玉米异位双胚与同位双胚籽粒的来源及其无融合生殖性

Formation of Estopic and Isotopic Double Double Embryo Grains in Maize and Their Apomixis

本文报道了在玉米自交系Ａ上发现的异位双胚粒和同位胚粒的来源与无融合生殖性．结果指出：１．异位双胚粒是一个异位单胚粒和一个正常单胚粒或者两个异位单胚粒在籽粒形成过程中合二为一形成的子房融合籽粒；２．同位双胚粒是合子胚在胚胎发育过程中一分为二裂生形成的孪生双胚籽粒；３．以紫胚玉米的紫胚等当代直感性状为标记性状测定了异位双胚粒与同位双胚粒的无融合生殖性，结果显示，异位双胚粒和同位双胚粒均不是无融合生殖体．

This paper is about the formation of estopic and isotopic double embryo grain of inbred line A in maize and their apomixis. The results are the following items:1. Extopic double embryo grain is the mixture of a estopic single embryo grain and a normal embryo grain.2. Isotopic double embryo grain is a disjunctive embryo grain through zygotic embryo cleavage during embryonic development.3. Estopic and isotopic double embryo grains are not ones of apoimxis when tested by using purple embryo-tip marker method.