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Morpho-Physiological and Transcriptome Analyses Provide Insights into the Wizened Bud Formation in Pear Trees

文献类型： 外文期刊

作者： Du, Wei 1 ; Shi, Chunmei 2 ; Hussain, Syed Bilal 3 ; Li, Mingqiu 1 ; Fan, Jing 1 ; Chen, Qiliang 1 ; Zhang, Jingguo 1 ; Liu, Yongzhong 2 ; Yang, Xiaoping 1 ; Hu, Hongju 1 ;

作者机构： 1.Hubei Acad Agr Sci, Res Inst Fruit & Tea, Wuhan, Peoples R China

2.Huazhong Agr Univ, Key Lab Hort Plant Biol, Wuhan, Peoples R China

3.Univ Florida, Citrus Res & Educ Ctr, 700 Expt Stn Rd, Lake Alfred, FL USA

4.Hubei Hongshan Lab, Wuhan, Peoples R China

关键词： pear; wizened bud; cell wall loosening; pectin degradation; carbohydrate transport

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 2 期

页码：

收录情况： SCI

摘要： Wizened buds are frequently observed in pear (Pyrus spp.) trees, which greatly reduces the yield. However, little is known about the mechanism of wizened bud formation. Here, we analyzed physiological and transcriptomic differences between normal buds and wizened buds of '710' pear trees. The results indicated that the sorbitol and boron (B) contents, during bud differentiation, were significantly reduced in wizened buds. The microscopic observation and transcriptome analysis revealed that the collapse of the organ structure and cell wall loosening process may have a close relation with wizened bud formation. Moreover, reduced transcript levels of PpyMYB39.1 and its downstream genes (PpyHT1, PpyHT2, PpyPMEI1 and PpyPMEI2) were found in wizened buds. However, the transcript levels of pentose and glucuronate interconversion pathway genes (PpyPME3, PpyPL18.1, PpyPL18.2, PpyPG1 and PpyPG2) and the concentration of pectin-degradation-related enzymes were increased in wizened buds. Correspondingly, the pectin concentration was significantly reduced in wizened buds. Taken together, PpyMYB39.1 may promote pectin degradation and decrease carbohydrate transport by regulating its downstream genes and is supposed to play a vital role in the wizened bud formation resulting from the cell wall loosening process. Our study provides fundamental insights into wizened bud formation and strategies to reduce the wizened bud occurrence in pear trees.

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