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Polyamines Involved in Regulating Self-Incompatibility in Apple

文献类型： 外文期刊

作者： Yu, Jie 1 ; Wang, Baoan 1 ; Fan, Wenqi 1 ; Fan, Songbo 1 ; Xu, Ya 1 ; Liu, Chunsheng 1 ; Lv, Tianxing 2 ; Liu, Wanda 3 ; Wu, 1 ;

作者机构： 1.China Agr Univ, Coll Hort, Beijing 100193, Peoples R China

2.Liaoning Acad Agr Sci, Inst Pomol, Yingkou 115009, Peoples R China

3.Heilongjiang Acad Agr Sci, Hort Branch, Harbin 150000, Peoples R China

关键词： polyamines; apple; self-incompatibility; S-RNase; pollen tube

期刊名称：GENES （ 影响因子：4.096； 五年影响因子：4.339 ）

ISSN：

年卷期： 2021 年 12 卷 11 期

页码：

收录情况： SCI

摘要： Apple exhibits typical gametophytic self-incompatibility, in which self-S-RNase can arrest pollen tube growth, leading to failure of fertilization. To date, there have been few studies on how to resist the toxicity of self-S-RNase. In this study, pollen tube polyamines were found to respond to self-S-RNase and help pollen tubes defend against self-S-RNase. In particular, the contents of putrescine, spermidine, and spermine in the pollen tube treated with self-S-RNase were substantially lower than those treated with non-self-S-RNase. Further analysis of gene expression of key enzymes in the synthesis and degradation pathways of polyamines found that the expression of DIAMINE OXIDASE 4 (MdDAO4) as well as several polyamine oxidases such as POLYAMINE OXIDASES 3 (MdPAO3), POLYAMINE OXIDASES 4 (MdPAO4), and POLYAMINE OXIDASES 6 (MdPAO6) were significantly up-regulated under self-S-RNase treatment, resulting in the reduction of polyamines. Silencing MdPAO6 in pollen tubes alleviates the inhibitory effect of self-S-RNase on pollen tube growth. In addition, exogenous polyamines also enhance pollen tube resistance to self-S-RNase. Transcriptome sequencing data found that polyamines may communicate with S-RNase through the calcium signal pathway, thereby regulating the growth of the pollen tubes. To summarize, our results suggested that polyamines responded to the self-incompatibility reaction and could enhance pollen tube tolerance to S-RNase, thus providing a potential way to break self-incompatibility in apple.

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