Improving physiological performance and grain yield of maize by salicylic acid treatment under drought stress

Document Type : Research Paper


Department of Plant Eco-Physiology, Faculty of Agriculture, University of Tabriz, Tabriz, Iran


A field experiment was conducted as a split-plot based on a randomized complete block design with three replications in 2020 to investigate the effect of different salicylic acid (SA) levels on physiological traits and grain, oil, and protein yields of maize (MV 524). The irrigation treatments were normal irrigation (irrigation after 60 mm evaporation), and irrigation disruptions from tassel emergence up to seed formation and from tassel emergence up to harvest maturity. The plants were sprayed with three levels of SA (1, 2, and 3 mM) and water at the tassel emergence stage. The irrigation and SA treatments were assigned to the main and subplots, respectively. Irrigation disruption at reproductive stages caused a decline in mean leaf water content (LWC), membrane stability index (MSI), chlorophyll content, leaf area index (LAI), grain yield, oil percentage, oil and protein yields, and an increment in leaf temperature and protein percentage, compared to normal irrigation. Application of SA, especially with 3 mM concentration, increased mean LWC, MSI, chlorophyll content, LAI, and grain, oil, and protein yields of maize. The highest positive correlation with grain, oil, and protein yields was recorded for LAI, followed by LWC and chlorophyll content index. These results suggest that water supply at reproductive stages is essential for successful maize production. Nevertheless, a foliar spray of 3 mM SA can improve the field performance and productivity of maize under normal and limited water availability.


Main Subjects

Article Title [فارسی]

بهبود عملکرد فیزیولوژیکی و محصول دانه ذرت با تیمار سالیسیلیک اسید تحت تنش خشکی

Authors [فارسی]

  • کاظم قاسمی گلعذانی
  • سید امیر رضا موسوی
گروه اکوفیزیولوژی گیاهی، دانشکده کشاورزی، دانشگاه تبریز، تبریز
Abstract [فارسی]

یک آزمایش مزرعه ­ای به‌صورت طرح کرت‌های خرد شده بر پایه بلوک‌های کامل تصادفی با سه تکرار در سال 1399 اجرا گردید تا اثر سطوح مختلف سالیسیلیک اسید (SA) بر صفات فیزیولوژیکی و محصول دانه، روغن و پروتئین ذرت (MV 524) مورد بررسی قرار گیرد. تیمارهای آبیاری شامل آبیاری معمول (آبیاری پس از 60 میلی­ متر تبخیر) و قطع آبیاری از ظهور تاسل تا تشکیل دانه و از ظهور تاسل تا رسیدگی بودند. گیاهان با سه سطح SA (2، 1 و 3 میلی ­مولار) و آب­ تیمار شدند. تیمارهای آبیاری و SA به ترتیب در کرت­ های اصلی و فرعی قرار گرفتند. قطع آبیاری در مراحل زایشی سبب کاهش میانگین محتوای آب برگ (LWC)، شاخص پایداری غشا (MSI)، شاخص کلروفیل، شاخص سطح برگ (LAI)، محصول دانه، درصد روغن، محصول روغن و پروتئین و افزایش دمای برگ و درصد پروتئین دانه در مقایسه با آبیاری معمول شد. کاربرد SA، به ویژه با غلظت 3 میلی­ مولار، میانگین LWC، MSI، شاخص کلروفیل، شاخص سطح برگ و محصول دانه، روغن و پروتئین ذرت را افزایش داد. بیشترین همبستگی مثبت با محصول دانه، روغن و پروتئین مربوط به شاخص سطح برگ و پس از آن LWC و شاخص محتوای کلروفیل بود. این نتایج نشان می ­دهد که تأمین آب در مراحل زایشی برای تولید موفق ذرت ضروری است. با وجود این، محلول­  پاشی 3 میلی مولار SA می ­تواند عملکرد مزرعه­ ای ذرت را تحت فراهمی معمول و محدود آب به­ طور قابل توجهی بهبود بخشد.

Keywords [فارسی]

  • تنش خشکی
  • تنظیم کننده رشد
  • ذرت
  • روغن دانه
  • کلروفیل
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