Photosynthetica 2010, 48(4):635-640 | DOI: 10.1007/s11099-010-0082-8

Chlorophyll a fluorescence responses of Haloxylon ammodendron seedlings subjected to progressive saline stress in the Tarim desert highway ecological shelterbelt

W. Han1,2, X. W. Xu1,*, L. Li1, J. Q. Lei1, S. Y. Li1
1 Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Xinjiang, P.R. China
2 Graduate University of the Chinese Academy of Sciences, Beijing, P.R. China

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-1, 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 (Fv/Fm), quantum yield of photochemical energy conversion in PSII (YII), the apparent rate of electron transport at the PSII level (ETR), photochemical quenching coefficient (qP), non-photochemical quenching (NPQ), quantum yield of nonregulated non-photochemical energy loss in PSII (YNO) and quantum yield of regulated non-photochemical energy loss in PSII (YII), at approximately 2-h intervals. Fv/Fm with 5 g L-1 (S2) was lower than that with 2 g L-1 (S1) but a little higher than 20 g L-1 (S5), respectively. Under the low light [photosyntheticallyactive radiation (PAR) ≤ 250 μmol m-2 s-1, at 08:00, 10:00 and 20:00 h of the local time], S1 kept the lowest YII and the highest YNPQ; while under the high light (PAR ≥ 1500 μmol m-2 s-1), the YII performed S1>S2>S5, and the reverse YNPQ; under mild light (250 μmol mt-2 s-1 ≤ PAR ≤ 1500 μmol m-2 s-1), S1 remained the highest YII, no matter the light and the salinity, the similar YNO 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.

Keywords: energy dissipation; irrigation with salt groundwater; PAM-2100; saline stress

Received: February 5, 2010; Accepted: June 21, 2010; Published: December 1, 2010Show citation

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Han, W., Xu, X.W., Li, L., Lei, J.Q., & Li, S.Y. (2010). Chlorophyll a fluorescence responses of Haloxylon ammodendron seedlings subjected to progressive saline stress in the Tarim desert highway ecological shelterbelt. Photosynthetica, 48(4), 635-640. doi: 10.1007/s11099-010-0082-8.
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