多胚水稻品系APⅣ胚囊的结构及其遗传多态性研究  

STUDY ON THE STRUCTURE AND GENETIC POLYMOR PHISM OF EMBRYO SAC IN POLYEMBRYONIC RICE STRAIN APⅣ

作　　者：刘向东[1] 卢永根[1] 徐雪宾[1] 徐是雄[2] 

机构地区：[1]华南农业大学农学系,广州510642 [2]香港大学植物学系

出　　处：《Acta Botanica Sinica》1996年第8期594-598,共5页Acta Botanica Sinica（植物学报：英文版）

摘　　要：通过 GMA半薄切片技术对多胚水稻 (Oryza sativa L.)品系 AP 和单胚水稻品种“IR36”的比较研究表明 :AP 中除了 7.8%的胚囊退化外 ,只有 2 7.1%的胚囊结构与“IR36”的相似 ,属蓼型结构 ;65.1%的与“IR36”不同 ,出现各种变异。其中主要的变异有两类 ,即多卵卵器胚囊 (53.3% )和双套结构胚囊 (6.3% )。多卵卵器胚囊中以三卵卵器胚囊为主。三卵卵器胚囊依胚囊的整体结构可分出 5- 2 - 1型、6- 2 - 0型和 5- 3- 0型等 3种类型的胚囊。双套结构胚囊主要特点是含有大小两个相套的胚囊和远离珠孔端的卵细胞。此外还观察到其它一些变异型胚囊。根据分析 ,发现 AP 胚囊结构类型在单穗内存在遗传多态性。By using the technology of GMA half section the comparative studies on the structure of embryo sac between polyembryonic rice strain APⅣ and haploembryonic rice cultivar “IR36” showed: In APⅣ, except 7.8% of ovaries in which the embryo sac degenerated, there were only 27.1% of ovaries in which the structure of embryo sac was similar to that of “IR36” which was of the Polygonum type; 65.1% of ovaries were different from “IR36”, in which some changes happened in the embryo sac. Of most two kinds of variant embryo sac, referred as poly egg apparatus embryo sac(53.3%) and double set of embryo sac (6.3%) were found. In the poly egg apparatus embryo sac, three egg apparatuses were the majority which could be further divided into three types, namely, 5 2 1 type, 6 2 0 type and 5 3 0 type, based on the whole structure of embryo sac. The double set of embryo sac characterized with a large embryo sac inlaid with a small embryo sac, and with the eggs far from the micropyle part. Moreover, the other variants were also found. According to the analysis, genetic polymorphism of the structure of embryo sac was found in single panicle in APⅣ.

关 键 词：水稻 胚胎学 多胚水稻品系 APⅣ 遗传多态性 

分 类 号：S511.103.2[农业科学—作物学]