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cje ›› 2012, Vol. 31 ›› Issue (01): 30-37.

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Effects of soil water regime on leaf photosynthetic characteristics of slash pine (Pinus elliottii Engelm.)seedlings.

ZHOU Jun1,2, WEI Hong1,2**, LÜ Qian1,2, LI Chang-xiao1,2, WANG Zhen-xia1,2, GAO Wei1,2, CHEN Wei1,2   

  1. 1Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing 400715, China;2 School of Life Science, Southwest University, Chongqing 400715, China
  • Online:2012-01-08 Published:2012-01-08

Abstract: Four treatments (normal soil water condition, CK; light drought condition,T1; water saturation condition, T2; and submersion condition, T3) were installed to study the responses in leaf photosynthesis and chlorophyll fluorescence parameters of slash pine (Pinus elliottii Engelm.) seedlings to different soil water regimes. Differences were observed in the responses of the leaf gas exchange parameters, water use efficiency (WUE), photosynthetic pigment contents, and chlorophyll fluorescence parameters to the soil water regimes. The photosynthetic pigment contents were the lowest in treatment T3, and the net photosynthetic rate (Pn), electron transport rate (ETR), and quantum yield of PSII photochemistry (ΦPSII) were lower in treatments T2 and T3, as compared with CK. The slash pine seedlings in treatmentT3 still had a higher Pn than the other plant species that have high tolerance to inundation, indicating that the slash pine seedlings had high tolerance to inundation. In treatment T1, the seedlings kept high WUE, low stomatal conductance (Gs), and low transpiration rate (Tr) against the drought stresses, while decreased Pn, potential efficiency of primary conversion energy of PSII (Fv/Fm),ETR, and ΦPSII, though these parameters were still maintained at relatively normal level. The above results suggested that slash pine seedlings could not only tolerate water-logging, but also endure a certain degree of drought, and that slash pine could be a candidate species in re-vegetation of the Three Gorges Reservoir region.

Key words: savoy, light quality, chlorophyll, photosynthetic characteristics, nutritional quality.