| Effect of AMF on growth and chlorophyII fluorescence parameters of Sedum aizoon L. seedlings under NaCl stress |
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| DOI：10.7606/j.issn.1000-7601.2017.06.20 |
| Key Words: NaCl stress Sedum aizoon L. arbuscular mycorrhizal fungus chlorophyll fluorescence parameters salt injury index |
| Author Name | Affiliation | | WANG Yi-ming | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 61130, China | | TANG Jian | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 61130, China | | LONG Sheng-ju | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 61130, China | | ZHAO Ying-peng | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 61130, China | | HE Zhong-qun | College of Horticulture, Sichuan Agricultural University, Chengdu, Sichuan 61130, China |
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| Abstract: |
| Sedum aizoon L. seedlings were treated with NaCl (0, 8, 12, 16, 20 g·kg-1) in plastic pots with soil. We studied the effects of NaCl on growth, chlorophyll content and chlorophyII fluorescence parameters after 28 days. The results indicated that with the increase of NaCl concentration in the range of 0 g·kg-1 to 8 g·kg-1, Chlorophyll content, minimal fluorescence (Fo), and the salt injury index increased, while maximum fluorescence (Fm), photochemical maximum efficiency of PSII(Fv/Fm), actual photochemical efficiency(ΦPSⅡ), non-photochemical quenching coefficient (NPQ), and the ability of leaves to transform energy decreased compared with the control. In addition, photochemical quenching coefficient (qP) and electron transport rate (ETR) decreased. Treatment of 8 g·kg-1 NaCl caused damage of photo-protective mechanisms. After inoculation with different AMF, the root length, plant height, root-shoot ratio, root activity were significantly increased compared with the control. Fv/Fm was significantly increased under the stress by inoculated with AMF. Inoculation with AMF reduced the damage of electron transfer rate, light energy conversion efficiency, the damage to PSII resulted from the excess excitation energy by increasing thermal dissipation, and maintain as much as energy to participate in photochemical reactions. It improved the photosynthetic ability of Sedum aizoon L. and eventually enhanced plant resistance to salt stress. However, when the concentration exceeded 12 g·kg-1, PSII also suffered from damages. Compared with GMH, GMA can improve the salt tolerance of Sedum aizoon L. |
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