نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد اکولوژی گیاهان زراعی، دانشگاه زنجان، زنجان

2 استادیار گروه ژنتیک و تولید گیاهی، دانشگاه زنجان، دانشکده کشاورزی، زنجان

3 دانشجوی دکتری فیزیولوژی گیاهان زراعی، دانشگاه زنجان، زنجان

چکیده

کمبود آب به مشکلی جهانی تبدیل شده و باعث مشکلات بسیاری در بخش کشاورزی و تأمین غذا برای جمعیت رو به رشد جهان شده است به‌منظور بررسی اثر رژیم­های مختلف آبیاری و محلول‌پاشی هورمون متیل­ جاسمونات بر خصوصیات رشدی، فیزیولوژیکی و بیوشیمیایی ارقام جو، آزمایشی به‌صورت طرح اسپلیت اسپلیت‌پلات در قالب طرح بلوک­های کامل تصادفی در سه تکرار در مزرعه تحقیقاتی دانشکده کشاورزی دانشگاه زنجان در سال زراعی 1399-1400 انجام شد. در این آزمایش، رژیم­های آبیاری به‌عنوان اثر اصلی شامل آبیاری کامل (شاهد)، قطع آبیاری در مرحله گلدهی، قطع آبیاری در مرحله پر شدن دانه و دیم کامل، ارقام به‌عنوان اثر فرعی شامل رقم بهمن، سهند، جلگه، آبیدر و انصار و محلول­ پاشی متیل­ جاسمونات شامل بدون محلول ­پاشی (شاهد) و محلول ­پاشی 50 میکرومول بر لیتر متیل ­جاسمونات موردبررسی قرار گرفتند. نتایج مقایسات میانگین اثر متقابل سه ­گانه بین آبیاری و رقم و متیل­ جاسمونات در صفات کلروفیل a و کلروفیل کل ارقام جو قرارگرفته در معرض دیم در این صفات کاهش و در صفت پرولین در شرایط قطع آبیاری در مرحله گلدهی و پر شدن دانه و دیم افزایش مقدار پرولین را در مقایسه با آبیاری نرمال و نیز در شرایط دیم کاهش ارتفاع را در مقایسه با آبیاری نرمال نشان دادند. همچنین نتایج مقایسه میانگین اثر متقابل رقم و متیل­ جاسمونات در صفت عملکرد دانه نشان­دهنده این است که در ارقام بهمن، سهند، جلگه و آبیدر محلول ­پاشی شده با متیل­ جاسمونات عملکرد دانه را به ترتیب 17.7، 24.6، 8.3 و 22.3 درصد در مقایسه با تیمار بدون متیل­ جاسمونات به‌طور معنی­ داری افزایش داد ولی در رقم انصار یک افزایش غیر معنی­ دار (5.4 درصد) در عملکرد دانه حاصل شد. بیشترین عملکرد دانه (4762 کیلوگرم در هکتار) زمانی مشاهده شد که رقم جلگه تحت تیمار آبیاری کامل با 50 میکرومول بر لیتر متیل ­جاسمونات محلول­ پاشی شد و کمترین عملکرد دانه (432 کیلوگرم در هکتار) در رقم بهمن در شرایط دیم و بدون محلول­ پاشی ایجاد شد. به نظر می­رسد کاربرد متیل جاسمونات و آبیاری کامل به‌عنوان یک ابزار مناسب برای افزایش عملکرد دانه استفاده شود.

کلیدواژه‌ها

موضوعات

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