EVOLUTIONARY IMPLICATIONS OF SELF-COMPATIBILITY AND REPRODUCTIVE FITNESS IN THE APOMICTIC RANUNCULUS AURICOMUS POLYPLOID COMPLEX (RANUNCULACEAE).
EVOLUTIONARY IMPLICATIONS OF SELF-COMPATIBILITY AND REPRODUCTIVE FITNESS IN THE APOMICTIC RANUNCULUS AURICOMUS POLYPLOID COMPLEX (RANUNCULACEAE).
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DOI：
10.1086/591980
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发表时间：
2008-12
影响因子：
2.3
通讯作者：
Hörandl E
中科院分区：
文献类型：
--
作者：
Hörandl E
单代繁殖通常被认为有利于殖民化。在假配子体中，通过单个个体进行繁殖需要自花授粉，因此需要自交亲和性（SC）来生产可活的种子。通过授粉者排除试验、结实率评估和发芽率评估，研究了毛茛复合体二倍体和多倍体类群的SC和生殖适应性。有性生殖的适合度超过单合子和F1杂交种，但在不同年份之间的波动可能比单合子更大。二倍体有性类群及其F1杂交种是完全自交不亲和的。自体多倍体性细胞型也以SI为主，这可能限制了它们的范围扩展。在相当广泛的异源六倍体单聚体中观察到的SI的破坏可能是由于从半自亲和祖先遗传的初始部分SC和对SC基因型的强烈选择。结果表明，在存在异花授粉的情况下，有性生殖的高适应性可能有助于维持有性生殖群体，而单性生殖的高适应性可能在时空不稳定的环境和殖民化事件中具有优势。结果表明，与假配子无杂交有关的SC是观察到的孤雌生殖地理分布格局的重要因素。
Uniparental reproduction has often been regarded as advantageous for colonization. In pseudogamous a pomicts, reproduction via single individuals requires self-pollination and consequently self-compatibility (SC) for production of viable seeds. SC and reproductive fitness have been studied in diploid and polyploid taxa of the Ranunculus auricomus complex via pollinator exclusion tests, assessment of seed set, and germination rates. Reproductive fitness of sexuals exceeds that of apomicts and of F1 hybrids but may fluctuate more strongly between years than is the case in apomicts. Diploid sexual taxa and also their F1 hybrids are completely self-incompatible (SI). Auto-polyploid sexual cytotypes are also predominantly SI, which may have restricted their range expansion. The observed breakdown of SI in the rather widespread allohexaploid apomicts may be explained by initial partial SC inherited from semi-self-compatible ancestors and strong selection for SC genotypes. It is concluded that higher reproductive fitness of sexuals may help to maintain sexual populations when cross-pollination is available, whereas SC in apomicts may be advantageous in temporally and spatially unstable environments and also for colonization events. Results suggest that SC in connection with pseudogamous apomixis is an important factor for the observed distribution pattern of geographical parthenogenesis.
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影响因子：
1.5
作者：
Hörandl E;Cosendai AC;Temsch EM
通讯作者：
Temsch EM
影响因子：
3.3
作者：
LANDE, R;SCHEMSKE, DW
通讯作者：
SCHEMSKE, DW
影响因子：
3.9
作者：
Hörandl, E;Greilhuber, J;Dobes, C
通讯作者：
Dobes, C
影响因子：
1.9
作者：
Hörandl, E;Greilhuber, J
通讯作者：
Greilhuber, J
影响因子：
--
作者：
Hauck, NR;Yamane, H;Iezzoni, AF
通讯作者：
Iezzoni, AF