PROTEOMIC ANALYSIS OF SIX DIFFERENT ORGANS OF RICE: COMPARISON OF ENZYMES INVOLVED IN PHOTOSYNTHESIS AND PRIMARY METABOLISM

摘要

In addition to green leaves, organs containing chlorophylls have the potential of photosynthesis. Although plants are classified into C_3, C4 and CAM plants according to the mechanism of their photosyn-thetic carbon assimilation in the leaves, other green organs do not always perform photosynthesis by the same mechanism as the leaves. Husk leaves of a C_4 plant maize show characteristics of C_3 photosynthesis (Langdale & Nelson 1991), and seed pods of C_3 dicots and spikelets of C_3 monocots have high enzyme activities associated with the C_4 photosynthetic pathway and perform C4-like photosynthesis, contributing significantly to grain filling (Imaizumi et al 1990, 1997, King et al 1998). Stems and petioles of celery and tobacco, typical C_3 plants, also show characteristics of C_4 photosynthesis (Hibberd & Quick 2002).