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一些植物病理学家和育种学家认为,影响育性的细胞质因素是某些类似病毒的实体。因此,许多人用玉米、矮牵牛、甜菜等作物做嫁接试验—把保持系嫁接在雄性不育系上,希望通过胞间连丝把染色体外不育的遗传物质传递给接穗,以证明雄性不育的类病毒学说。Curtis(1967)将一年生雄性不育的甜菜和相应的O型系相互嫁接,大部分保持系接穗上出现了雄性不育花,即使一些花未能表现雄性不育,其后代也多数出现不育。Theurer(1968)、Cheij(1967)、R·lichter(1978)均进行了同样的工作,却没能得到和Curtis相同的结果。
Some plant pathologists and breeders believe that cytoplasmic factors that affect fertility are certain virus-like entities. Therefore, many people use grafting experiments with crops such as corn, petunia and sugar beet - grafting the maintainer line onto the male sterility line in the hope of passing the extra-chromosomal infertile genetic material to the scion via the mesophyllous line to prove that the male Sterile virus-like theory. Curtis (1967) grafted the annual male-sterile sugar beet and the corresponding O-type into each other. Most of the maintainer lines had male-sterile flowers. Even though some flowers failed to show male sterility, most of their offspring also appeared infertile . Theurer (1968), Cheij (1967), and R. Lichter (1978) did the same work without the same results as Curtis.