1996
DOI: 10.1093/jxb/47.9.1405
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Stomatal response to abscisic acid fed into the xylem of intactHelianthus annuus(L.) plants

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Cited by 20 publications
(6 citation statements)
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“…1). It has been suggested that such stomatal response could be controlled hormonally, e.g., a negatively linear correlation was found between abscisic acid concentration in the xylem sap and leaf conductance (Heckenberger et al, 1996). Differences in stomatal behavior may also be explained by differences in leaf assimilate concentration, in particular starch (Table 5).…”
Section: Discussionmentioning
confidence: 99%
“…1). It has been suggested that such stomatal response could be controlled hormonally, e.g., a negatively linear correlation was found between abscisic acid concentration in the xylem sap and leaf conductance (Heckenberger et al, 1996). Differences in stomatal behavior may also be explained by differences in leaf assimilate concentration, in particular starch (Table 5).…”
Section: Discussionmentioning
confidence: 99%
“…(compare Figs 5a and 6). It is unlikely that this difference can be explained by turgor gradients because (i) transpiration rate does not change in response to pressure application ( Heckenberger et al . 1996 ); (ii) it is very unlikely that parts of the leaf can fully and immediately compensate for changes in water potential while others cannot; and (iii) an almost 1:1 response of leaf‐cell turgor to the increase in pneumatic pressure at the root system has been observed ( Schurr 1992).…”
Section: Discussionmentioning
confidence: 99%
“…Thus, even the low well-watered concentrations of ABA carried by the xylem may be capable of maintaining stomata in the closed state until normal rates of symplastic sequestration are restored. In related work, Heckenberger, Schurr & Schulze (1996) found that when ABA influx to sunflower leaves was large, either due to long-term feeding of low concentrations or short-term feeding of high concentrations via the xylem, stomatal opening after the cessation of feeding took longer to occur. ABA flux into the leaf may therefore be an important determinant of stomatal aperture under severe but not incipient drought stress, when the capacity of the symplastic reservoir to remove ABA from the apoplast is minimized by a reduction of the inwardly-directed pm concentration gradient for ABA.…”
Section: The Leafmentioning
confidence: 98%