Exogenous Putrescine Delays Senescence of Lisianthus Cut Flowers
محورهای موضوعی : مجله گیاهان زینتی
Davoud Ataii
1
(Department of Horticultural Sciences, Faculty of Agricultural Sciences and Natural Resources, University
of Tehran, Karaj, Iran.)
Roohangiz Naderi
2
(Department of Horticultural Sciences, Faculty of Agricultural Sciences and Natural Resources, University
of Tehran, Karaj, Iran.)
Azizollah Khandan-Mirkohi
3
(Department of Horticultural Sciences, Faculty of Agricultural Sciences and Natural Resources, University
of Tehran, Karaj, Iran.)
کلید واژه: antioxidant enzyme, Lipoxygenase, Lisianthus, Vase life, putrescine,
چکیده مقاله :
The anti-senescence biogenic polyamines (PAs) putrescine (Put), spermidine(Spd) and spermine (Spm) are involved in plant growth processes andresponses to stress. The physiological mechanism of exogenous Put to affectthe senescence of cut lisianthus flowers during vase life was investigated.Fresh cut lisianthus flowers were treated with distilled water (control), 0.5, 1and 2 mM Put and then held at 25 ◦C up to 12 days. Exogenous Put supply at2 mM extended vase life, which was associated with reduced electrolyteleakage and MDA content. Put treatment also reduced activity of lipoxygenase(LOX), is responsible for membrane lipid peroxidation. Put treatment also enhancedactivities of catalase (CAT) and ascorbate peroxidase (APX) anddecreased H2O2 accumulation during vase life. Thus, exogenous Put supplycould maintain membrane integrity by increasing antioxidant system activity,thereby retarding the senescence of cut lisianthus flower during vase life.
پل یآمی نهای پوترسین، اسپرمیدین و اسپرمین مواد ضد پیری هستندکه در فرآیندهای رشد گیاه و در پاسخ به تن شها نقش دارند. مکانیسمفیزیولوژیکی که کاربرد پوترسین پیری گل شاخه بریده لیزیانتوس را در طولعمر گلجایی تحت تاثیر قرار می دهد مورد بررسی قرار گرفته است. گل های1 و 2 میلی مولار پوترسین ،0/ شاخه بریده لیزیانتوس با آب مقطر )شاهد(، 5تی ار شدند و در دمای 25 دجه سانت یگراد تا 12 روز نگهداری شدند. کاربردپوترسین با غلظت 2 میلی مولار عمر گلجایی را توسعه داد که با کاهش نشتمرتبط بود. تی ار پوترسین فعالیت )MDA( یونی و محتوای مالون دی آلدئیدرا که مسئول پراکسیداسیون چربی های غشاء است )LOX( آنزیم لیپوکسی ژنازو )CAT( را کاهش داد. تی ار پوترسین همچنین فعالیت آنزیم های کاتالازرا )H2O را افزایش و تجمع پراکسید هیدروژن ) 2 )APX( آسکوربات پراکسیدازدر طول عمر گلجایی کاهش داد. بنابراین کاربرد پوترسین م یتواند نفوذپذیریغشاء را به وسیله افزایش فعالیت سیستم آنتی اکسیدانی حفظ کند و در نتیجهپیری گل شاخه بریده لیزیانتوس را در طول عمر گلجایی به تاخیر بیندازد.
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