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Effects of Water Stress on Starch and Sucrose Metabolism in Cotton Leaves
Author(s) -
Chang Ch. W.,
Ryan R. D.
Publication year - 1987
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.19870390305
Subject(s) - sucrose , starch , sucrose phosphate synthase , metabolism , chloroplast , amylase , sucrose synthase , carbohydrate metabolism , chemistry , enzyme , biochemistry , photosynthesis , water stress , biology , botany , invertase , gene
Abstract Studies of starch and sucrose metabolism as influenced by water stress in cotton plants ( Gossypium hirsutum L.) have been meager. Therefore, metabolic enzyme activities and metabolites from well hydrated control and partially dehydrated plants were analyzed. Water stress decreases cotton leaf starch content directly by enhancing α‐amylase activity and indirectly by altering sucrose metabolism. In inhibition of sucrose synthetase causes an sucrose in the cytoplasm and also contributes to excess orthophosphate amassment in the chloroplasts. Orthophosphate inhibits ADP‐glucose pyrophosphorylase activity which is responsible for starch synthesis in the chloroplasts. The generally accepted metabolic relationship that leaf starch content is indirectly controlled by sucrose phosphate synthase activity was not observed.