(1) The fluctuating pattern ofD-alanylglycine content, although the increase and decrease rates were not very high, in the leaf blades of rice seedlings growing in light or dark was related to that of the chlorophyll content in the leaf blades. (2) TheD-alanylglycine content in the leaf blades of the chlorophyll-less cultivar was lower than that of the normal one. (3) Photosynthetically assimilated carbon was smoothly incorporated intoD-alanylglycine. (4) ExogenousD-alanine was only incorporated intoD-alanylglycine when theD-alanine feeding was performed under light. These results suggested thatD-alanylglycine synthesis in the leaf blades of rice plants is closely related to the amino acid metabolism accompanying photosynthesis in rice plants.
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