Publication
The role of abscisic acid and water relations in drought responses of subterranean clover
| dc.contributor.author | Socias, X | |
| dc.contributor.author | Correia, MJ | |
| dc.contributor.author | Chaves, M | |
| dc.contributor.author | Medrano, H | |
| dc.date.accessioned | 2018-12-07T14:53:36Z | |
| dc.date.available | 2018-12-07T14:53:36Z | |
| dc.date.issued | 1997-06 | |
| dc.description.abstract | The role of water relations and abscisic acid (ABA) in the responses to drought were studied in a mediterranean forage crop, Trifolium subterraneum L. under field conditions. soil and plant water status, leaf gas exchange parameters, and xylem sap ABA content were determined at different times during a long-term soil drying episode in irrigated and droughted plants. The diurnal time-courses of these parameters were also measured at the end of a drought period. In response to soil drying stomatal conductance (g) was reduced early to 50% that of irrigated plants before any substantial change in water potential was detected. A close logarithmic regression between photosynthesis rate (A) and g was present. For the first weeks of drought the decline in A was less pronounced than in g, thus increasing water use efficiency. Stomatal conductance during diurnal time-courses showed no consistent relationships with respect to either ABA or leaf water potential. throughout the experimental period dependence of g on leaf water status was evident from the tight correlation (r(2) = 0.88, P < 0.01) achieved between stomatal conductance and midday water potential, but the correlation was also high when comparing g with respect to ABA content in xylem sap (r(2) = 0.83, P < 0.001). However, the stomata from drought acclimated plants were apparently more sensitive to xylem ABA content. For similar xylem ABA concentrations stomatal conductance was significantly higher in irrigated than in water-stressed plants. | |
| dc.description.version | info:eu-repo/semantics/publishedVersion | |
| dc.identifier.doi | 10.1093/jxb/48.6.1281 | |
| dc.identifier.issn | 0022-0957 | |
| dc.identifier.uri | http://hdl.handle.net/10400.1/11594 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | |
| dc.publisher | Oxford University Press | |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
| dc.subject | Leaf gas-exchange | |
| dc.subject | Stomatal response | |
| dc.subject | Drying soil | |
| dc.subject | Xylem sap | |
| dc.subject | Conductance | |
| dc.subject | Stress | |
| dc.subject | Photosynthesis | |
| dc.subject | Sensitivity | |
| dc.subject | Cultivars | |
| dc.subject | Deficits | |
| dc.title | The role of abscisic acid and water relations in drought responses of subterranean clover | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 1288 | |
| oaire.citation.issue | 311 | |
| oaire.citation.startPage | 1281 | |
| oaire.citation.title | Journal of Experimental Botany | |
| oaire.citation.volume | 48 | |
| person.familyName | Chaves | |
| person.givenName | Maria Manuela | |
| person.identifier.orcid | 0000-0002-1664-3188 | |
| person.identifier.scopus-author-id | 35565567000 | |
| rcaap.rights | openAccess | |
| rcaap.type | article | |
| relation.isAuthorOfPublication | c35298f1-6ab3-4e0d-86f8-d17de944d4ae | |
| relation.isAuthorOfPublication.latestForDiscovery | c35298f1-6ab3-4e0d-86f8-d17de944d4ae |
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