再生稻幼穗分化形成规律及其应用的研究

1986—1987年在扬州对7个水稻品种茎秆上的再生芽进行幼穗分化观察。其结果表明,再生芽的幼穗分化始期在头季稻的雌雄蕊分化期至花粉母细胞形成期,约离头季稻抽穗20天左右。不同类型品种,其伸长节间各节位再生芽幼穗分化始期有差异,多数品种基部节上再生芽幼穗分化早,停滞时间也早而长,上部节上的再生芽幼穗分化迟,停滞时间晚而短。头季稻收割后不同类型品种各节位再生芽幼穗分化进程出现两种类型,一种类型为茎秆中间节上再生芽发育快,两头节上再生芽发育慢,另一种类型是随着伸长节间上升,各节位再生芽的幼穗分化进程也逐节相应加快。

Studies on Rule of Panicle Differentiation and its Application in Regeneration Rice

The observations on panicle differentiation of resting and regeneration buds on the stems of seven varieties were carried out in Yangzhou, Jiangsu province in 1986 and 1987.The results were summarized as follows: 1.The initiation of resting bud panicle, which was at both stages from the differentiating stage of pistil and stamens to pollen mother cell differentiation stage, and about 20 days before heading in the first crop rice, differed among different nod positions on the same stem. The lower the nod position was, the earlier was the panicle initiation. 2. The panicle differentiation process of resting buds on stems, which had entered the stage of secondary rachis-branches and the differentiating stage of spikelet primordia in the fastest developing resting buds in harvesting in the first crop rice, differed among different nod positions and among varieties. 3. After the harvesting of the first crop rice, the change of the panicle differentiating process of the regeneration buds on the different nod positions of internode took place because of nutrition, etc. In one group of vareties the panicles of the regeneration buds on the two middle nod positions,which differentiate at the fastest speed, had almost the same differentiating process. However, the panicle differentiating process of regeneratiod buds on the other nod positions was later. In another group of varieties, the higher the nod position was, the faster was the panicle differentiating speed of regeneration buds.