Anatomical Structure and C4 Photosynthetic Characteristics of Seven Atriplex Species
Atriplex is a kind of typical plant species which grows in drought and semi-drought areas around the world.In order to provide a theoretical basis of reference for its photosynthetic characteristics,a series of leaf anatomical structure,stable carbon isotope ratio (13C/12C) and photosynthetic characteristics of seven 3-year-old Atriplex species introduced from North America were studied.The results showed that: All of the 7 Atriplex species have got Kranz anatomy and fences-like Mesophyll cell which contains bundle sheath cell inside; They can grow in both drought desert environment(Minqin in Gansu Province) and relatively humid condition (Yuanyang in Henan Province) with average δ13 C value from-13‰ to-16‰; The light saturation points of the 7 species were from 1603 to 2185 μmol· m-2 s-1 and the apparent quantum yields were from 0.0495 to 0.0718 mol CO2·mol-1 photons during the growing seasons.It was concluded that the 7 Atriplex plant species belonged to C4 plant group and their photosynthetic pathway did not change with place changing during the growing period.
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