Stomatal response to abscisic acid fed into the xylem of intact<i>Helianthus annuus</i>(L.) plants

Heckenberger, U.; Schurr, Ulrich; Schilze, E-D.

doi:10.1093/jxb/47.9.1405

Cited by 20 publications

(6 citation statements)

References 27 publications

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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%

Effects of Crop Load on Fruiting and Gas-exchange Characteristics of `Braeburn'/M.26 Apple Trees at Full Canopy

Wünsche¹,

Palmer²,

Greer³

2000

jashs

124

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Effect of crop load on tree growth, leaf characteristics, photosynthesis, and fruit quality of 5-year-old `Braeburn' apple [Malus sylvestris (L.) Mill. var. domestica (Borkh.) Mansf.] trees on Malling 26 (M.26) rootstock was examined during the 1994-95 growing season. Crop loads ranged from 0 to 57 kg/tree [0 to 1.6 kg fruit/cm2 trunk cross sectional area (TCA) or 0 to 8.7 fruit/cm2 TCA]. Fruit maturity as indicated by background color, starch/iodine score, and soluble solids was advanced significantly on low-cropping trees compared to high-cropping trees. Whole-canopy leaf area and percentage tree light interception increased linearly with a significant trend as crop load decreased. From midseason until fruit harvest, leaf photosynthesis decreased significantly on lighter cropping trees and similarly, a positive linear trend was found between whole-canopy gas exchange per unit area of leaf and crop load. Leaf starch concentration in midseason increased linearly as crop load decreased, providing some explanation for the increased down-regulation of photosynthesis on trees with lower crop loads. After fruit harvest, the previous crop loads had no effect on leaf photosynthesis and preharvest differences in whole-canopy gas exchange per unit area of leaf were less pronounced. At each measurement date, daily whole-canopy net carbon exchange and transpiration closely followed the diurnal pattern of incident photosynthetic photon flux. The photochemical yield and electron transport capacity depended on crop load. This was due mostly to reaction center closure before harvest and an increased nonphotochemical quenching after harvest.

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Section: Discussionmentioning

confidence: 99%

Effects of Crop Load on Fruiting and Gas-exchange Characteristics of `Braeburn'/M.26 Apple Trees at Full Canopy

Wünsche¹,

Palmer²,

Greer³

2000

jashs

124

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“…(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%

Quantitative analysis of the local rates of growth of dicot leaves at a high temporal and spatial resolution, using image sequence analysis

et al. 1998

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SummaryA new technique is presented for quantitative mapping of dicot leaf growth at high spatial and temporal resolution, at a speed making online-mapping feasible. Time lapse video sequences of growing leaves are captured by a personal computer (PC) with a frame-grabber board and a standard CCD camera, and evaluated using algorithms that have been recently developed to analyse motion in dynamic image sequences. Growth can be detected at under 1% per hour, with a time resolution of minutes and a spatial resolution of a few millimeters. The new technique has been verified by comparing it with classical approaches to map integrated growth. Diurnal courses of leaf growth of Ricinus communis and tobacco are presented to demonstrate the localised character of growth in leaves. Expansion growth is restricted to the base of the leaf and is restricted to a few hours at the end of the night and the start of the day. The high resolution of the method is illustrated by mapping the responses to stepchanges in leaf turgor. A 3 bar turgor jump led to a rapid transient expansion over the entire length of the leaf that was partially reversed when the turgor was relaxed.

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“…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%

ABA‐based chemical signalling: the co‐ordination of responses to stress in plants

Wilkinson

Davies

2002

Plant Cell & Environment

876

552

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Stomatal response to abscisic acid fed into the xylem of intactHelianthus annuus(L.) plants

Cited by 20 publications

References 27 publications

Effects of Crop Load on Fruiting and Gas-exchange Characteristics of `Braeburn'/M.26 Apple Trees at Full Canopy

Effects of Crop Load on Fruiting and Gas-exchange Characteristics of `Braeburn'/M.26 Apple Trees at Full Canopy

Quantitative analysis of the local rates of growth of dicot leaves at a high temporal and spatial resolution, using image sequence analysis

ABA‐based chemical signalling: the co‐ordination of responses to stress in plants

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