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Morphogenesis of Stamens and Petaloid Stamens in Lilium hybrid 'Red Twin' under Different Temperatures and the Expression Characteristics of Two AGAMOUS-like Genes Linked to These Processes

文献类型： 外文期刊

作者： Li, Xin 1 ; Wang, Zhen 1 ; Chen, Minmin 1 ; Yang, Liuyan 1 ; Zhang, Yongchun 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Forest & Fruit Tree Res Inst, Shanghai 201400, Peoples R China

关键词： Lilium; double flower; petaloid stamens; morphogenesis; temperature; AGAMOUS-like genes

期刊名称：HORTICULTURAE （ 影响因子：2.923； 五年影响因子：3.582 ）

ISSN：

年卷期： 2022 年 8 卷 12 期

页码：

收录情况： SCI

摘要： The double-flowered lily 'Red Twin', in which stamens are transformed into petaloid organs, sometimes exhibits normal stamens owing to an unknown mechanism and thus greatly affecting its commercial quality. In this study, the morphogenesis of stamens and petaloid stamens in this cultivar grown under different temperature treatments were investigated. Two AGAMOUS-like genes were isolated and their expression levels were analyzed. The results showed that relatively high temperatures induced the morphogenesis of stamens, while relatively low temperatures promoted petaloidy in 'Red Twin'. The stage with 1-6 mm flower buds was identified as the critical development period for stamen morphogenesis; furthermore, keeping the flower buds under relatively low temperatures in the 1-3 or 3-6 mm stages would be sufficient for the formation of petaloid stamens to a high degree. In addition, LrtAG1 and LrtAG2 showed the highest expression level in whorls 3 and 4 of 3-6 mm flower buds, respectively. LrtAG1 showed a higher reduction ratio than LrtAG2 when the flower buds were transferred to low temperature, implying that the decreased LrtAG1 expression level is associated with low temperature and might be correlated with the petaloidy of the stamens.

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