Journal
PROTEOMICS
Volume 12, Issue 12, Pages 1983-1998Publisher
WILEY
DOI: 10.1002/pmic.201100407
Keywords
2DE; Nicotiana tabacum; Plant proteomics; Stigma; Zea Mays
Funding
- Ministry of Science and Technology of China [2007CB947600]
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Angiosperm stigma supports compatible pollen germination and tube growth, resulting in fertilization and seed production. Stigmas are mainly divided into two types, dry and wet, according to the absence or presence of exudates on their surfaces. Here, we used 2DE and MS to identify proteins specifically and preferentially expressed in the stigmas of maize (Zea Mays, dry stigma) and tobacco (Nicotiana tabacum, wet stigma), as well as proteins rinsed from the surface of the tobacco stigma. We found that the specifically and preferentially expressed proteins in maize and tobacco stigmas share similar distributions in functional categories. However, these proteins showed important difference between dry and wet stigmas in a few aspects, such as protein homology in signal transduction and lipid metabolism, relative expression levels of proteins containing signal peptides and proteins in defense and stress response. These different features might be related to the specific structures and functions of dry and wet stigmas. The possible roles of some stigma-expressed proteins were discussed. Our results provide important information on functions of proteins in dry and wet stigmas and reveal aspects of conservation and divergence between dry and wet stigmas at the proteomic level.
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