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以早稻(Upland rice)“旱稻65(Oryza sativa L.)”为母本,“长芒稗(Echinochloa caudata)”为父本进行远缘杂交,对杂种后代连续3年田间试验表明:F_0代高度杂交不孕,去雄约800朵小花田间多次重复授粉结果,结实率仅为1.21‰。F_1代杂种优势明显,育性正常,结实率92.26％,不存在后代不育现象。F_2代在芒性、株高、穗长、一级技梗数、穗粒数及生育期等性状上分离严重,但育性无分离,405株群体无不育株出现。目前已选育出生育期较母本早5d的大穗、多粒变异单株F_2-1。该单株在稀植条件下,一级枝梗数11.5个,穗粒数112粒,穗结实粒数104粒,千粒重27.5g,单株生产力10.73g,超亲优势为55.64％。
The distant hybridization was carried out using Upland rice “Oryza sativa L.” as the female parent and “Echinochloa caudata” as the male parent for three years continuous field experiments of hybrid progenies: F 0 generation height Hybridization infertility, ovulation about 800 flower fields repeated pollination results, seed setting rate of only 1.21 ‰. The F_1 hybrids had obvious advantages in heterosis, normal fertility, seed setting rate 92.26%, and no offspring infertility. F_2 generation was severely separated in mantle, plant height, spike length, number of primary spikelets, number of spikelets per panicle and growth period. However, no fertility was found in 405 plants. At present, the big spike and multi-grain mutant F_2-1 have been bred in the first five days earlier than the female parent. Under the condition of rare planting, the number of primary branches was 11.5, the number of spikelets was 112, the number of spikelets was 104, the weight of thousand seeds was 27.5g, the productivity per plant was 10.73g and the super-relative advantage was 55.64%.