کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8387031 | 1543858 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Changes in activities of both photosystems and the regulatory effect of cyclic electron flow in field-grown cotton (Gossypium hirsutum L) under water deficit
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کلمات کلیدی
ΔpHmaximum quantum efficiency of PSIIPSIY(NPQ)ΨwPSIIquantum efficiency of PSIICEFFv′/Fm′Fm′ - Fm 'Fv/Fm - Fv / FmΔψ - ΔρThermal dissipation - تسریع حرارتیCyclic electron flow - جریان الکتریکی سیسیکPhotochemical quenching - رفع عکس شیمیاییZeaxanthin - زاکسانتیینPhotosystems - سیستم های عکسphotosystem I - عکس سیستم منPhotosystem II - فتوسیستم 2Fo′ - فوnet CO2 assimilation rate - میزان جذب CO2 خالصStomatal conductance - هدایت گرمایشیY(NO) - و (نه)Leaf water potential - پتانسیل آب برگCotton - کتانWater deficit - کمبود آبY(II) - ی (دوم)Y(I) - ی (ی)
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
To clarify the influence of water deficit on the functionality of the photosynthetic apparatus of cotton plants, leaf gas exchange, chlorophyll a fluorescence, and P700 redox state were examined in field-grown cotton Gossypium hirsutum L. cv. Xinluzao 45. In addition, we measured changes in the P515 signal and analyzed the activity of ATP synthase and the trans-thylakoid proton gradient (ÎpH). With increasing water deficit, the net CO2 assimilation rate (AN) and stomatal conductance (gs) significantly decreased, but the maximum quantum efficiency of PSII photochemistry (Fv/Fm) did not change. The photochemical activity of photosystem II (PSII) was reflected by the photochemical quenching coefficient (qP), quantum efficiency of photosystem II [Y(II)], and electron transport rate through PSII [ETR(II)], while the activity of photosystem I (PSI) was reflected by the quantum efficiency of photosystem I [Y(I)] and the electron transport rate through PSI [ETR(I)]. Both activities were maintained under mild water deficit, but were slightly decreased under moderate water deficit. Under moderate water deficit, cyclic electron flow (CEF), the fraction of absorbed light dissipated thermally via the ÎpH- and xanthophyll-regulated process [Y(NPQ)], and the fraction of P700 oxidized under a given set of conditions [Y(ND)] increased. Our results suggest that the activities of both photosystems are stable under mild water deficit and decrease only slightly under moderate water deficit. Moderate water deficit stimulates CEF, and the stimulation of CEF is essential for protecting PSI and PSII against photoinhibition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Plant Physiology - Volume 220, January 2018, Pages 74-82
Journal: Journal of Plant Physiology - Volume 220, January 2018, Pages 74-82
نویسندگان
Xiao-Ping Yi, Ya-Li Zhang, He-Sheng Yao, Ji-Mei Han, Wah Soon Chow, Da-Yong Fan, Wang-Feng Zhang,