Abstract
Oryza species were classified into three groups according to the type and levels of dipeptides containing d-alanine ( d-Ala) that are present in the plants. Type I plants contain high contents of d-alanylglycine ( d-Ala-Gly) and a low content of d-alanyl- d-alanine ( d-Ala- d-Ala). They form d-alanyl- l-alanine ( d-Ala- l-Ala) as well as d-Ala-Gly and d-Ala- d-Ala when d-Ala is fed. Cultivated rice plants belong to this group. Type II plants contain only d-Ala- d-Ala and they can be'further classified into IIa, IIb and IIc according to the amount of d-Ala- d-Ala they contained. They form only d-Ala- d-Ala even when d-Ala is fed. Type III plants do not contain any dipeptides containing d-Ala and they do not form any dipeptides containing d-Ala even when d-Ala is fed. Oryza coarctata, which is classified in the distant part of genus Oryza, belongs to this type.
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