C-3-C-4 INTERMEDIATE SPECIES IN THE GENUS FLAVERIA - LEAF ANATOMY, ULTRASTRUCTURE, AND THE EFFECT OF O-2 ON THE CO2 COMPENSATION CONCENTRATION
C-3-C-4 INTERMEDIATE SPECIES IN THE GENUS FLAVERIA - LEAF ANATOMY, ULTRASTRUCTURE, AND THE EFFECT OF O-2 ON THE CO2 COMPENSATION CONCENTRATION
复制标题
DOI：
10.1007/bf00392462
复制
发表时间：
1984-01-01
期刊：
影响因子：
4.3
通讯作者：
CHOLLET, R
中科院分区：
文献类型：
--
作者：
HOLADAY, AS;LEE, KW;CHOLLET, R
通过对3种近缘种的叶片解剖、超微结构和CO2交换分析，表明它们是C3-C4中间植物。F.佛罗里达约翰斯顿，F。linearis Lag和F.绿叶茶灰色是双子叶C3植物的典型特征，但维管束鞘细胞含有含淀粉的叶绿体。In F. floridana和F. Chloraefolia的叶绿体和许多相关的线粒体主要向心排列，如在密切相关的C4种，F。布朗尼湖M.鲍威尔In F. linearis中，线粒体较少，叶绿体更均匀地分布在整个束鞘细胞质中。维管束鞘超微结构与CO2补偿浓度（. Gamma.）这些C3-C4中间黄曲霉属物种的值。在21%O2和25 ℃下，C，γ。对F. chloraefolia，F. linearis和F. floridana分别为23-26、14-19和8-10 μ l CO2 l-1。伽马的O2依赖性对F最大。chloraefolia和F. Linearis（与C3-C4中间型Panicum和Moricandia种相似）和F. floridana的O2响应与F. brownii在1.5 - 21%O2的条件下，但在较高的pO 2下更大。在叶解剖结构，维管束鞘超微结构，和O2依赖性的变化。在这些黄曲霉属物种中，可能表明该属内光合碳代谢途径的活跃进化。
Leaf anatomical, ultrastructural, and CO2-exchange analyses of 3 closely related species of Flaveria indicate that they are C3-C4 intermediate plants. The leaf mesophyll of F. floridana J. R. Johnston, F. linearis Lag and F. chloraefolia A. Gray is typical of that in dicotyledonous C3 plants, but the bundle sheath cells contain granal, starch-containing chloroplasts. In F. floridana and F. chloraefolia, the chloroplasts and numerous associated mitochondria are arranged largely centripetally, as in the closely related C4 species, F. Brownii A. M. Powell. In F. linearis, fewer mitochondria are present and the chloroplasts are more evenly distributed throughout the bundle sheath cytosol. There is no correlation between the bundle sheath ultrastructure and CO2 compensation concentration (.GAMMA.) values of these C3-C4 intermediate Flaveria species. At 21% O2 and 25.degree. C, .GAMMA. for F. chloraefolia, F. linearis and F. floridana is 23-26, 14-19 and 8-10 .mu.l CO2 l-1, respectively. The O2 dependence of .GAMMA. is the greatest for F. chloraefolia and F. linearis (similar to that for C3-C4 intermediate Panicum and Moricandia species) and the least for F. floridana, whose O2 response is identical to that for F. brownii from 1.5 to 21% O2, but greater at higher pO2. The variation in leaf anatomy, bundle sheath ultrastructure, and O2 dependence of .GAMMA. among these Flaveria species may indicate an active evolution in the pathway of photosynthetic C metabolism within this genus.