FERTILITY OF BRACHIARIA-RUZIZIENSIS IN INTERSPECIFIC CROSSES WITH BRACHIARIA-DECUMBENS AND BRACHIARIA-BRIZANTHA - MEIOTIC BEHAVIOR, POLLEN VIABILITY AND SEED SET
FERTILITY OF BRACHIARIA-RUZIZIENSIS IN INTERSPECIFIC CROSSES WITH BRACHIARIA-DECUMBENS AND BRACHIARIA-BRIZANTHA - MEIOTIC BEHAVIOR, POLLEN VIABILITY AND SEED SET
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DOI：
10.1007/bf00039673
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发表时间：
1991-09-01
期刊：
影响因子：
1.9
通讯作者：
LOUANT, BP
中科院分区：
文献类型：
--
作者：
LUTTS, S;NDIKUMANA, J;LOUANT, BP
以秋水仙碱诱导的四倍体（2n = 4x = 36） ruzizibrachiaria为母本，与无融合四倍体（2n = 4x = 36） Brachiaria decumbens和brizantha杂交。四倍体褐花蓟马授粉后的结实率显著高于自交或与褐花蓟马杂交后的结实率。赤霉病白僵菌与卧枕白僵菌的亲和性也优于赤霉病白僵菌与白僵菌的亲和性。此外，杂交获得的杂交苗涉及红棘菊更经常是致命的。所有有活力的F，杂种都是四倍体，有36条染色体。减数分裂染色体行为表明这三个物种属于同一基因组群，因此具有相同的复合结构。中期染色体关联不能区分可育和不育杂种。种间杂交种的平均育力低于雌性亲本，但有些杂交种的育力高于无杂交的雄性亲本。
Colchicine induced tetraploid (2n = 4x = 36) Brachiaria ruziziensis were used as female parent in crosses with apomictic tetraploid species (2n = 4x = 36) Brachiaria decumbens and Brachiaria brizantha. Tetraploid B. ruziziensis pollinated with B. decumbens set significantly more seed than selfed or crossed with B. brizantha. The crossability between B. ruziziensis and B. decumbens is also better than between B. ruziziensis and B. brizantha. In addition, hybrid seedlings obtained in crosses involving B. brizantha are more frequently lethal. All the viable F, hybrids are tetraploid with 36 chromosomes. Meiotic chromosome behaviour suggest that the three species belong to the same genomic group and therefore the same agamic complex. Chromosome associations at metaphase I do not allow to identify fertile and sterile hybrids. The interspecific hybrids averaged a lower fertility than their female parent, but some hybrids were more fertile than their apomictic male parent.