کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2016586 | 1067671 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Environmental stresses induce health-promoting phytochemicals in lettuce
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کلمات کلیدی
γ-tocopherol methyltransferasel-galactose dehydrogenaseSDSCTABABTSPAL2,2′-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid)PPFDcetyltrimethylammonium bromide - اتلی تریمتیل آمونیوم برومیدEDTA - اتیلن دی آمین تترا استیک اسید ethylene diamine tetraacetic acid - اتیلن دیامین تتراستیک اسیدEnvironmental stresses - تنش های محیطیsodium dodecyl sulfate - سدیم دودسیل سولفاتAntioxidant capacity - ظرفیت آنتی اکسیدانphotosynthetic photon flux density - فتوسنتز تراکم شار فوتونPhenolics - فنولیکphenylalanine ammonia-lyase - فنیل آلانین آمونیاک-لیائازPhytochemicals - فیتوکمیکال هاTotal phenolic content - محتوای فنلی کلLettuce - کاهوhigh-performance liquid chromatography - کروماتوگرافی مایعی کاراHPLC - کروماتوگرافی مایعی کارا
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Plants typically respond to environmental stresses by inducing antioxidants as a defense mechanism. As a number of these are also phytochemicals with health-promoting qualities in the human diet, we have used mild environmental stresses to enhance the phytochemical content of lettuce, a common leafy vegetable. Five-week-old lettuce (Lactuca sativa L.) plants grown in growth chambers were exposed to mild stresses such as heat shock (40 °C for 10 min), chilling (4 °C for 1 d) or high light intensity (800 μmol mâ2 sâ1 for 1 d). In response to these stresses, there was a two to threefold increase in the total phenolic content and a significant increase in the antioxidant capacity. The concentrations of two major phenolic compounds in lettuce, chicoric acid and chlorogenic acid, increased significantly in response to all the stresses. Quercetin-3-O-glucoside and luteolin-7-O-glucoside were not detected in the control plants, but showed marked accumulations following the stress treatments. The results suggest that certain phenolic compounds can be induced in lettuce by environmental stresses. Of all the stress treatments, high light produced the greatest accumulation of phenolic compounds, especially following the stress treatments during the recovery. In addition, key genes such as phenylalanine ammonia-lyase (PAL), l-galactose dehydrogenase (l-GalDH), and γ-tocopherol methyltransferase (γ-TMT) involved in the biosynthesis of phenolic compounds, ascorbic acid, and α-tocopherol, respectively, were rapidly activated by chilling stress while heat shock and high light did not appear to have an effect on the expression of PAL and γ-TMT. However, l-GalDH was consistently activated in response to all the stresses. The results also show that these mild environmental stresses had no adverse effects on the overall growth of lettuce, suggesting that it is possible to use mild environmental stresses to successfully improve the phytochemical content and hence the health-promoting quality of lettuce with little or no adverse effect on its growth or yield.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Physiology and Biochemistry - Volume 47, Issue 7, July 2009, Pages 578-583
Journal: Plant Physiology and Biochemistry - Volume 47, Issue 7, July 2009, Pages 578-583
نویسندگان
Myung-Min Oh, Edward E. Carey, C.B. Rajashekar,