| Effects of different interstocks on photosynthetic and chlorophyll fluorescence characteristics in leaves of ‘Yueguan’ apple under different drought stress conditions |
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| DOI：10.7606/j.issn.1000-7601.2019.05.13 |
| Key Words: ‘Yueguan’ apple drought stress interstock photosynthetic characteristic chlorophyll fluorescence characteristic |
| Author Name | Affiliation | | LI Cheng-hui | Liaoning Research Institute of Pomology, Yingkou, Liaoning 115009, China | | LIU Zhi | Liaoning Research Institute of Pomology, Yingkou, Liaoning 115009, China | | WANG Hong | Liaoning Research Institute of Pomology, Yingkou, Liaoning 115009, China | | YU Nian-wen | Liaoning Research Institute of Pomology, Yingkou, Liaoning 115009, China | | WANG Jie | Liaoning Research Institute of Pomology, Yingkou, Liaoning 115009, China | | ZHANG Xiu-mei | Liaoning Research Institute of Pomology, Yingkou, Liaoning 115009, China | | LI Hong-jian | Liaoning Research Institute of Pomology, Yingkou, Liaoning 115009, China | | SONG Zhe | Liaoning Research Institute of Pomology, Yingkou, Liaoning 115009, China |
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| Abstract: |
| Yueguan/Liaozhen 2/Malus baccata, Yueguan/GM256/Malus baccata, Yueguan/77-34/Malus baccata and Yueguan/Malus baccata of two years old were grafted in pots as test materials to study the effects of different interstocks on photosynthetic characteristics, the fast chlorophyll fluorescence induction dynamics parameters and curves (OJIP) of leaves under the different drought stress treatments, that included normal water supply, slight water stress, medium water stress and severe water stress. The results showed that slight water stress increased chlorophyll A（6.3%）, chlorophyll A+B（5.9%）, Pn (9.7%）of Yueguan/Malus baccata and WUE（73.0%, 116.1%, 155.3%, and 105.7%）of 4 stion. Medium water stress and severe water stress decreased Pn (1219.2%, 938.5%, 786.7%, 583.3% and 8475.0%, 9826.5%, 1895.1%, 1384.4%）, Gs (813.0%, 875.4%, 866.5%, 508.3% and 1066.7%, 592.1%, 852.1%, 1274.4%）and Tr (783.3%, 695.0%, 795.2%, 356.8% and 527.7%, 341.7%, 403.6%, 692.2%) of 4 stion, and Ci (49.3%, 48.3%, 53.0%, 51.5% and 83.1%, 108.5%, 67.0%, 55.2%) increased. In addition, after the analysis of OJIP curves, The K phase appeared clearly under the medium and severe water stress, and the J phase value also increased significantly. Moreover, with the increase of the degree of water stress, Fo, WK and VJ in the chlorophyll fluorescence parameters of each stion increased gradually; Fv/Fm, Fv/Fo, PIabs, PItotal, ABS/CSm, TRo/CSm, ETo/CSm and RC/CSm decreased gradually. This showed that medium water stress and severe water stress caused the PSII donor side, receptor side and reaction center to damage in different degree. This resulted in that the electron transfer was blocked and the efficiency of the solar energy absorption of leaves was reduced. At the same time, PSI had been destroyed, thereby broke the coordination of the two light systems. The destruction of Yueguan/Malus baccata and Yueguan/77-34/Malus baccata was significantly lower than others. This showed that the drought resistance of Yueguan/Malus baccata and Yueguan/77-34/Malus baccata were better than the other two stion in the medium and late water stress. |
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