نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری زراعت-فیزیولوژی گیاهان زراعی، گروه مهندسی تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه زنجان، زنجان

2 استادیار زراعت-فیزیولوژی گیاهان زراعی، گروه مهندسی تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه زنجان، زنجان

3 دانشیار بیولوژی و بیوتکنولوژی خاک، گروه علوم خاک، دانشکده کشاورزی، دانشگاه شیراز، شیراز

4 دانشیار زراعت-فیزیولوژی گیاهان زراعی، گروه مهندسی تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه زنجان، زنجان

چکیده

به منظور بررسی اثر پوترسین بر رشد و تحمل به سرب گیاه بالنگوی شهری (Lallemantia iberica)، آزمایشی فاکتوریل در قالب طرح بلوک‌های کامل تصادفی با شش تکرار (سه تکرار برای عملکرد دانه و سه تکرار برای صفات محتوی پرولین، شاخص سبزینگی، سطح برگ، وزن خشک ریشه، برگ، ساقه، کپسول و اندام هوایی، طول ریشه و شاخص تحمل) در گلخانه تحقیقاتی دانشکده کشاورزی دانشگاه زنجان در سال 1396 انجام شد. تیمارهای آزمایش عبارت بودند از: سرب در چهار سطح (0، 300، 600 و 900 میلی‌گرم بر کیلوگرم خاک از منبع نیترات سرب) و پوترسین در دو سطح (0 و 0.5 میلی‌مولار). نتایج نشان داد که سرب به ویژه غلظت 900 میلی‌گرم بر کیلوگرم، سطح برگ، شاخص سبزینگی، وزن خشک ریشه، برگ، ساقه، کپسول و کل اندام هوایی، طول ریشه، شاخص تحمل و عملکرد دانه را کاهش و محتوی پرولین را افزایش داد. محلول-پاشی پوترسین باعث بهبود صفات فوق به ویژه تحت تنش سرب شد، به طوری که کاربرد آن عملکرد دانه و شاخص تحمل را در سطح 900 میلی‌گرم سرب بر کیلوگرم خاک به ترتیب 65.95 و 74.2 درصد نسبت به عدم کاربرد آن افزایش داد. پوترسین طول ریشه، شاخص سبزینگی و وزن خشک برگ را در سطوح مختلف سرب افزایش داد و با توجه به همبستگی مثبت و بالا بین این صفات و شاخص تحمل، باعث افزایش شاخص تحمل در سطوح سرب نیز شد. بنابراین محلول‌پاشی پوترسین می‌تواند به عنوان راه‌کاری مناسب برای بهبود تحمل به سرب، رشد و عملکرد دانه بالنگوی شهری تحت تنش سرب استفاده شود.

کلیدواژه‌ها

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