期刊
PLANT PHYSIOLOGY
卷 164, 期 4, 页码 1893-1904出版社
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.113.233387
关键词
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资金
- Chinese Ministry of Science and Technology [2011CB944600]
- Fudan University
- Rijk Zwaan
- Pennsylvania State University Department of Biology
- Huck Institutes of the Life Sciences
During angiosperm microsporogenesis, callose serves as a temporary wall to separate microsporocytes and newly formed microspores in the tetrad. Abnormal callose deposition and dissolution can lead to degeneration of developing microspores. However, genes and their regulation in callose metabolism during microsporogenesis still remain largely unclear. Here, we demonstrated that the Arabidopsis (Arabidopsis thaliana) CALLOSE DEFECTIVE MICROSPORE1 (CDM1) gene, encoding a tandem CCCH-type zinc finger protein, plays an important role in regulation of callose metabolism in male meiocytes and in integrity of newly formed microspores. First, quantitative reverse transcription PCR and in situ hybridization analyses showed that the CDM1 gene was highly expressed in meiocytes and the tapetum from anther stages 4 to 7. In addition, a transfer DNA insertional cdm1 mutant was completely male sterile. Moreover, light microscopy of anther sections revealed that microspores in the mutant anther were initiated, and then degenerated soon afterward with callose deposition defects, eventually leading to male sterility. Furthermore, transmission electron microscopy demonstrated that pollen exine formation was severely affected in the cdm1 mutant. Finally, we found that the cdm1 mutation affected the expression of callose synthesis genes (CALLOSE SYNTHASE5 and CALLOSE SYNTHASE12) and potential callase-related genes (A6 and MYB80), as well as three other putative beta-1,3-glucanase genes. Therefore, we propose that the CDM1 gene regulates callose metabolism during microsporogenesis, thereby promoting Arabidopsis male fertility.
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