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- Title
Chlorophyll a fluorescence responses of Haloxylon ammodendron seedlings subjected to progressive saline stress in the Tarim desert highway ecological shelterbelt.
- Authors
Han, W.; Xu, X. W.; Li, L.; Lei, J. Q.; Li, S. Y.
- Abstract
In order to assess the long-term impacts of saline groundwater irrigation to Haloxylon ammodendron, one of the main shrubs in the Tarim desert highway ecological shelterbelt, we irrigated the H. ammodendron seedlings with progressive saline groundwater (3-30 g L, simulation environment in the Tarim desert highway ecological shelterbelt) and investigated the diurnal variations of chlorophyll a (Chl a) fluorescence parameters, such as maximal quantum yield of photosystem II (PSII) photochemistry (F/F), quantum yield of photochemical energy conversion in PSII (Y), the apparent rate of electron transport at the PSII level (ETR), photochemical quenching coefficient (q), non-photochemical quenching (NPQ), quantum yield of nonregulated non-photochemical energy loss in PSII (Y) and quantum yield of regulated non-photochemical energy loss in PSII (Y), at approximately 2-h intervals. F/F with 5 g L (S2) was lower than that with 2 g L (S1) but a little higher than 20 g L (S5), respectively. Under the low light [photosyntheticallyactive radiation (PAR) ≤ 250 μmol m s, at 08:00, 10:00 and 20:00 h of the local time], S1 kept the lowest Y and the highest Y; while under the high light (PAR ≥ 1500 μmol m s), the Y performed S1>S2>S5, and the reverse Y; under mild light (250 μmol m s ≤ PAR ≤ 1500 μmol m s), S1 remained the highest Y, no matter the light and the salinity, the similar Y almost occurred basically. The results showed that the sand-binding plant H. ammodendron could regulate its energy-utilizing strategies. The S2 might be the most suitable salinity of the irrigation water for H. ammodendron in the Tarim desert highway ecological shelterbelt in the northwest of China.
- Publication
Photosynthetica, 2010, Vol 48, Issue 4, p635
- ISSN
0300-3604
- Publication type
Article
- DOI
10.1007/s11099-010-0082-8