Reduced Growth Rate and Changes in Cell Wall Proteins of Plant Cells Adapted to NaCl
Plant cells which are exposed to sufficient osmotic stress will lose turgor and stop growing. However, within limits plant cells will osmotically adjust to such stress and restore turgor but growth remains inhibited. We have hypothesized that osmotically adapted cells have restricted growth rates because of alterations in cell wall metabolism. We demonstrate here that the amounts of hydroxyproline rich glycoproteins are greatly reduced in adapted cells and, hence, cannot be involved in restricted growth. Adapted cells do have an altered pattern of ionically-bound cell wall proteins and proteins released outside of the cell. Any role of these protein changes in restricting cell growth remains to be proven. Plants regenerated from adapted cells exhibit a genetically stable reduction in leaf cell enlargement rate. Alterations in cell wall properties of these leaf cells remain to be determined.
KeywordsOsmotic Adjustment Desiccation Stress Cell Wall Protein Reduce Growth Rate Hydroxyproline Content
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