Abstract
(1) The time interval from anthesis to fertilization under field conditions were found to be different for varieties. Ingeneral the early varieties require long periods, but anthesis in late varieties was completed in less time. (2) After the first cell division of the proembryos, some varietal differences in the length and thickness may be ricognized, but little in the degree of development of the each organ. (3) In almost varieties the first cell division of the proembryos was completed about 24∼48 hours after self pollination or anthesis. (4) The first sign of differentiation of the rudiments of each organ in the proembryos occurs 7∼11 days after anthesis; the length of the embryo is then 0.30∼0.55 mm., and the thickness 0.13∼0.18 mm. Fair differences have been observed in each variety. (5) About 8∼12 days after anthesis the development of the coleoptile ie is seen. (6) The rudiment of the first foliage leaf may be seen 8∼12 days after anthesis, when the embryo is 0.44∼1.10 mm. long, and 0.15∼0.35 mm. thick. The differences between varieties are then very marked. (7) By the time the embryo has reached a length of about 1.13∼2.54 mm. 11∼20 days after anthesis, the rudiment of the second foliage leaf appears. (8) The rudiment of the third foliage leaf may be seen at 15∼25 days old after anthesis, when the embryo is 2.02∼2.96 mm. long, and 0.53∼0.98 mm. thick. (9) At the time of 25∼40 days old after anthesis the rudiment nf the fourth foliage leaf appears. (10) The origin of the first seminal root is seen about 7∼12 days after anthesis. (11) At about 12∼20 days old after anthisis, the scutellum develops as the scute form, and the epithelial layer of the scutellum forms its orginal shape about 17∼20 days after anthesis. (12) About 25∼28 days after anthesis, all organs of the embryo are completely differentiated; they grow perfectly 30∼35 days after anthesis. (13) On the full formed embryos or full ripened grains, varietal difference has been observed such as the length and thickness of embryo within the scope of variation as 2.66∼3.18 mm. in length, and 0.83∼1.12mm, in thickness. (14) Varietal differences of these organs differentiation ort growth may be observed within the scope of these variations in the length and thickness of the embryo or the number of days after anthesis. (15) On the full ripened grains, three or four foliage leaves are differentiated near the stem apex. But in almost varieties four leaves may be observed. (16) Varietal differences have been observed on the growth at the upper part of embryo -length from the cotyledonaly node or hypocotyl to the coleoptle apex, and the number of seminal root in radial longitudinal sections. And the seminal root is seen one, two or three. These are the most conspicuous difference on the full formed embryo.
