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首页> 外文期刊>Journal of Experimental Botany >Evolutionary physiology: the extent of C4 and CAM photosynthesis in the genera Anacampseros and Grahamia of the Portulacaceae
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Evolutionary physiology: the extent of C4 and CAM photosynthesis in the genera Anacampseros and Grahamia of the Portulacaceae

机译：进化生理：马齿科Anacampseros和Grahamia属中C 4 和CAM光合作用的程度

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摘要

The Portulacaceae is one of the few terrestrial plant families known to have both C4 and Crassulacean acid metabolism (CAM) species. There may be multiple origins of the evolution of CAM within the Portulacaceae but the only clear evidence of C4 photosynthesis is found in members of the genus Portulaca. In the Portulaca, CAM succulent tissue is overlaid with the C4 tissue in a unique fashion where both pathways are operating simultaneously. Earlier reports have shown that the clade containing the genera Anacampseros and Grahamia may also contain C4 photosynthetic species similar to the Portulaca, which would indicate multiple origins of C4 photosynthesis within the family. The aim of the present study was to ascertain the true photosynthetic nature of these genera. An initial survey of the carbon isotope composition of the Anacampseros ranged from –12.6‰ to –24.0‰, indicating very little CAM activity in some species, with other values close to the C4 range. Anacampseros (=Grahamia) australiana which had been previously identified as a C4 species had a carbon isotope composition value of –24.0‰, which is more indicative of a C3 species with a slight contribution of CAM activity. Other Anacampseros species with C4-like values have been shown to be CAM plants. The initial isotope analysis of the Grahamia species gave values in the range of –27.1‰ to –23.6‰, placing the Grahamia species well towards the C3 photosynthetic range. Further physiological studies indicated increased night-time CO2 uptake with imposition of water stress, associated with a large diurnal acid fluctuation and a marked increased phosphoenolpyruvate carboxylase activity. This showed that the Grahamia species are actually facultative CAM plants despite their C3-like carbon isotope values. The results indicate that the Grahamia and Anacampseros species do not utilize the C4 photosynthetic pathway. This is the first to identify that the Grahamia species are facultative CAM plants where CAM can be induced by water stress. This work supports earlier physiological work that indicates that this clade containing Anacampseros and Grahamia species comprises predominantly facultative CAM plants. This report suggests there may be only one clade which contains C4 photosynthetic members with CAM-like characteristics.
机译：马齿ae科是为数不多的同时具有C 4 和Crassulacean酸代谢（CAM）物种的陆生植物科之一。马齿ace科中CAM的进化可能有多种起源，但在马齿Port属的成员中发现了C 4 光合作用的唯一明确证据。在马齿ula中，CAM肉质组织以独特的方式被C 4 组织覆盖，两种途径同时起作用。较早的报道表明，包含Anacampseros和Grahamia属的进化枝也可能含有类似于Portulaca的C 4 光合物种，这表明C 4 光合作用的多种起源。家庭。本研究的目的是确定这些属的真实光合作用性质。 Anacampseros碳同位素组成的初步调查范围为–12.6‰至–24.0‰，表明某些物种的CAM活性极低，而其他值接近C 4 范围。先前被鉴定为C 4 物种的澳大利亚Anacampseros（= Grahamia）的碳同位素组成值为–24.0‰，这更表明是C 3 物种与CAM活动的贡献很小。具有C 4 样值的其他Anacampseros物种已被证明是CAM植物。对Grahamia物种的初始同位素分析得出的值在–27.1‰至–23.6‰范围内，使Grahamia物种很好地处于C 3 光合范围。进一步的生理研究表明，施加水分胁迫会增加夜间CO 2 的吸收，这与昼夜的酸价波动大，磷酸烯醇丙酮酸羧化酶活性显着增加有关。这表明Grahamia物种尽管具有C 3 样碳同位素值，但实际上是兼性的CAM植物。结果表明，Grahamia和Anacampseros物种没有利用C 4 光合途径。这是第一个鉴定出Grahamia属是兼性的CAM植物，其中水分胁迫可以诱导CAM。这项工作支持较早的生理工作，这表明该包含阿纳坎普罗斯和格陵兰物种的进化枝主要包含兼性CAM植物。该报告表明，可能只有一个进化枝包含具有CAM样特征的C 4 光合成员。

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    《Journal of Experimental Botany》 |2008年第7期|p.1735-1742|共8页
  • 作者

    Lonnie J. Guralnick1* Amanda Cline1 Monica Smith2 and Rowan F. Sage3;

  • 作者单位

    1Division of Natural Science &

    Mathematics, Western Oregon University, Monmouth, OR 97361, USA 2School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USA 3Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, M5S 1A1 Canada;

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