کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5515513 1541909 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Short communicationEnhanced plastochromanol-8 accumulation during reiterated drought in maize (Zea mays L.)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Short communicationEnhanced plastochromanol-8 accumulation during reiterated drought in maize (Zea mays L.)
چکیده انگلیسی


- Plastochromanol-8 (PC-8) accounts for more than 25% of tocochromanols in maize leaves.
- PC-8 levels increase in response to repeated periods of drought stress.
- Drought training increases PC-8 and vitamin E accumulation in leaves.
- PC-8 and vitamin E accumulation may be modulated by abscisic acid levels.

Plastochromanol-8 (PC-8) belongs to the group of tocochromanols, and together with tocopherols and carotenoids, might help protect photosystem II from photoinhibition during environmental stresses. Here, we aimed to unravel the time course evolution of PC-8 together with that of vitamin E compounds, in maize (Zea mays L.) plants exposed to reiterated drought. Measurements were performed in plants grown in a greenhouse subjected to two consecutive cycles of drought-recovery. PC-8 contents, which accounted for more than 25% of tocochromanols in maize leaves, increased progressively in response to reiterated drought stress. PC-8 contents paralleled with those of vitamin E, particularly α-tocopherol. Profiling of the stress-related phytohormones (ABA, jasmonic acid and salicylic acid) was consistent with a role of ABA in the regulation of PC-8 and vitamin E biosynthesis during drought stress. Results also suggest that PC-8 may help tocopherols prevent damage to the photosynthetic apparatus. A better knowledge of the ABA-dependent regulation of PC-8 may help us manipulate the contents of this important antioxidant in crops.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Physiology and Biochemistry - Volume 112, March 2017, Pages 283-289
نویسندگان
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