مطالعه شاخص‌های جوانه‌زنی بذر و صفات مورفوفیزیولوژیک گل جعفری (Tagetes erecta Antigua orange) در کیفیت‌های مختلف نور LED LED

علوم باغبانی

مقاله 10، دوره 39، شماره 1 - شماره پیاپی 65، فروردین 1404، صفحه 172-155   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jhs.2024.89366.1370

نویسندگان

رسول عباس زاده فاروجی¹؛ عبدالله حاتم زاده^{* 1}؛ احمد شریفی²؛ سیده مهدیه خرازی²

¹گروه باغبانی، دانشکده کشاورزی، دانشگاه گیلان، رشت، ایران

²گروه بیوتکنولوژی گیاهان باغبانی، پژوهشکده بیوتکنولوژی صنعتی، سازمان جهاد دانشگاهی خراسان رضوی، مشهد، ایران

چکیده

به‌منظور مطالعه شاخص‌های مورفوفیزیولوژیک و جوانه‌زنی بذر گل جعفری (Tagetes erecta Antigua orange) در پاسخ به کیفیت‌های مختلف نور LED تحقیق حاضر در گروه بیوتکنولوژی علوم باغبانی جهاد دانشگاهی خراسان رضوی انجام شد. تیمارهای آزمایش شامل پنج کیفیت نور سفید (100%)، نور آبی (100%)، نور قرمز (100%)، 30% نور آبی + 70 % نور قرمز و 70% نور آبی + 30% نور قرمز بود. در ابتدا شاخص‌های جوانه زنی بذر در ظروف پتری دیش در زیر پنل‌های نوری اندازه گیری گردید و پس از کاشت بذرها در زیر پنل‌های نوری، شاخص‌های فیزیولوژیک و مورفولوژیک گیاه در فاصله زمانی 15 روز یکبار در چهار مرحله اندازه‌گیری گردید. مطالعه شاخص‌های جوانه‌زنی نشان داد که کمترین میانگین زمان جوانه زنی، بیشترین سرعت جوانه‌زنی، بیشترین طول ریشه‌چه، طول ساقه‌چه، تعداد ریشه جانبی و وزن تر ریشه‌چه در تیمار نور قرمز (100%) و پس از آن در تیمار نور قرمز (70%) + نور آبی (30%) مشاهده شد. استفاده از نور قرمز (100%) سرعت جوانه‌زنی، طول ریشه‌چه، طول ساقه‌چه، تعداد ریشه جانبی و وزن تر ریشه‌چه را به ترتیب تقریبا 14%، 29%، 48%، 100% و 67% در مقایسه با تیمار شاهد بهبود بخشید. بیشترین ارتفاع گیاه در ابتدا و انتهای رشد مربوط به گیاهان رشد یافته در تیمار نور قرمز (100%) بود. در انتهای مرحله رشدی (75 روز پس از کشت بذر) گیاهان تحت تیمار نور قرمز (100%) از لحاظ قطر ساقه، طول بزرگترین برگ مرکب، تعداد برگ و تعداد شاخه جانبی به ترتیب تقریبا 37%، 6%، 33% و 31% در مقایسه با تیمار نور سفید در همان مرحله رشدی افزایش داد. علاوه بر این، وزن تر و خشک گیاه را در مقایسه با تیمار شاهد در همان مرحله رشدی به ترتیب تقریبا 56% و 9% افزایش یافت. مطالعه وزن تر و خشک ریشه نشان داد که اعمال تیمار نور قرمز (100%) این دو شاخص را تقریبا نزدیک به 3 برابر در مقایسه با تیمار شاهد افزایش داد. کمترین وزن تر و خشک ریشه در تیمار نور آبی (100%) و پس از آن تیمار نور قرمز (30%) + نور آبی (70%) مشاهده شد. همچنین، گیاهان رشد یافته در شرایط نور قرمز (100%) در مقایسه با گیاهان رشد یافته در سایر تیمارهای نوری دارای محتوی نسبی آب برگ بیشتر و نشت الکترولیت کمتری بودند. به طور کلی بر اساس نتایج پژوهش مشخص گردید که استفاده از نور قرمز (100%) منجر به افزایش درصد و سرعت جوانه‌زنی بذر گل جعفری گردید. علاوه بر این، استفاده از نور قرمز در شرایط کنترل شده منجر به افزایش شاخص‌های رشدی گیاه در مقایسه با سایر تیمارهای آزمایش گردید. از این رو، استفاده از نور قرمز در مراحل مختلف رشدی گل جعفری در شرایط کنترل شده قابل توصیه می‌باشد.

کلیدواژه‌ها

جوانه‌زنی؛ نور آبی؛ نور قرمز؛ نور مصنوعی

مراجع

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