caa a22 4500 605480818 CHVBK 20210128100417.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s11099-015-0148-8 doi (NATIONALLICENCE)springer-10.1007/s11099-015-0148-8 Girdling-induced Alhagi sparsifolia senescence and chlorophyll fluorescence changes [Elektronische Daten] [G. Tang, X. Li, L. Lin, F. Zeng, Z. Gu] Senescence constitutes the final stage of a plant organ and tissue development and is a subject to gene control and strict regulation. By the late growing season, when Alhagi sparsifolia entered the natural senescence period, a girdling treatment was carried out on the phloem to increase the sugar content in leaves and to investigate carbohydrate-induced leaf senescence. After the semi-girdling and full-girdling treatment, organic matter could not leave leaves due to the destruction of sieve tubes. This led to constantly increasing sugar contents in leaves. Girdling was shown to greatly accelerate the senescence of plants. In girdled leaves, chlorophyll (Chl) a, Chl b, carotenoids (Car), and both ratios of Chl a/b and Chl/Car were significantly reduced. On the donor side of PSII, the oxygen-evolving complex was inhibited under high concentrations of carbohydrates, which was manifested as the emergence of the K phase in fluorescence kinetic curves. On the acceptor side of PSII, the high carbohydrate content also led to the disruption of electron transport and reduced light-use efficiency, which was manifested as a reduction in numerous fluorescence parameters. We believe that the emergence and development of plant senescence was not necessarily induced by the high content of carbohydrates, because even a decrease in the carbohydrate concentration could not stop the senescence process. Although the high content of carbohydrates in plants could induce plant senescence, this kind of senescence was likely a pathological process, including degradations of physiological functions. The Institute of Experimental Botany, 2015 carbon nationallicence nutrient cycling nationallicence photosynthetic apparatus nationallicence photosynthetic pigment nationallicence reactive oxygen nationallicence stress nationallicence Car : carotenoids nationallicence Chl : chlorophyll nationallicence CK : control nationallicence DM : dry mass nationallicence FG : full-girdling nationallicence FM : fresh mass nationallicence Fv/Fm : maximal quantum yield of PSII photochemistry nationallicence MDA : malondialdehyde nationallicence M0 : approximated initial slope of the fluorescence transient nationallicence OEC : oxygen-evolving complex nationallicence PIabs : performance index on absorption basis nationallicence P N : net photosynthetic rate nationallicence Pro : proline nationallicence PQ : plastoquinone nationallicence QA : primary quinone acceptor of PSII nationallicence QB : secondary quinone acceptor of PSII nationallicence SE : standard error nationallicence SG : semigirdling nationallicence Sm : normalized total complementary area above the O-J-I-P transient nationallicence Ψ0 : probability that a trapped exciton moves an electron into the electron transport chain beyond QA − (at t = 0) nationallicence φE0 : quantum yield for electron transport (at t = 0) nationallicence Tang G. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011, Urumqi, China aut Li X. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011, Urumqi, China aut Lin L. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011, Urumqi, China aut Zeng F. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011, Urumqi, China aut Gu Z. Xinjiang Key Laboratory of Soil and Plant Ecological Processes, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, 830052, Urumqi, China aut Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/4(2015-12-01), 585-596 0300-3604 53:4<585 2015 53 11099 https://doi.org/10.1007/s11099-015-0148-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11099-015-0148-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tang G. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011, Urumqi, China aut NATIONALLICENCE 700 1- Li X. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011, Urumqi, China aut NATIONALLICENCE 700 1- Lin L. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011, Urumqi, China aut NATIONALLICENCE 700 1- Zeng F. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011, Urumqi, China aut NATIONALLICENCE 700 1- Gu Z. Xinjiang Key Laboratory of Soil and Plant Ecological Processes, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, 830052, Urumqi, China aut NATIONALLICENCE 773 0- Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/4(2015-12-01), 585-596 0300-3604 53:4<585 2015 53 11099