Photosynthetica 1998, 35(1):61-69 | DOI: 10.1023/A:1006817714739

Differential expression of photosynthesis-related genes of reed ecotypes in response to drought and saline habitats

H.L. Wang1, L.M. Hao1, J.Q. Wen1, C.L. Zhang1, H.G. Liang1
1 Department of Biology, Lanzhou University, Lanzhou, P. R. China

Three ecotypes of reed (Phragmites communis Trinius), swamp reed (SR), dune reed (DR), and heavy salt meadow reed (HSMR), growing in desert regions of northwest China were simultaneously investigated in their natural state for gas exchange patterns and the expression of three photosynthesis-related genes, cab (the gene for the light-harvesting chlorophyll a/b binding protein, LHC), psbA (the gene for the reaction centre D1 protein of photosystem 2, PS2), and 16S rDNA (the gene for plastid 16S rRNA). Stomatal conductance (gs) and intercellular CO2 concentration (ci) were markedly lower in the two terrestrial ecotypes (DR and HSMR) as compared to SR, paralleling a similar observed depression in net photosynthetic rate (PN). However, DR with the lowest measured gs and ci still exhibited a higher PN compared to HSMR. These results suggest that both stomatal and non-stomatal factors account for the comparatively low carbon assimilation in the terrestrial ecotypes. An increase in the expression of photosynthesis-related genes was observed in DR compared to SR, whereas the reverse situation was true in HSMR. The expression of photosynthesis-related genes may contribute to reed plants' photosynthetic capacity per leaf area under natural water deficits, but the levels of photosynthesis-related gene expression are not directly correlated with reed plants' general ability for survival and adaptation under water deficient conditions.

Additional key words: cab; 16S rDNA; net photosynthetic rate; Phragmites communis; psbA; stomatal conductance

Prepublished online: March 1, 1998; Published: January 1, 1998  Show citation

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Wang, H.L., Hao, L.M., Wen, J.Q., Zhang, C.L., & Liang, H.G. (1998). Differential expression of photosynthesis-related genes of reed ecotypes in response to drought and saline habitats. Photosynthetica, 35(1), 61-69. doi: 10.1023/A:1006817714739
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