HYBRIDIZATION BETWEEN THE SUNFLOWER SPECIES HELIANTHUS-ANNUUS AND H-PETIOLARIS
HYBRIDIZATION BETWEEN THE SUNFLOWER SPECIES HELIANTHUS-ANNUUS AND H-PETIOLARIS
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DOI：
10.2307/2405326
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发表时间：
1947-01-01
期刊：
影响因子：
3.3
通讯作者：
HEISER, CB
中科院分区：
文献类型：
--
作者：
HEISER, CB
黄花草和叶柄草是北美洲广布的杂草。在这两个种之间的杂交种群。对在3个地区发现的细菌进行了分析。将人工合成的杂交种与假定的天然杂交种进行比较，往往会表明后者确实是杂交起源的。单倍体染色体数为17，为首次报道。对杂交种的细胞学研究揭示了减数分裂的不规则性，因此杂交种高度不育。2个种之间的杂交。似乎导致了入渗，这大大增加了2种种质的变异性。没有任何融合成单一高度可变物种的趋势。在创造优良的基因类型方面，导入可能是重要的，这进一步提高了2个种的能力。像野草一样散布。
H. annuus and H. petiolaris are wide-spread weeds in N. America. Hybrid swarms between the 2 spp. which have been found in 3 localities are analyzed. Comparison of the synthetic with the putative natural hybrids tends to indicate that the latter are truly of hybrid origin. The haploid chromosome number of 17 for H. petiolaris is reported for the first time. Cytological studies of the hybrid have revealed irregularities at meiosis and consequently the hybrid is rather highly sterile. Hybridization between the 2 spp. appears to have resulted in introgression which has greatly increased the variability of the 2 spp. without any tendency for fusion into a single highly variable species. Introgression may have been of importance in creating superior genotypes which have furthered the ability of the 2 spp. to spread as weeds.