محلولپاشی نیترات کلسیم باعث بهبود فتوسنتز و افزایش فعالیت آنتیاکسیدانی شده و عمر گلجای گل رز را افزایش می‌دهد
محورهای موضوعی : مجله گیاهان زینتی
سعید خسروی
1
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لیلا چهل تنان
2
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علی تهرانی فر
3
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امیرحسین خوش گفتارمنش
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1 - گروه علوم باغبانی و مهندسی فضای سبز دانشکده کشاورزی، دانشگاه فردوسی مشهد، ایران
2 - گروه علوم باغبانی و مهندسی فضای سبز دانشکده کشاورزی، دانشگاه فردوسی مشهد
3 - استاد گروه باغبانی و فضای سبز دانشکده کشاورزی دانشگاه فردوسی مشهد، ایران
4 - گروه علوم خاک، دانشکده کشاورزی، دانشگاه صنعتی اصفهان، اصفهان، ایران
کلید واژه: تغذیه کلسیم, رشد, فتوسنتز, شاخص پایداری غشا, کیفیت پس از برداشت,
چکیده مقاله :
افزایش فتوسنتز برای افزایش رشد بسیار مهم است، همچنین تقویت فعالیت آنزیمهای آنتیاکسیدانی سبب بهبود کیفیت و عمر گلجای رز میشود. در این مطالعه، تأثیر محلولپاشی با غلظتهای مختلف نیترات کلسیم بر فتوسنتز، فعالیت آنزیمهای آنتیاکسیدانی و عمر گلجای رز جهت رسیدن به این اهداف مورد بررسی قرار گرفت. این آزمایش به صورت فاکتوریل و در قالب طرح کاملا′ تصادفی بر روی دو رقم گل رز انجام شد. نیترات کلسیم در غلظتهای 0 میلیگرم در لیتر (شاهد)، 80 میلیگرم در لیتر و 160 میلیگرم در لیتر هر هفته بر روی دو رقم "سامورایی" و "جمیلیا" محلولپاشی شد. نتایج نشان داد که محلولپاشی با نیترات کلسیم در غلظت 160 میلیگرم در لیتر، با افزایش 23.3٪ و 35.3٪ میزان فتوسنتز در رقم "جمیلیا" و "سامورایی" سبب بهبود صفات رشدی در هر دو رقم رز شد. علاوه بر این، استفاده از 160 میلیگرم در لیتر نیترات کلسیم باعث افزایش میزان تعرق شد که متعاقباً منجر به افزایش غلظت کلسیم در برگها و گلبرگهای رقم سامورایی (به ترتیب 2.9 و 2.5 برابر) و جمیلیا (به ترتیب 1.9 و 1.6 برابر) شد. استفاده از 160 میلیگرم در لیتر نیترات کلسیم با افزایش فعالیت پراکسیداز، سوپراکسید دیسموتاز و کاتالاز به ترتیب سبب افزایش 10.4٪ و 13.6٪ در شاخص پایداری غشا در ارقام "سامورایی" و "جمیلیا" گردید، این امر به افزایش طول عمر گلجای به میزان 4.33 روز در "سامورایی" و 4.03 روز در "جمیلیا" منجر شد. به طور کلی، استفاده از 160 میلیگرم در لیتر نیترات کلسیم باعث افزایش کیفیت گل‌های تولیدی شد و با بهبود فعالیت آنزیمهای آنتیاکسیدانی، عمر گلجای هر دو رقم رز را نیز افزایش داد.
Increasing photosynthesis is crucial for enhancing growth, also boosting antioxidant activity is essential for improving the quality and vase life of roses. This study evaluates how foliar application of calcium nitrate (Ca(NO₃)₂) at different concentrations affects photosynthesis, antioxidant enzyme activity, and vase life in roses to achieve this objective. In a factorial experiment based on a randomized complete design, the 'Samurai' and 'Jumilia' rose cultivars were subjected weekly to three concentrations of Ca(NO₃)₂: 0 mg/L (control), 80 mg/L, and 160 mg/L. The results showed that a 160 mg/L Ca(NO₃)₂ improved photosynthesis by 23.3% in 'Jumilia' and 35.3% in 'Samurai' providing evidence of enhanced growth traits in both rose cultivars. Additionally, the application of 160 mg/L Ca(NO₃)₂ increased transpiration, which subsequently led to higher calcium concentrations in the leaves and petals of 'Samurai' (by 2.9- and 2.5-fold, respectively) and 'Jumilia' (by 1.9- and 1.6-fold, respectively). The use of 160 mg/L Ca(NO₃)₂ elevated the activities of peroxidase, superoxide dismutase, and catalase, leading to a 10.4% and 13.6% increase in the membrane stability index in 'Samurai' and 'Jumilia', respectively, which resulted in an increase in vase life by 4.33 and 4.03 days for 'Samurai' and 'Jumilia', respectively. Overall, applying 160 mg/L Ca(NO₃)₂ enhanced flower quality and boosted antioxidant enzyme activity, resulting in prolonged vase life for both rose cultivars.
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