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Effects of Water Stress on Starch and Its Metabolizing Enzyme Activities in Cotton Leaves
Author(s) -
Chang C. W.,
Wetmore J. A.
Publication year - 1986
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19860380907
Subject(s) - starch , amylase , water stress , chemistry , enzyme assay , enzyme , food science , glucan , degradation (telecommunications) , carbohydrate , horticulture , agronomy , botany , biology , biochemistry , telecommunications , computer science
Cotton plants were subjected to water stress ranging from –1.0 to –2.2 MPa. Starch content decreased during the initial decline in water potential from –1.1 to –1.4 MPa. This change was related to an increase in soluble α‐amylase activity and a decrease in bound glucan synthetase activity. Starch content then increased sharply to nearly 200% of control levels with a decrease in water potential to about –1.6 MPa. With a further reduction in leaf water potential to –2.2 MPa, both bound glucan synthetase activity and starch content decreased rapidly, while soluble α‐amylase activity continued to increase. The enzymic data demonstrate that effects of water stress on cotton are adverse, because starch degradation products are not translocated, but accumulate as reassembled starch in the source leaves.