نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجو دکتری علوم باغبانی، دانشکده کشاورزی، دانشگاه فردوسی مشهد

2 استادیار بخش علوم باغبانی، دانشکده کشاورزی، دانشگاه فردوسی مشهد

3 دانشیار بخش علوم باغبانی، دانشکده کشاورزی، دانشگاه فردوسی مشهد

4 استاد بخش زراعت، دانشکده کشاورزی، دانشگاه فردوسی مشهد

چکیده

فلفل شیرین از مناطق گرمسیری منشأ می‌­گیرد و حساس به سرما است؛ بنابراین شناخت مکانیسم دفاعی گیاه فلفل در مقابل دمای کم ضروری است. در این مطالعه اثر محلول‌پاشی سالیسیلیک‌ اسید و کود آلی ورمی کمپوست روی ارقام مختلف فلفل شیرین تحت تنش سرما موردبررسی قرار گرفت. آزمایش به­صورت اسپیلیت‌پلات فاکتوریل در قالب طرح بلوک‌های کامل تصادفی در سه تکرار در سال زراعی 97- 1396 در محیط گلخانه‌ای واقع در مشهد اجرا شد. عامل اصلی تیمار دمایی در دو سطح {دماهای 2± 9 درجه سلسیوس (تنش سرما) و 2±23 درجه سلسیوس (شاهد)} و عامل فرعی شامل دو رقم فلفل شیرین {California wonder (سبز)، Roxcy (زرد)}، سالیسیلیک اسید (صفر-200-300 میکرومول) و ورمی کمپوست (20 درصد حجمی) بود. نتایج نشان داد که تنش سرما باعث تغییرات برخی خصوصیات فیزیولوژیک و کاهش عملکرد میوه گردید. حداکثر درصد ماده خشک (17.2%) و اسیدیته قابل تیتراسیون (13.6%) در تیمار عدم تنش سرمایی و مواد جامد محلول (03/5 بریکس)، کربوهیدرات‌ها (mg.g-1 174.5) و فعالیت آنتی‌اکسیدانی (90.3%) در تیمار تنش سرمایی حاصل گردید. بیشترین عملکرد میوه در بوته (740 گرم در بوته) در تیمار تأثیر متقابل عدم تنش سرمایی و محلول‌پاشی سالیسیلیک‌ اسید μmol 300 به دست آمد. بیشترین مقدار فلاونوئید (mg.100g-1 FW 159.4) در تیمار سالیسیلیک‌ اسید μmol 200 حاصل شد. همچنین بیشترین مقدار بتاکاروتن (mg kg-1 346.4)، لیکوپن (mg kg-1 152.9) و ویتامین ث (mg.100 g-1 142.52) در تیمار سالیسیلیک اسید μmol 300 مشاهده شد. با توجه به نتایج می‌توان اظهار داشت تنش‌های سرمایی تأثیرات نامطلوبی بر شاخص‌های کیفی و عملکرد فلفل شیرین در محیط گلخانه می‌گذارد و کاربرد محلول‌پاشی سالیسیلیک‌ اسید در بعضی از صفات اثرات سوء تنش سرما را تعدیل کرد.

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