Linked Life Data

10938866

Source:http://linkedlifedata.com/resource/pubmed/id/10938866

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
345
pubmed:dateCreated
2000-9-1
pubmed:abstractText
Cotyledons detached from 4-d-old cucumber (Cucumis sativus L.) seedlings were subjected to water stress (air-drying or PEG-treatment) to examine the effects of the stress on carbohydrate metabolism. Amylolytic activity in the cotyledon was increased about 6-fold by water stress within 1 d. The substrate specificity and the action pattern indicated that beta-amylase is responsible for the activity. Activities of azocaseinase, malate dehydrogenase and triose-phosphate isomerase were not affected by water stress, indicating that the effect of the stress on beta-amylase is rather specific. Cycloheximide-treatment strongly reduced the enhancement of beta-amylase activity. The hypocotyl of cucumber seedlings also exhibited an increase in the enzyme activity when subjected to water stress. The major free sugars in cucumber cotyledons were glucose, fructose, maltose, and sucrose; sucrose being the most abundant. Sucrose content in excised, unstressed cotyledons increased markedly during the incubation. Changes in other free sugars were small compared with that of sucrose. Starch also accumulated in unstressed cotyledons. In stressed cotyledons more sucrose and less starch accumulated than in unstressed ones. Such results were discussed in relation to the enhancement of beta-amylase activity.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0022-0957
pubmed:author
pubmed:issnType
Print
pubmed:volume
51
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
739-45
pubmed:dateRevised
2001-11-14
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Water stress enhances beta-amylase activity in cucumber cotyledons.
pubmed:affiliation
Department of Regulatory Biology, Faculty of Science, Saitama University, Japan.
pubmed:publicationType
Journal Article