Sexual and vegetative reproduction in the aboveground part of a dioecious clonal plant, Dioscorea japonica (Dioscoreaceae)
Sexual and vegetative reproduction in the aboveground part of a dioecious clonal plant, Dioscorea japonica (Dioscoreaceae)
复制标题
DOI：
10.1007/s11284-005-0036-y
复制
发表时间：
2005-02
影响因子：
2
通讯作者：
Inoue Mizuki;K. Ishida;K. Kikuzawa
中科院分区：
文献类型：
--
作者：
Inoue Mizuki;K. Ishida;K. Kikuzawa
在雌雄异株的克隆植物中，结实所需的生殖努力将是雌性在有性生殖中更大投资的原因。如果有性生殖和克隆生殖之间存在资源分配的权衡，这种差异性的有性生殖将导致克隆生殖相对数量的性别差异。为了验证这一预测，我们研究了性别之间的差异，在他们的物候和投资，在有性生殖和营养生殖（通过球根克隆生殖）分株大小在雌雄异株克隆植物，rea japonica Thunb。珠芽产生期与果序发育期重叠。雌性开花晚，产生较重的花序，每花序花少比男性。使用个体植物的大小的回归分析表明，大女性在花序和较大的投资在有性生殖比大男性较小的投资。相比之下，女性投入较少的资源，营养繁殖比男性。然而，在有性生殖和无性生殖方面的总投资在两性之间没有差别。这些结果支持了我们关于有性生殖和克隆生殖中性分化的假说。
In dioecious clonal plants, the reproductive effort required to set seeds will be responsible for the larger investment in sexual reproduction by females. If there will be a trade-off in resource allocation between sexual and clonal reproduction, this differential sexual reproduction will lead to sexual differentiation in the relative amount of clonal reproduction. To test this prediction, we studied differences between the sexes in their phenologies and investments in sexual and vegetative reproduction (clonal reproduction by means of bulbils) with respect to ramet size in a dioecious clonal plant,Dioscorea japonicaThunb. The period of bulbil production overlapped the period during which infructescences developed. Females flowered later, produced heavier inflorescences, and fewer flowers per inflorescence than did males. Regression analysis using the size of the individual plants demonstrated that large females made smaller investments in inflorescences and larger investments in sexual reproduction than did large males. In contrast, females invested fewer resources in vegetative reproduction than did males. However, the total investments in sexual and vegetative reproduction did not differ between the sexes. These results supported our hypothesis on the sexual differentiation in sexual and clonal reproduction.