Linked Life Data

16662220

Source:http://linkedlifedata.com/resource/pubmed/id/16662220

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2010-6-29
pubmed:abstractText
The relative effects of water stress on growth parameters of subterranean clover (Trifolium subterraneum L. cv. Woogenellup) dependent on either N(2) or 8 millimolar NH(4)NO(3) for N were examined. Whole-plant carbon exchange rate (CER), acetylene reduction (AR), dry matter production, and Kjeldahl N accumulation were measured on uniform, intact swards of clover that were maintained under adequately watered conditions or were subjected to three cycles of water stress (leaf water potential </=-30 bar) over an 18-day period. In the absence or presence of water stress, growth rate, net N accumulation rate, and total N concentration of plants dependent on N(2) were 25 to 26, 45 to 50, and 20 to 21% less, respectively, than plants supplied with 8 millimolar NH(4)NO(3). The water stress treatment produced less than a 50% decrease in CER regardless of plant N source, a 90% inhibition of AR in plants dependent on N(2), and a 41% decline in dry matter production on both N sources. Water stress decreased reduced N accumulation 55% in N(2)-dependent plants and 50% in NH(4)NO(3)-dependent plants. Changes in growth and N accumulation caused a 10 to 11% decrease in total plant N concentration of water-stressed plants compared to adequately irrigated controls, but water stress decreased the N concentration of tissue synthesized during the 18-day treatment period in N(2)-grown plants more than in plants supplied 8 millimolar NH(4)NO(3). Thus, the relative effect of water stress on growth under the two N regimes was similar, but N accumulation by N(2)-dependent clover was inhibited to a slightly greater extent (P </= 0.001) than in NH(4)NO(3)-dependent plants.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Feb
pubmed:issn
0032-0889
pubmed:author
pubmed:issnType
Print
pubmed:volume
69
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
416-20
pubmed:dateRevised
2010-9-15
pubmed:year
1982
pubmed:articleTitle
Water Stress Effects on Nitrogen Assimilation and Growth of Trifolium subterraneum L. Using Dinitrogen or Ammonium Nitrate.
pubmed:affiliation
Department of Agronomy and Range Science, University of California, Davis, California 95616.
pubmed:publicationType
Journal Article