کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8357014 | 1542037 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
ABA accumulation in water-stressed Citrus roots does not rely on carotenoid content in this organ
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کلمات کلیدی
DPAAOGgeranylgeranyldiphosphateJA-Ile9-cis-Epoxycarotenoid dioxygenase (NCED)ZEPABA-GEPSYGGPPRWCNCEDABA9-cis-epoxycarotenoid dioxygenase - 9-cis-epoxycarotinoid dioxygenaseβ-carotene hydroxylase - β-کاروتن هیدروکسیلازβ-Glycosidase - β-گلیکوزیدازOsmotic stress - استرس اسمزیabscisic acid - اسید آبسزیکdihydrophaseic acid - اسید دی هیدرو فازیکphaseic acid - اسید فازzeaxanthin epoxidase - اکسیداز zeaxanthinGene expression - بیان ژنPhotosynthetically active radiation - تابش فعال فتوسنتزیPar - توسطJasmonoyl-isoleucine - جاسمونویل-ایولولینphytoene synthase - سنتاز فیتوئنRelative water content - محتوای آب نسبیNorflurazon - نورفلوآرزونPEG - پلیاتیلن گلیکول Water deficit - کمبود آب
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Sustained abscisic acid (ABA) accumulation in dehydrated citrus roots depends on the transport from aerial organs. Under this condition, the role of the β,β-carotenoids (ABA precursors) to the de novo synthesis of ABA in roots needs to be clarified since their low availability in this organ restricts its accumulation. To accomplish that, detached citrus roots were exposed to light (to increase their carotenoid content) and subsequently dehydrated (to trigger ABA accumulation). Stress imposition sharply decreased the pool of β,β-carotenoids but, unexpectedly, no concomitant rise in ABA content was observed. Contrastingly, roots of intact plants (with low levels of carotenoids) showed a similar decrease of ABA precursor together with a significant ABA accumulation. Furthermore, upon dehydration both types of roots showed similar upregulation of the key genes involved in biosynthesis of carotenoids and ABA (CsPSY3a; CsβCHX1; CsβCHX2; CsNCED1; CsNCED2), demonstrating a conserved transcriptional response triggered by water stress. Thus, the sharp decrease in root carotenoid levels in response to dehydration should be related to other stress-related signals instead of contributing to ABA biosynthesis. In summary, ABA accumulation in dehydrated-citrus roots largely relies on the presence of the aerial organs and it is independent of the amount of available root β,β-carotenoids.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Science - Volume 252, November 2016, Pages 151-161
Journal: Plant Science - Volume 252, November 2016, Pages 151-161
نویسندگان
MatÃas Manzi, Joanna Lado, MarÃa Jesús Rodrigo, Vicent Arbona, Aurelio (Dr.),