Role of the Apoplast in the Control of Assimilate Transport, Photosynthesis, and Plant Productivity

Chikov, V. I.; Bakirova, G. G.

doi:10.1023/b:rupp.0000028691.49600.c2

Cited by 21 publications

(12 citation statements)

References 36 publications

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“…1997), the data are consistent, with the hexoses in the bulk‐leaf apoplast, particularly fructose, having a different origin (cf. Figs 3 & 4) such as the transpiration stream (Minchin & McNaughton 1987; Chikov & Bakirova 2004; Chikov et al. 2005), perhaps as a result of phloem leakage (e.g.…”

Section: Discussionmentioning

confidence: 99%

Guard‐cell apoplastic sucrose concentration – a link between leaf photosynthesis and stomatal aperture size in the apoplastic phloem loader Vicia faba L.

Kang

Outlaw

Andersen

et al. 2007

Plant Cell & Environment

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In broad bean (Vicia faba L.), an apoplastic phloem loader, the sucrose concentration increases up to~2 mM in the leaf apoplast and up to~150 mM in the guard-cell apoplast during the photoperiod. This high concentration in the guard-cell apoplast results from transpiration and is sufficient osmotically to reduce stomatal aperture size by up to 3 mm or~25% of the maximum aperture size. In this paper, we investigated a parallel and required role for high bulkleaf apoplastic sucrose concentration, which correlates with high photosynthesis rate. An empirically determined combination of lowered light intensity and lowered CO2 concentration reduced the photosynthesis rate to nominally one-fifth of the control value without a significant change in transpiration. This reduction in photosynthesis caused the sucrose concentration in the leaf apoplast -the immediate source pool for guard cells -to decrease by 70% (to 0.4 mM). In turn, sucrose concentration in the guard-cell apoplast decreased by~80% (to~40 mM). These results complete the required evidence for a non-exclusive, transpiration-linked, photosynthesis-dependent passive mechanism for the modulation of stomatal aperture size. In an ancillary investigation, hexoses in the bulk-leaf apoplast decreased when photosynthesis was lowered, but their concentrations in the guard-cell apoplast of control plants indicated that their osmotic contribution was negligible.

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Section: Discussionmentioning

confidence: 99%

Guard‐cell apoplastic sucrose concentration – a link between leaf photosynthesis and stomatal aperture size in the apoplastic phloem loader Vicia faba L.

Kang

Outlaw

Andersen

et al. 2007

Plant Cell & Environment

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“…Changes in the sucroseto-hexose ratio in the leaves exporting 14 C-assimilates (Table 2), the index usually directly depending on the export function of the leaf [8], also agree with oppositely directed assimilate efflux from the leaves of plants of these types of treatment.…”

Section: Discussionmentioning

confidence: 75%

Effect of Defoliation or Excision of Growing Axillary Shoots on the Composition of Labeled Products of Photosynthesis in the Leaves and Xylem Sap of Kidney Bean

Chikov

Bakirova

Batasheva

et al. 2005

Russ J Plant Physiol

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The content of 14 C in the products of photosynthesis of the source leaf and xylem sap was investigated in kidney bean ( Phaseolus vulgaris L.) plants during the stage of mass tillering. 14 C partition was measured a day after two-minute photoassimilation of 14 ëé 2 by an individual mature leaf located in the middle part of the shoot. The source-sink relations were disturbed by the excision of all mature leaves (except the source leaf) or all growing axillary shoots. The leaves or growing axillary shoots were excised 15 min after leaf feeding with 14 ëé 2 . A day later, in plants with excised growing axillary shoots, the content of 14 C in the source leaf was by 18% higher and in those with removed leaves by 15% lower than in control plants. The next day after the excision of growing axillary shoots, radioactivity of the xylem sap increased; after defoliation, both the volume of the xylem sap and its specific radioactivity decreased. In the xylem sap of defoliated plants, the proportion of 14 C in malate decreased more than six times, whereas the proportion of 14 C in amino acids somewhat increased (1.5 times). In two days, the volume of the xylem sap exuded by treated plants became the same as in control plants and its radioactivity decreased almost by an order of magnitude but essentially did not differ in the both types of treatment. It is concluded that the processes occurring in the roots are governed by photosynthesis but its regulatory effect is limited by a photoperiod and largely depends on changes in the ratio between biosynthesis of amino acids in the roots and leaves.

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“…NH 4 NO 3 solution feeding led to lesser inhibition of assimilate export and slightly changed the pattern of 14 C partitioning along the shoot compared to those under KNO 3 solution feeding (Batasheva et al, 2007). In flax, most 14 C-sucrose after being loaded into the phloem terminals in source leaves moves downwards within stem phloem vessels, and 14 C content in the plant lower parts gradually raises (Chikov & Bakirova, 2004). During their movement along the stem assimilates can partly escape into the stem apoplast, and long distant transport is controlled by retention and retrieval mechanisms in the phloem (Ayre et al, 2003).…”

Section: Compoundsmentioning

confidence: 99%

The Role of C to N Balance in the Regulation of Photosynthetic Function

Chikov¹,

Batasheva²

2012

Advances in Photosynthesis - Fundamental Aspects

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Role of the Apoplast in the Control of Assimilate Transport, Photosynthesis, and Plant Productivity

Cited by 21 publications

References 36 publications

Guard‐cell apoplastic sucrose concentration – a link between leaf photosynthesis and stomatal aperture size in the apoplastic phloem loader Vicia faba L.

Guard‐cell apoplastic sucrose concentration – a link between leaf photosynthesis and stomatal aperture size in the apoplastic phloem loader Vicia faba L.

Effect of Defoliation or Excision of Growing Axillary Shoots on the Composition of Labeled Products of Photosynthesis in the Leaves and Xylem Sap of Kidney Bean

The Role of C to N Balance in the Regulation of Photosynthetic Function

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