفیل کل، محتوای آب نسبی برگ پرولین و سوپراکسید دیسموتاز بود. نتایج نشان داد که تنش خشکی موجب کاهش ارتفاع بوته، تعداد دانه در بلال، وزن هزار دانه، عملکرد دانه، کلروفیل کل، محتوای آب نسبی برگ و افزایش پرولین و فعالیت آنزیم­های سوپراکسید دیسموتاز و کاتالاز شد، به­طوری که تحت شرایط تنش شدید خشکی، تعداد دانه در بلال، وزن هزار دانه و عملکرد دانه به ترتیب 03/43، 11/23 و 49 درصد کاهش پیدا کرد. در مقابل، محلول­پاشی اسید آسکوربیک موجب افزایش ارتفاع بوته، وزن هزار دانه، عملکرد دانه، کلروفیل کل، محتوای آب نسبی برگ و کاهش پرولین و فعالیت آنزیم­های سوپراکسید دیسموتاز و کاتالاز شد و بیشترین تأثیر مثبت در تیمار 120 میلی­گرم در لیتر اسید آسکوربیک مشاهده شد. همچنین محلول­پاشی با 120 میلی­گرم در لیتر اسید آسکوربیک موجب افزایش 1/32 درصدی عملکرد دانه شد.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of foliar application of ascorbic acid on yield components and physiologic character of sweet corn under different irrigation regims

نویسندگان [English]

  • Mohsen Asghari 1
  • Abolfazl Masoumi Zavariyan 2
  • Mojtaba Yousefi rad 3
1 Graduate M. Sc. Student, Dept. of Agronomy and Plant Breeding, Saveh Branch, Islamic Azad University, Saveh, Iran
2 Young Researchers and Elite Club, Saveh Branch, Islamic Azad University, Saveh, Iran
3 Assist. Prof., Dept. of Agronomy and Plant Breeding, Saveh Branch, Islamic Azad University, Saveh, Iran
چکیده [English]

To investigate the effect of ascorbic acid foliar application on phenological and physiological characteristics of sweet corn under water deficits, an experiment was carried out as split plots in randomized complete block design with three replications at Hashtgerd in 2014. Three levels of drought stress (complete irrigation, moderate and severe drought stress) were considered as main plots and four levels of ascorbic acid foliar application (control, 40, 80 and 120 mg.lit-1) as sub-plots. The studied characteristics were plant height, number of grain per ear, 1000-grain weight, grain yield, total chlorophyll, relative water content (RWC), proline and superoxide dismutase (SOD) activity. The results showed that drought stress decreased plant height, number of grain per ear, 1000-grain weight, grain yield, total chlorophyll, RWC and increased proline accumulation and SOD and catalase activities so that severe drought stress conditions decreased number of grain per ear, 1000-grain weight and grain yield about 43.03, 23.11 and 49%, respectively. In contrast, ascorbic acid foliar application increased plant height, 1000-grain weight, grain yield, total chlorophyll and RWC and reduced proline accumulation and SOD and catalase activities so that the most positive effect of ascorbic acid was observed in 120 mg.lit-1. Also, ascorbic acid foliar application with 120 mg.lit-1 increased grain yield about 32.1%.

کلیدواژه‌ها [English]

  • CAT
  • Chlorophyll
  • Proline
  • RWC
  • SOD
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