Abstract
Angiosperms have developed self-incompatibility (SI) systems to reject self-pollen, thereby promoting outcrossing. The Brassicaceae belongs to typical sporophytic system, having a single S-locus controlled SI response, and was chosen as a model system to study SI-related intercellular signal transduction. In this regard, the downstream factor of EXO70A1 was unknown. Here, protein two-dimensional electrophoresis (2-DE) method and coupled with matrix-assisted laser desorption ionization/time of flight of flight mass spectrometry (MALDI-TOF -MS) and peptide mass fingerprinting (PMF) was used to further explore the mechanism of SI responses in Brassica oleracea L. var. capitata L. at protein level. To further confirm the time point of protein profile change, total proteins were collected from B. oleracea pistils at 0 min, 1 h, and 2 h after self-pollination. In total 902, 1088 and 1023 protein spots were separated in 0 min, 1 h and 2 h 2-DE maps, respectively. Our analyses of self-pollination profiles indicated that proteins mainly changed at 1 h post-pollination in B. oleracea. Moreover, 1077 protein spots were separated in cross-pollinated 1 h (CP) pistil 2-DE map. MALDI-TOF-MS and PMF successfully identified 34 differentially-expressed proteins (DEPs) in SP and CP 1 h 2-DE maps. Gene ontology and KEGG analysis revealed an array of proteins grouped in the following categories: stress and defense response (35%), protein metabolism (18%), carbohydrate and energy metabolism (12%), regulation of translation (9%), pollen tube development (12%), transport (9%) and cytoskeletal (6%). Sets of DEPs identified specifically in SP or only up-regulated expressed in CP pistils were chosen for funther investigating in floral organs and during the process of self- and cross-pollination. The function of these DEPs in terms of their potential involvement in SI in B. oleracea is discussed.
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Abbreviations
- SI:
-
Self-incompatibility
- 2-DE:
-
Two-dimension electrophoresis
- MALDI-TOF-MS:
-
Matrix assisted laser desorption/lionization time of flight mass spectrometry
- PMF:
-
Peptide mass fingerprinting
- SP:
-
Self-pollinated
- CP:
-
Cross-pollinated
- DEPs:
-
Differentially-expressed proteins
- KEGG:
-
Kyoto encyclopedia of genes and genomes
- SCR:
-
S-locus cysteine rich protein
- SRK:
-
S-locus receptor kinase protein
- SLG:
-
S-locus glycoprotein protein
- ARC1:
-
Armadillo repeat containing 1
- EXO70A1:
-
Exocyst 70 A1
- MLPK:
-
M-locus protein kinase protein
- THL1/THL2:
-
Thioredoxin-h-like proteins
- TCA:
-
Trichloroacetic acid
- CHAPS:
-
3-cholamidopropyl dimethylammonio propanesulfonate
- DTT:
-
Dithiothreitol
- IEF:
-
Isoelectric focusing
- SDS-PAGEs:
-
Sodium dodecyl sulfate polyacrylamide gels
- SD:
-
Standard deviation
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We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled. And this article does not contain any studies with human participants or animals performed by any of the authors.
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Jing Zeng, Qiguo Gao authors have contributed equally to this work.
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Zeng, J., Gao, Q., Shi, S. et al. Dissecting Pistil Responses to Incompatible and Compatible Pollen in Self-Incompatibility Brassica oleracea Using Comparative Proteomics. Protein J 36, 123–137 (2017). https://doi.org/10.1007/s10930-017-9697-y
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DOI: https://doi.org/10.1007/s10930-017-9697-y