Distinct genetic regulation of flowering time and grain-filling period based on empirical study of D-genome diversity in synthetic hexaploid wheat lines
Distinct genetic regulation of flowering time and grain-filling period based on empirical study of D-genome diversity in synthetic hexaploid wheat lines
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DOI：
10.1270/jsbbs.61.130
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发表时间：
2011-06-01
期刊：
影响因子：
2.4
通讯作者：
Takumi, Shigeo
中科院分区：
文献类型：
--
作者：
Kajimura, Tomonori;Murai, Koji;Takumi, Shigeo
节节麦，六倍体小麦的D-基因组祖先，在欧亚大陆中部具有广泛的物种范围。在AC中的大的自然变化。tauschii为改良现代普通小麦品种提供了潜力。成熟期是小麦育种的重要农艺性状，与开花期和灌浆期密切相关。在这里，我们建立了82个小麦合成系，通过核内复制，形成三倍体配子，在种间杂种杂交获得的四倍体小麦品种，兰登，与69 Ac。桃木属的加入。六倍体合成材料的经验研究表明，丰富的变化在整个两个生长季节检查的抽穗，开花，成熟时间和灌浆期。抽穗期变异较大。在合成小麦品系的六倍体背景中保持了节节麦。六倍体合成材料的抽穗、开花和成熟时间之间呈显着正相关。灌浆期与其它性状间相关不显著。在两个选择的具有相似开花时间的合成小麦品系之间的一些比较稳定地显示出它们的灌浆期的差异。这些观察结果表明，两个主要的遗传途径独立地决定小麦成熟时间，一个控制抽穗开花时间，另一个调节灌浆期。
Aegilops tauschii Coss., the D-genome progenitor of hexaploid wheat, has a wide species range in central Eurasia. Large natural variation in Ac. tauschii offers potential for improving modern varieties of common wheat. Maturation time, an important agronomic trait for wheat breeding, is tied to flowering time and grain-filling period. Here, we established 82 wheat synthetic lines derived through endoreduplication, forming triploid gametes, in interspecific hybrids obtained by crossing a tetraploid wheat cultivar, Langdon, with 69 Ac. tauschii accessions. Empirical study of the hexaploid synthetics showed abundant variation in heading, flowering, and maturation time and the grain-filling period throughout the two growth seasons examined. The wide variation observed in heading time in Ac. tauschii was maintained in the hexaploid background of the synthetic wheat lines. Significantly positive correlations were observed among heading, flowering, and maturation time in the hexaploid synthetics. On the other hand, no significant correlations were found between grain-filling period and the other traits examined. Some comparisons between two selected synthetic wheat lines having similar flowering time stably exhibited differences in their grain-filling periods. These observations suggest that two major genetic pathways independently determine wheat maturation time; one controls heading and flowering time and the other regulates grain-filling period.