Developmental regulation in cotton cell wall proteins under different thermal environments
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Two cotton racestocks, T25 and T169, respond to drought stress differently. In the field, T25 leaves remain turgid whereas T169 leaves wilt under environmental stress. T25 is considered to be a drought tolerant cotton line, whereas T169 a drought susceptible cotton line. The complexity of plant responses to heat and/or drought stress make it difficult to study and identify the individual parameters which relate to heat and/or drought tolerance at the whole plant level. Tissue and cell culture systems provide a defined system to either impose two or more stresses simultaneously or separately to study the effects of stress on cell growth at the cellular level. Expansive growth of higher plant cells is known to be very sensitive to drought and heat stresses. Cell wall proteins (CWP) have been reported to be related to cell wall extensibility and growth. The purpose of this study was to investigate at the cellular level the effects of thermal stress on regulation of cell growth, CWP accumulation, and peroxidase (an important cell wall protein) isozyme patterns during growth of cell suspension cultures of these two cotton racestocks. Cell suspension cultures derived from hypocotyl-induced calli were used in this study.