Changes in osmotic and turgor pressure in response to sugar accumulation in barley source leaves

被引：0

作者：

Olga A. Koroleva

Deri A. Tomos

John Farrar

Christopher J. Pollock

机构：

[1] School of Biological Sciences,

[2] University of Wales Bangor,undefined

[3] Bangor,undefined

[4] Gwynedd,undefined

[5] Wales,undefined

[6] LL57 2UW,undefined

[7] UK,undefined

[8] IGER,undefined

[9] Plas Gogerddan,undefined

[10] Aberystwyth,undefined

[11] Ceredigion,undefined

[12] SY23 3EB,undefined

[13] Wales,undefined

[14] UK,undefined

[15] Present address: John Innes Centre,undefined

[16] Colney,undefined

[17] Norwich,undefined

[18] NR4 7UH,undefined

[19] UK,undefined

[20] e-mail: olga.koroleva@bbsrc.ac.uk,undefined

来源：

Planta | 2002年 / 215卷

关键词：

Hordeum (water relations) Single-cell monitoring Sugar accumulation Turgor and osmotic pressure Transpiration;

D O I：

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中图分类号：

学科分类号：

摘要：

Pressure-probe measurements and single-cell sampling and analysis techniques were used to determine the effect of photosynthetic production and accumulation of sugars on osmotic and turgor pressures of individual cells of barley (Hordeum vulgare L.) source leaves. In control plants, the changes in osmotic pressure in individual cells during the photoperiod were different for mesophyll (increase of 276 mOsmol/kg), parenchymatous bundle sheath (PBS; increase of 100 mOsmol/kg) and epidermis (remains constant). There was also an increase in osmotic pressure at the tissue level. Cooling of roots and the shoot apical meristem restricted the export of sugars from leaves, and the resulting changes in osmotic and turgor pressure were monitored. In contrast to the control leaves, mesophyll, PBS, and epidermal cells showed a similar increase in osmotic pressure (up to 500 mOsmol/kg). Cooling also increased the turgor pressure in epidermal and (to a greater extent) PBS cells. The difference in turgor pressure between epidermal and PBS cells is consistent with the presence of a water potential gradient within the leaf, from the vascular bundles towards the leaf surface.

引用

页码：210 / 219

页数：9