Decreased sorbitol synthesis leads to abnormal stamen development and reduced pollen tube growth via an MYB transcription factor, MdMYB39L, in apple (Malus domestica)
文献类型： 外文期刊
作者： Meng, Dong 1 ; He, Mingyang 1 ; Bai, Yang 3 ; Xu, Hongxia 1 ; Dandekar, Abhaya M. 5 ; Fei, Zhangjun 3 ; Cheng, Lailian 1 ;
作者机构： 1.Cornell Univ, Sch Integrat Plant Sci, Sect Hort, Ithaca, NY 14853 USA
2.Southwest Univ, Citrus Res Inst, Chongqing 400712, Peoples R China
3.Boyce Thompson Inst Plant Res, Ithaca, NY USA
4.Zhejiang Acad Agr Sci, Hangzhou 310021, Zhejiang, Peoples R China
5.Univ Calif Davis, Dept Plant Sci, Davis, CA 95616 USA
关键词： apple (Malus domestica);flower development;MYB;pollen tube growth;sorbitol
期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）
ISSN： 0028-646X
年卷期： 2018 年 217 卷 2 期
页码：
收录情况： SCI
摘要： Sugars produced by photosynthesis not only fuel plant growth and development, but may also act as signals to regulate plant growth and development. This work focuses on the role of sorbitol, a sugar alcohol, in flower development and pollen tube growth of apple (Malus domestica). Transgenic 'Greensleeves' apple trees with decreased sorbitol synthesis had abnormal stamen development, a decreased pollen germination rate and reduced pollen tube growth, which were all closely related to lower sorbitol concentrations in stamens. RNA sequencing and quantitative RT-PCR analyses identified reduced transcript levels during stamen development and pollen tube growth in the transgenic trees of a stamen-specific MYB39-like transcription factor, MdMYB39L, and of its putative target genes involved in hexose uptake, cell wall formation and microsporogenesis. Suppressing MdMYB39L expression in pollen via antisense oligonucleotide transfection significantly reduced the expression of its putative target genes and pollen tube growth. Exogenous sorbitol application during flower development partially restored MdMYB39L expression, stamen development, and pollen germination and tube growth of the transgenic trees. Addition of sorbitol to the germination medium also partially restored pollen germination and tube growth of the transgenic trees. We conclude that sorbitol plays an essential role in stamen development and pollen tube growth via MdMYB39L in apple.
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