Studies on the Ripening of Wheat Grain : 7. Developmeht of embryo with special reference to the differentiation of seminal roots.

[摘要] The differentiation and subsequent growth of seminal roots in the developing wheat embryo were investigated. At the 11th day after anthesis the primary seminal root was differentiated in the central portion of the embryo, when the coleoptile had already been initiated and the 1st foliage leaf was on the point of differentiation. At the 17th day, 2 days after the 2nd foliage leaf initiation, the 1st pair of seminal roots were initiated from the sides of the hypocotyl in a plane parallel to the face of the scutellum. At the 26th day, 2∼3 days after the 3rd foliage leaf initiation, the 2nd pair of seminal roots were initiated immediately above the 1st pair and in the same plane. On few cases the differentiation of the 6th seminal root from the middle point between the bases of the 2nd pair rootlets was observed at the 34th day. Most of the embryos, however, ceased their activity before the initiation of the 6th seminal root could be detected. The 3rd pair of seminal roots, whether their emergence occur after germination or otherwise, did not differentiate during the ripening stage of embryo. Based on these results the already recognized steps of embryo development were revised by including the developmental processes of seminal roots.

[学科分类] 农业科学（综合）