Kranz anatomy is not essential for terrestrial C4 plant photosynthesis

被引:215
作者
Voznesenskaya, EV
Franceschi, VR
Kiirats, O
Freitag, H
Edwards, GE [1 ]
机构
[1] Washington State Univ, Sch Biol Sci, Pullman, WA 99164 USA
[2] Russian Acad Sci, VL Komarov Bot Inst, Lab Anat & Morphol, St Petersburg 197376, Russia
[3] Univ Gesamthsch Kassel, D-34109 Kassel, Germany
关键词
D O I
10.1038/35107073
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
An important adaptation to CO2-limited photosynthesis in cyanobacteria, algae and some plants was development of CO2-concentrating mechanisms (CCM)(1). Evolution of a CCM occurred many times in flowering plants, beginning at least 15-20 million years ago, in response to atmospheric CO2 reduction, climate change, geological trends, and evolutionary diversification of species(2). In plants, this is achieved through a biochemical inorganic carbon pump called C-4 photosynthesis, discovered 35 years ago(3). C4 photosynthesis is advantageous when limitations on carbon acquisition are imposed by high temperature, drought and saline conditions. It has been thought that a specialized leaf anatomy, composed of two, distinctive photosynthetic cell types (Kranz anatomy), is required for C-4 photosynthesis(4). We provide evidence that C-4 photosynthesis can function within a single photosynthetic cell in terrestrial plants. Borszczowia aralocaspica (Chenopodiaceae) has the photosynthetic features of C-4 plants, yet lacks Kranz anatomy. This species accomplishes C-4 photosynthesis through spatial compartmentation of photosynthetic enzymes, and by separation of two types of chloroplasts and other organelles in distinct positions within the chlorenchyma cell cytoplasm.
引用
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页码:543 / 546
页数:4
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