Glycine metabolism and chlorophyll synthesis in barley leaves |
| |
Authors: | George AF Hendry Allan K Stobart |
| |
Institution: | Cell Metabolism Laboratory, Department of Botany, The University, Bristol BS8 1UG, England |
| |
Abstract: | α-Hydroxypyridine methane sulphonic acid (HPMS), isonicotinyl hydrazide (INH) and nialamide inhibit chlorophyll synthesis in etiolated barley leaves exposed to light. HPMS lowered the rate of protochlorophyllide regeneration but had little effect on the synthesis of protochlorophyll (P630) from exogenous -aminolaevulinic acid (ALA). The addition of glycine to HPMS treated leaves partially overcame the inhibition of chlorophyll synthesis. Glycine-14C] was readily incorporated into ALA in dark-grown leaves. HPMS treatment increased the sp. act. of ALA in leaves fed glycine-14C]. Glycollate oxidation was lower in extracts from HPMS treated leaves. Plants may therefore have two pathways for ALA production with the glutamate pathway becoming more important in conditions where photorespiration is high. |
| |
Keywords: | Gramineae barley leaves glycine α-hydroxypyridine methane sulphonic acid chlorophyll |
本文献已被 ScienceDirect 等数据库收录! |