Salsola arbusculiformis, a C3–C4Intermediate in Salsoleae (Chenopodiaceae)
Salsola arbusculiformis, a C3–C4Intermediate in Salsoleae (Chenopodiaceae)
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DOI：
10.1006/anbo.2001.1457
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发表时间：
2001-09
期刊：
影响因子：
4.2
通讯作者：
E. Voznesenskaya;E. Artyusheva;V. Franceschi;V. Pyankov;O. Kiirats;M. Ku;G. Edwards
中科院分区：
文献类型：
--
作者：
E. Voznesenskaya;E. Artyusheva;V. Franceschi;V. Pyankov;O. Kiirats;M. Ku;G. Edwards
基于解剖、生化和生理特征，本文认为Salsola arbusculliformis是c3‐c4中间种。这是藜科植物中天然存在的中间种的首次报道，藜科植物中C4种类最多。在Salsola属中，大多数物种具有Salsoloid解剖结构，具有Kranz型束鞘细胞和C4光合作用，而少数物种具有Sympegmoid解剖结构，具有非Kranz型束鞘细胞和C3光合作用。在具有Salsoloid解剖结构的C4 Salsola的圆柱形叶片中，有一层明显的连续的绿质Kranz型束鞘细胞被单层叶肉细胞包围；而同聚型解剖的种有不明显的束鞘，叶绿体很少，有多层的绿质叶肉细胞。然而，丛枝草具有中等的解剖特征。虽然它有两到三层叶肉细胞，这是合聚类解剖结构的特征，但它有独特的克兰兹样束鞘细胞，有许多叶绿体和线粒体。对其CO2补偿点和光合作用CO2响应的测量表明，丛枝草是一个光呼吸水平较低的中间物种。减少光呼吸的主要手段被认为是通过在束鞘细胞中重新固定光呼吸的二氧化碳，因为光合酶（活性和免疫定位）的分析和初始固定产物的14 CO2标记表明C4循环的最小操作。# 2001植物学公司年鉴
Salsola arbusculiformis is identified as a C 3 ‐C 4 intermediate species based on anatomical, biochemical and physiological characteristics. This is the first report of a naturally occurring intermediate species in the Chenopodiaceae, the family with the largest number of C4 species amongst the dicots. In the genus Salsola, most species have Salsoloid anatomy with Kranz type bundle sheath cells and C4 photosynthesis, while a few species have Sympegmoid anatomy and were found to have non-Kranz type bundle sheath cells and C3 photosynthesis. In the cylindrical leaves of C4 Salsola with Salsoloid type anatomy, there is a continuous layer of distinct, chlorenchymatous Kranz type bundle sheath cells surrounded by a single layer of mesophyll cells; whereas species with Sympegmoid type anatomy have an indistinct bundle sheath with few chloroplasts and multiple layers of chlorenchymatous mesophyll cells. However, S. arbusculiformis has intermediate anatomical features. While it has two-to-three layers of mesophyll cells, characteristic of Sympegmoid anatomy, it has distinctive, Kranz-like bundle sheath cells with numerous chloroplasts and mitochondria. Measurements of its CO2 compensation point and CO2 response of photosynthesis show S. arbusculiformis functions as an intermediate species with reduced levels of photorespiration. The primary means of reducing photorespiration is suggested to be by refixing photorespired CO2 in bundle sheath cells, since analysis of photosynthetic enzymes (activity and immunolocalization) and 14 CO2 labelling of initial fixation products suggests minimal operation of a C4 cycle. # 2001 Annals of Botany Company