The genetic basis of a mutation that alters the floral symmetry in sunflower
The genetic basis of a mutation that alters the floral symmetry in sunflower
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DOI：
10.1111/j.1744-7348.2003.tb00303.x
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发表时间：
2003-01-01
影响因子：
2.6
通讯作者：
Pugliesi, C
中科院分区：
文献类型：
--
作者：
Fambrini, M;Bertini, D;Pugliesi, C
向日葵的不定花序是异花授粉的，花冠外轮具有左右对称的放射状花朵，花盘呈弧形排列，从花冠中心向外辐射。菊花(CHRY)突变体的特征是将管状盘花的径向对称的花冠转变为单对称的舌状花冠。在花序周围轮生的花盘上的花盘中有明显的合形现象，而花序中心的单对称现象较少。虽然CHRY表型是已知的植物中最早的形态突变之一，但关于这一性状的遗传控制的研究很少，而且相互矛盾。我们的结果表明CHRY突变是半显性的，排除了母体的影响。此外，在F、V、BC和F3后代中收集的数据支持涉及一个主基因座和未知数量的修饰物的遗传模型。随着对CHRY突变基因控制知识的提高，在旨在培育新的观赏向日葵品种的杂交育种计划中应加强这一特性的引入。
The indeterminate inflorescence of sunflower (Helianthus annuus) is heterogamous with zygomorphic ray flowers in the outer whorl of the head and actinomorphic disc flowers arrayed in arcs radiating from the centre of the head. The Chrysanthemoides (Chry) mutant is characterised by a change of the radially symmetric corolla of tubular disc flowers into a monosymmetric ligulate-like corolla. Zygomorphy is pronounced in the disc flowers placed on the peripheral whorls of inflorescences, while the monosymmetry is less marked toward the centre of the inflorescence. Although the Chry phenotype was one of first known morphological mutants in plants, studies on the genetic control of this trait are scarce and contradictory. Our results indicate that the Chry mutation is semidominant and exclude a maternal influence. Moreover, the data gathered in F V BC, and F 3 progenies support a genetic model involving one major locus and an unknown number of modifiers. The improved knowledge on genetic control of the Chry mutation should enhance the introduction of this trait in crossbreeding programmes designed to produce new varieties of ornamental sunflower.