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The effect of Cd 2+ on the biosynthesis of chlorophyll in leaves of barley
Author(s) -
Stobart Allan K.,
Griffiths W. Trevor,
AmeenBukhari Ibraheem,
Sherwood Robert P.
Publication year - 1985
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1985.tb04268.x
Subject(s) - protochlorophyllide , chlorophyll , hordeum vulgare , biosynthesis , enzyme , reductase , chemistry , biochemistry , botany , biology , poaceae , organic chemistry
The effect of cadmium on the biosynthesis of chlorophyll has been investigated in the leaves of dark‐grown seedlings of barley ( Hordeum vulture L. cv. Proctor). Cd2+ inhibited the production of chlorophyll by affecting 1) the synthesis of 5‐aminolacvulinic acid and 2) the protoehlorophyllide reductase ternary complex with its substrates. Cd2+ had no effect on the constituent enzymes that catalyse the synthesis of free protoehlorophyllide from 5‐aminolaevulinic acid. The results obtained are consistent with Cd2+ inhibiting the formation of chlorophyll by reacting with essential thiol groups in both the protochlorophyllide reductase protein and the enzyme(s) involved in the light dependent synthesis of 5‐aminolaevulinic acid.