Characterisation and evaluation of interspecific cross-incompatibility in two Delphinium species

文献类型： 外文期刊

第一作者： Cheng, Ying

作者： Cheng, Ying;Cheng, Ying;Li, Fan;Guan, Wenling

作者机构：

关键词： allogamic cross; compatibility; Delphinium; pollen-stigma interaction; reciprocal cross; reproduction

期刊名称：FOLIA HORTICULTURAE （ 影响因子：1.873； 五年影响因子：1.519 ）

ISSN： 0867-1761

年卷期： 2020 年 32 卷 2 期

页码：

收录情况： SCI

摘要： Delphinium yunnanense is an endemic species in the Yunnan Province of China, while Delphinium elatum 'Guardian Blue' is widespread as cut flowers in the world. They all bloom attractive blue flowers, which are a crucial ornamental trait for floriculture. In this experiment, the cross-compatibility between D. yunnanense and D. elatum was characterised and evaluated. The results showed that a strong cross-incompatibility was observed in D. yunnanense x D. datum, resulting in hybrid sterility. The F 1 hybrid generation produced neither fruits nor seeds. The cross-incompatibility of the hybrids resulted from the disturbed structure of the pollen tubes penetrating pistil style and callose deposits on stigma and in style. Moreover, the germination rate of D. elatum x D. yunnanense F, seed was lower than their own allogamic crosses, although there was no difference in fruit set rate. The results confirmed the cross-incompatibility between D. yunnanense and D. elatum, suggesting that D. elatum is more suitable as a maternal parent for hybridisation breeding. Our study characterised and evaluated the interspecific cross-compatibility through the pollen-stigma interaction and the reproductive system in Delphinium, which could provide the basis for the development and utilisation of potential ornamental traits in Delphinium.

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