摘要
“无融合多胚苗”水稻Ｃ１００１Ｂ和它的杂种Ｃ１００１Ｂ×Ｃ１００１Ａ 的未成熟颖果１５００ 粒；田间和人工萌发的单苗、双苗和三苗实生苗共２７０２ 株进行了形态解剖观察，结果如下：１．Ｃ１００１Ｂ和它的杂交颖果中只含一个胚；２． 由单个胚萌发的双苗和三苗幼苗是多苗实生苗。双苗实生苗的侧苗１ 和三苗实生苗的侧苗１ 是由主苗基部胚芽鞘的腋芽所形成，侧苗２由侧苗１ 基生叶的腋部发育而来。因此，多苗实生苗系同一个胚发育的主苗及其腋芽系统所组成；３． 颖果中胚的位置和朝向的变化和侧苗生长的两种类型，导致主苗与侧苗位置上的不同。至于已报道的水稻“多胚苗”形成的无融合生殖类型和推测尚有待提出胚胎学的论据。
The formation of the so called polyembryonic seedling and its morphology were observed.The main conclusions are as follows: 1.All caryopses contain only one embryo; 2.“The polyembryonic seedling” reported is actually single seedling with 1 or 2 lateral shoots sprouted from the main shoot.The first lateral shoot arises from the axil of coleoptile and the second one from the axil of lower leaf in the first lateral shoot.These lateral shoots are not independent seedlings.The formation of lateral shoot in wheat is the same as that of rice as mentioned above.The authors had dissected 1500 rice caryopses, 1600 young seedlings from the field and 1102 seedlings germinated under artificial conditions.Thus, polyembryonic seedlings as preriously reported is not present, at least, in rice C1001B line.
基金
中国科学院院长基金
中国科学院植物研究所所长基金资助
关键词
水稻
多胚苗
多胚
形态学
Rice Wheat
Polyembryonic seedling
Seedling with lateral shoot
