Yasunaga Iwasaki

Nitrogen Accumulation in the Inferior Spikelet of Rice Ear during Ripening

Abstract Nitrogen accumulation in the apical spikelet of the top primary branch (superior spikelet) and the second spikelet of the lowest secondary branch (inferior spikelet), of the ear on the main stem of rice plant (Oryza sativa L. var. Sasanishiki) was characterized during grain filling. In the superior spikelet, the accumulation of dry matter and nitrogen which started immediately after lowering, proceeded rapidly, and reached the maturation level at 20 d after heading. In the inferior spikelet, however, the amount of dry matter and nitrogen accumulation was minimal immediately after flowering. It increased when grain filling of the superior spikelet was almost completed. 15N-labeled ammonia was administered to the plants at different stages of ripening and the amount of incorporation in the spikelets was analyzed at harvest. The labeled nitrogen administered at the early stages of ripening was the main source of the labeled nitrogen incorporated in the superior spikelet. However, the labeled nitroge...

Glutelin accumulation and changes in the levels of its mRNA in the superior and inferior spikelets of rice ear during ripening

Glutelin accumulation in the apical spikelet of the top primary branch (superior spikelet) and the second spikelet of the lowest secondary branch (inferior spikelet) of the ear of the rice plant (Oryza sativa L.) was characterized during grain filling.

Outline of international symposium on growing media

(pp. 129)