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首页> 外文期刊>Journal of Experimental Botany >Revealing diversity in structural and biochemical forms of C-4 photosynthesis and a C-3-C-4 intermediate in genus Portulaca L. (Portulacaceae)
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Revealing diversity in structural and biochemical forms of C-4 photosynthesis and a C-3-C-4 intermediate in genus Portulaca L. (Portulacaceae)

机译：揭示C-4光合作用的结构和生化形式的多样性和Portulaca L.（Portulacaceae）的C-3-C-4中间体

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摘要

Portulacaceae is one of 19 families of terrestrial plants in which species having C-4 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 C-4 plants based on leaf carbon isotope values, Kranz anatomy, and expression of key C-4 enzymes. Portulaca umbraticola, clade Umbraticola, is NADP-malic enzyme (NADP-ME)-type C-4 species, while P. oleracea and P. molokiniensis in clade Oleracea are NAD-ME-type C-4 species, all having different forms of Atriplicoid-type leaf anatomy. In clade Pilosa, P. amilis, P. grandiflora, and P. pilosa are NADP-ME-type C-4 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 C-4 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 C-3-C-4 based on its intermediate CO2 compensation point and selective localization of glycine decarboxylase of the photorespiratory pathway in mitochondria of bundle sheath cells. The C-4 Portulaca species which were examined also have cotyledons with Kranz-type anatomy, while the stems of all species have C-3-type photosynthetic cells. The results indicate that multiple structural and biochemical forms of C-4 photosynthesis evolved in genus Portulaca.
机译：Portulacaceae是19个陆生植物的一个植物之一，其中已发现具有C-4光合作用的物种。研究了Portulaca属的主要片状的代表性物种在结构上和生物化学上表征了光合作用形式。物种P. Amilis，P. Grandiflora，P.Molokiniensis，P. Oleracea，P.Pilosa和P.Mubraticola属于Subguus Portulaca，是基于叶碳同位素值，Kranz解剖学和表达的C-4植物关键的C-4酶。 Portulaca umbraticola，Clade Umbraticola，是NADP-meric酶（NADP-ME） - 型C-4物种，而P. Oleracea和Clade Oleracea的摩洛尼亚斯是NAD-ME-型C-4种，都具有不同的形式阿米利吡咯型叶子解剖学。在Clade Pilosa，P. Amilis，P. Grandiflora和P.Pilosa是NADP-ME型C-4种。它们具有pilosoid-型解剖学，其中Kranz组织将外周血管束封闭在叶子中心的水储存。 Portulaca CF.属于亚因子Portulacella的双色剂是一种含有Portulacelloid型解剖学的NADP-ME C-4种;它具有良好开发的Kranz紫围绕横向脉，在Adaxial表皮下分布在一个平面下，下面的水储水池。 Portulaca Cryptopetala（Clade Oleracea）是基于其中间二氧化碳补偿点和束鞘细胞线粒体线粒体中的光环脱羧酶的中间二氧化碳补偿点和甘氨酸脱羧酶的选择性定位的C-3-C-4。检查的C-4 Portulaca物种也有带Kranz型解剖学的子叶，而所有物种的茎有C-3型光合细胞。结果表明，在Portulaca属中，C-4光合作用的多种结构和生化形式。

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