PbrCSP1, a pollen tube-specific cold shock domain protein, is essential for the growth and cold resistance of pear pollen tubes

文献类型： 外文期刊

第一作者： Zhu, Xiaoxuan

作者： Zhu, Xiaoxuan;Tang, Chao;Zhang, Ting;Zhang, Shaoling;Wu, Juyou;Wang, Peng;Zhu, Xiaoxuan;Tang, Chao;Wu, Juyou;Wu, Juyou

作者机构：

关键词： Pear; Pollen tube; Cold stress; Cold shock domain

期刊名称：MOLECULAR BREEDING （ 影响因子：3.1； 五年影响因子：3.1 ）

ISSN： 1380-3743

年卷期： 2024 年 44 卷 3 期

页码：

收录情况： SCI

摘要： Cold shock domain proteins (CSPs), initially identified in Escherichia coli, have been demonstrated to play a positive role in cold resistance. Previous studies in wheat, rice, and Arabidopsis have indicated the functional conservation of CSPs in cold resistance between bacteria and higher plants. However, the biological functions of PbrCSPs in pear pollen tubes, which represent the fragile reproductive organs highly sensitive to low temperature, remain largely unknown. In this study, a total of 22 CSPs were identified in the seven Rosaceae species, with a focus on characterizing four PbrCSPs in pear (Pyrus bretschneideri Rehder). All four PbrCSPs were structurally conserved and responsive to the abiotic stresses, such as cold, high osmotic, and abscisic acid (ABA) treatments. PbrCSP1, which is specifically expressed in pear pollen tubes, was selected for further research. PbrCSP1 was localized in both the cytoplasm and nucleus. Suppressing the expression of PbrCSP1 significantly inhibited the pollen tube growth in vitro. Conversely, overexpression of PbrCSP1 promoted the growth of pear pollen tubes under the normal condition and, notably, under the cold environment at 4 degrees C. These findings highlight an essential role of PbrCSP1 in facilitating the normal growth and enhancing cold resistance in pear pollen tubes.

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