The content of β-N-oxalyl-L-α,β-diaminopropionic acid (ODAP) and the activity of glycolate oxidase (GO) were positively correlated in the leaves of grass pea (Lathyrus sativus L.) seedlings. The activity of GO was kept at a steady level under the high light after treatment with ODAP. Although Na2S can activate GO, it cannot maintain the activity of GO under the high light. The content of ODAP increased and the activity of GO decreased with increasing oxalate concentration used for seedling treatment. The GO activity was high enough to keep photosynthesis at a steady level under high light. These findings suggested that Lathyrus sativus, using oxalate as a precursor to produce ODAP, protected the GO activity at high irradiance by scavenging the hydroxyl radicals.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 11, 2004
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