摘要
Abstract
With mother trees of seed orchard located at Changlingang, Jianshi, Hubei, a research project has been carried out into the male cone and the female cone distribution in the tree crown, pollen production and ovule number for a different clone tree. The results showed that male cones were on 2 and 3 years' branches, there was a significant difference among different age branches for male cone number; there was also a significant difference among azimuth for male cone number; there was no significant difference for pollen production of a male cone among different clones, while there was a significant difference for ovule production of a female cone among different clones; the number of pollen produced per male cone was 168.9 × 103, per tree 40.93 × 106, and the whole seed orchard 1.473 × 1012; the number of ovule produced per female cone was 86.628, per tree 3539.280, the whole seed orchard 98.90 × 106 and the ratio of ovule to pollen l: 14.90 × 103; female cone diameter, female cone length, bract scale number, bract scale length, bract scale width, full seed number, Se-seed number and empty seed number were 24.961 mm, 27.432 mm, 44.694,10.773 mm, 9.8432 mm, 55.917, 6.889 and 5.217 respectively; there were significant difference or extremely significant difference for all of these characteristics among different clones; the seed output of orchard can be predicted according to the ovule number produc ed in this seed orchard.关键词
日本落叶松/无性系/配子产量/球果特征Key words
Larix kaempferi(Lamb. ) Carr/ clones/ gamete production/ cone characteristics分类
农业科技
