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首页> 外文期刊>Journal of Experimental Botany >Revealing diversity in structural and biochemical forms of C4 photosynthesis and a C3–C4 intermediate in genus Portulaca L. (Portulacaceae)
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Revealing diversity in structural and biochemical forms of C4 photosynthesis and a C3–C4 intermediate in genus Portulaca L. (Portulacaceae)

机译：揭示Portulaca L.（Portulacaceae）属C 4 光合作用和C 3 –C 4 中间体的结构和生化形式的多样性

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摘要

Portulacaceae is one of 19 families of terrestrial plants in which species having C4 photosynthesis have been found. Representative species from major clades of the genus Portulaca were studied to characterize the forms of photosynthesis structurally and biochemically. The species P. amilis, P. grandiflora, P. molokiniensis, P. oleracea, P. pilosa, and P. umbraticola belong to the subgenus Portulaca and are C4 plants based on leaf carbon isotope values, Kranz anatomy, and expression of key C4 enzymes. Portulaca umbraticola, clade Umbraticola, is NADP-malic enzyme (NADP-ME)-type C4 species, while P. oleracea and P. molokiniensis in clade Oleracea are NAD-ME-type C4 species, all having different forms of Atriplicoid-type leaf anatomy. In clade Pilosa, P. amilis, P. grandiflora, and P. pilosa are NADP-ME-type C4 species. They have Pilosoid-type anatomy in which Kranz tissues enclose peripheral vascular bundles with water storage in the centre of the leaf. Portulaca cf. bicolor, which belongs to subgenus Portulacella, is an NADP-ME C4 species with Portulacelloid-type anatomy; it has well-developed Kranz chlorenchyma surrounding lateral veins distributed in one plane under the adaxial epidermis with water storage cells underneath. Portulaca cryptopetala (clade Oleracea), an endemic species from central South America, was identified as a C3–C4 based on its intermediate CO2 compensation point and selective localization of glycine decarboxylase of the photorespiratory pathway in mitochondria of bundle sheath cells. The C4 Portulaca species which were examined also have cotyledons with Kranz-type anatomy, while the stems of all species have C3-type photosynthetic cells. The results indicate that multiple structural and biochemical forms of C4 photosynthesis evolved in genus Portulaca.
机译：马齿ae科是陆地植物的19科之一，其中发现了具有C 4 光合作用的物种。研究了来自马齿Port属主要进化枝的代表性物种，以结构和生物化学方式表征光合作用的形式。 P. amilis，P。grandiflora，P。molokiniensis，P。oleracea，P。pilosa和P. umbraticola物种属于Portulaca属，是基于叶片碳同位素值的C 4 植物， Kranz的解剖结构以及关键C 4 酶的表达。马齿ula属伞状伞是NADP-苹果酸酶（NADP-ME）型C 4 种，而油桐属中的油梨P. oleracea和molokiniensis是NAD-ME型C 4 种，均具有不同形式的Atriplicoid型叶片解剖结构。在Pilosa进化枝中，P。amilis，P。grandiflora和P. pilosa是NADP-ME型C 4 物种。它们具有Pilosoid型的解剖结构，其中Kranz组织将周围的血管束包裹起来，并在叶的中心储水。马齿ula属于马齿ula亚属的双色是具有马齿cell型解剖结构的NADP-ME C 4 物种。它具有发达的Kranz绿藻组织，周围的侧静脉分布在前表皮下的一个平面中，下方有储水单元。南美中部特有种马齿ulaPortulaca cryptopetala（clade Oleracea）根据其中间的CO 2 被鉴定为C 3 –C 4 >束鞘细胞线粒体中光呼吸途径的甘氨酸脱羧酶的补偿点和选择性定位。被检查的C 4 马齿ula物种的子叶也具有克兰兹型解剖结构，而所有物种的茎均具有C 3 型光合细胞。结果表明，马齿ula属植物进化出多种C 4 光合作用的结构和生化形式。

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