Metabolomics reveals a key role of salicylic acid in embryo abortion underlying interspecific hybridization between Hydrangea macrophylla and H. arborescens

文献类型： 外文期刊

第一作者： Feng, Jing

作者： Feng, Jing;Chen, Shuangshuang;Chen, Huijie;Dai, Linjian;Qi, Xiangyu;Ahmad, Muhammad Zulfiqar;Jin, Yuyan;Deng, Yanming;Dai, Linjian;Deng, Yanming;Gao, Kai;Qiu, Shuai

作者机构：

关键词： Interspecific hybridization; Pollen tube; Embryo abortion; Metabolomics; Hydrangea; Reproductive barrier

期刊名称：PLANT CELL REPORTS （ 影响因子：4.5； 五年影响因子：6.1 ）

ISSN： 0721-7714

年卷期： 2024 年 43 卷 10 期

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收录情况： SCI

摘要： Difficulties in obtaining seeds from interspecific hybridization between Hydrangea macrophylla and H. arborescens had severely restricted the process of breeding new hydrangea varieties. To clarify the cause of reproductive barriers, an interspecific hybridization was made between H. macrophylla 'Endless Summer' (female parent) and H. arborescens 'Annabelle' (male parent). The results showed that both parents' floral organs developed normally, 'Annabelle' had high pollen viability (84.83% at 8 h after incubation), and the pollen tube could enter into the ovule of 'Endless Summer' at 72 h after pollination. Therefore, the pre-fertilization barrier was not the main reason for the failure of interspecific hybridization. However, observation of the embryo development by paraffin sections showed that the embryo was aborted at the heart-shaped stage. In addition, salicylic acid (SA) content was significantly higher (fourfold, P < 0.01) at 21 days after pollination (DAP) as compared to that of 17 DAP, which means SA may be closely correlated with embryo development. A total of 957 metabolites were detected, among which 78 were significantly different. During the embryo abortion, phenylpropanoids and polyketides were significantly down-regulated, while organic oxygen compounds were significantly up-regulated. Further analysis indicated that the metabolic pathway was enriched in the shikimic acid biosynthesis pathway, which suggests that more SA was synthesized. Taken together, it can be reasonably speculated that SA plays a key role leading to embryo abortion underlying the interspecific hybridization between Hydrangea macrophylla and H. arborescens. The result is helpful to direct the breeding of hydrangea through distant hybridization.

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