The cell wall is an important sub-cellular organelle for the modulation of some stress signals and an important target of stress response-related changes in protein abundance. This review will be useful for clarifying the role of the cell wall of crops in response to environmental stresses. Furthermore, protein composition of the cell walls of rice, wheat, maize, and soybean are compared, and the role of cell wall proteins in crops under flooding and drought stress is discussed. In this review, the methods of purification and purity assays of cell wall protein fractions from crops are described, and the results of protein identification using gel-based and gel-free proteomic techniques are presented. To better understand the mechanisms underlying stress response in crops, cell wall proteomic analyses are being increasingly utilized. Crop cell wall proteomics is of particular importance for improving crop productivity, particularly under unfavorable environmental conditions. Abiotic and biotic stress factors markedly influence the geographical distribution and yields of many crop species.

Agricultural crops are often used for investigating stress tolerance because cultivars with differing degrees of tolerance are available.

2Plant Science Center, RIKEN Yokohama Institute, Yokohama, JapanĬell wall proteins play key roles in cell structure and metabolism, cell enlargement, signal transduction, responses to environmental stress, and many other physiological events.1National Institute of Crop Science, National Agriculture and Food Research Organization, Tsukuba, Japan.

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