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| Content Provider | Springer Nature Link |
|---|---|
| Author | Tang, Gang Liang Li, Xiang Yi Lin, Li Sha Gu, Zhu Yu Zeng, Fan Jiang |
| Copyright Year | 2016 |
| Abstract | Senescence is both a highly controlled and a strictly regulated process that is gene dependent. To study the PSII reaction in different types of leaf senescence processes, stem girdling was performed on Alhagi sparsifolia to investigate the leaf status in the control, natural senescence, and girdling-induced senescence leaves. The results showed that during senescence, leaf soluble sugar content, starch content, and the energy absorbed by the unit reaction center (ABS/RC) increased; whereas leaf photosynthetic rate, photosynthetic pigment content, maximum photochemical efficiency (φ Po), and energy used by the acceptor site in electron transfer (ETo/RC) decreased. The result of the present research implied that stem girdling significantly accelerated leaf senescence, which was due to the accumulation of carbohydrate. Natural senescence is a highly controlled process, which is an ordered process played by genes, whereas girdling-induced senescence is a disordered one. In addition, natural senescence slightly inhibits the acceptor site of PSII but did not damage the donor site of PSII. Conversely, girdling-induced senescence not only damaged the donor site of PSII (for example, oxygen-evolving complex), but also significantly inhibited the acceptor site of PSII. Moreover, both types of senescence led to an increase in the energy absorbed by the unit reaction center (ABS/RC), which subsequently resulted in an increasing excitation pressure in the reaction center (DIo/RC), as well as additional saved carotenoid for absorbing residual light energy and quenching reactive oxygen species during senescence. |
| Starting Page | 952 |
| Ending Page | 964 |
| Page Count | 13 |
| File Format | |
| ISSN | 07217595 |
| Journal | Journal of Plant Growth Regulation |
| Volume Number | 35 |
| Issue Number | 4 |
| e-ISSN | 14358107 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2016-03-17 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Alhagi sparsifolia Carbohydrate Chlorophyll fluorescence Girdling Induced senescence, natural senescence Plant Sciences Plant Anatomy/Development Plant Physiology Agriculture |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Agronomy and Crop Science |
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