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首页> 外文期刊>Journal of Experimental Botany >Occurrence and forms of Kranz anatomy in photosynthetic organs and characterization of NAD-ME subtype C4 photosynthesis in Blepharis ciliaris (L.) B. L. Burtt (Acanthaceae)
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Occurrence and forms of Kranz anatomy in photosynthetic organs and characterization of NAD-ME subtype C4 photosynthesis in Blepharis ciliaris (L.) B. L. Burtt (Acanthaceae)

机译：茄属小食虫（Blepharis ciliaris（L.）B. L. Burtt（Acanthaceae））光合器官中Kranz解剖的发生，形式以及NAD-ME亚型C 4 光合作用的特征

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摘要

Blepharis (Acanthaceae) is an Afroasiatic genus comprising 129 species which occur in arid and semi-arid habitats. This is the only genus in the family which is reported to have some C4 species. Blepharis ciliaris (L.) B. L. Burtt. is a semi-desert species with distribution in Iran, Oman, and Pakistan. Its form of photosynthesis was investigated by studying different organs. C4-type carbon isotope composition, the presence of atriplicoid type Kranz anatomy, and compartmentation of starch all indicate performance of C4 photosynthesis in cotyledons, leaves, and the lamina part of bracts. A continuous layer of distinctive bundle sheath cells (Kranz cells) encircle the vascular bundles in cotyledons and the lateral vascular bundles in leaves. In older leaves, there is extensive development of ground tissue in the midrib and the Kranz tissue becomes interrupted on the abaxial side, and then becomes completely absent in the mature leaf base. Cotyledons have 5–6 layers, and leaves 2–3 layers, of spongy chlorenchyma beneath the veins near the adaxial side of the leaf, indicating bifacial organization of chlorenchyma. As the plant matures, bracts and spines develop and contribute to carbon assimilation through an unusual arrangement of Kranz anatomy which depends on morphology and exposure to light. Stems do not contribute to carbon assimilation, as they lack chlorenchyma tissue and Kranz anatomy. Analysis of C4 acid decarboxylases by western blot indicates B. ciliaris is an NAD-malic enzyme type C4 species, which is consistent with the Kranz cells having chloroplasts with well-developed grana and abundant mitochondria.
机译：Blepharis（Acanthaceae）是一种亚种亚种，包括129种在干旱和半干旱生境中发生的物种。这是该家族中唯一具有某些C 4 物种的属。 Blepharis ciliaris（L.）B.L.Burtt。是半荒漠物种，分布于伊朗，阿曼和巴基斯坦。通过研究不同器官来研究其光合作用的形式。 C 4 型碳同位素组成，三倍体型Kranz解剖结构的存在以及淀粉的分隔都表明C 4 光合作用在子叶，叶片和叶片部分中的表现act片。连续层的独特的束鞘细胞（Kranz细胞）环绕子叶的维管束和叶中的侧向维管束。在较老的叶片中，中脉中有大量的地面组织发育，而Kranz组织在其背面被打断，然后在成熟的叶片基部完全消失。子叶有5–6层，而叶片2–3层则位于叶的正反面附近的静脉下方的海绵状小鳞茎，表明小鳞茎的双面组织。随着植物的成熟，片和棘突会通过不寻常的Kranz解剖结构（取决于形态和光照）发展并促进碳同化。茎没有碳同化组织和克兰兹解剖结构，因此无助于碳的吸收。通过蛋白质印迹分析C 4 酸脱羧酶表明，纤毛芽孢杆菌是一种NAD-苹果酸酶，类型为C 4 ，与具有叶绿体且具有良好叶绿体的Kranz细胞一致。发达的谷物和丰富的线粒体。

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    《Journal of Experimental Botany》 |2008年第7期|p.1755-1765|共11页
  • 作者

    Hossein Akhani1* Maraym Ghasemkhani1 Simon D. X. Chuong2 and Gerald E. Edwards3*;

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    1Department of Plant Sciences, School of Biology, College of Science, University of Tehran, PO Box 14155-6455, Tehran, Iran 2Department of Biology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada 3School of Biological Sciences, Washington State University, Pullman, Washington, WA 99164-4236, USA;

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