Linked Life Data

12102516

Source:http://linkedlifedata.com/resource/pubmed/id/12102516

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
2002-7-9
pubmed:abstractText
Plants are often subjected to periods of soil and atmospheric water deficit during their life cycle. The frequency of such phenomena is likely to increase in the future even outside today's arid/semi-arid regions. Plant responses to water scarcity are complex, involving deleterious and/or adaptive changes, and under field conditions these responses can be synergistically or antagonistically modified by the superimposition of other stresses. This complexity is illustrated using examples of woody and herbaceous species mostly from Mediterranean-type ecosystems, with strategies ranging from drought-avoidance, as in winter/spring annuals or in deep-rooted perennials, to the stress resistance of sclerophylls. Differences among species that can be traced to different capacities for water acquisition, rather than to differences in metabolism at a given water status, are described. Changes in the root : shoot ratio or the temporary accumulation of reserves in the stem are accompanied by alterations in nitrogen and carbon metabolism, the fine regulation of which is still largely unknown. At the leaf level, the dissipation of excitation energy through processes other than photosynthetic C-metabolism is an important defence mechanism under conditions of water stress and is accompanied by down-regulation of photochemistry and, in the longer term, of carbon metabolism.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0305-7364
pubmed:author
pubmed:issnType
Print
pubmed:volume
89 Spec No
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
907-16
pubmed:dateRevised
2009-10-19
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
How plants cope with water stress in the field. Photosynthesis and growth.
pubmed:affiliation
Instituto Superior de Agronomia, Universidade Técnica Lisboa, Tapada da Ajuda, Portugal. mchaves@isa.utl.pt
pubmed:publicationType
Journal Article, Review