【摘要】 <正> 诱导同源四倍体栽培水稻oryza sativa L的研究工作是1951年开始的。同源四倍体和其原来的二倍体相比较,植株变矮,每穗粒数减少,粒子变大,结实率降低。粳型种的同源四倍体育性通常从百分之几到20%左右,比育性为50%左右的籼型同源四倍体低得多。众所周知,二倍体籼粳杂交的F₁植株是高度不育的,通常只有百分之几那样更多还原

【Abstract】 Nine tetraploid rice clones were tested in a yield performance trial with 3 replications and a plot area of 5.2m~2, Eive of these tested clones gave better yield than the two standard diploid varieties used as controls. The best clone V 049 reacheda yielding level of 7983 kg per hectare, i. e.12.6% higher than the better standard japonica variety Jing-Yie No.1.All the clones were derived from the hybrid progenies of tetraploid breeding nursery materials by means of tissue culture method. It is very difficult to develop stable tetraploid rice varieties from these elite plants in later generations, since the percentage of homozygous autotetraploid plants in a segregating progeny is extremely low, especially when polygenic alleles are involved.更多还原