Girdling-induced Alhagi sparsifolia senescence and chlorophyll fluorescence changes

Title:

Girdling-induced Alhagi sparsifolia senescence and chlorophyll fluorescence changes

Creator:

Tang, G.-L., Li, X.-Y., Lin, L.-S., Zeng, F.-J., and Gu, Z.-Y.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:ea05eab1-f11f-4982-b70a-f360584ff0db
uuid:ea05eab1-f11f-4982-b70a-f360584ff0db
issn:0300-3604
doi:10.1007/s11099-015-0148-8

Subject:

fotosyntéza, photosynthesis, carbon, nutrient cycling, photosynthetic apparatus, photosynthetic pigment, reactive oxygen, stress, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

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., G.-L. Tang, X.-Y. Li, L.-S. Lin, F.-J. Zeng, Z.-Y. Gu., and Obsahuje seznam literatury

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

585-596

Source:

Photosynthetica | 2015 Volume:53 | Number:4

Harvested from:

CDK

Metadata only:

false