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פותח על ידי קלירמאש פתרונות בע"מ -
Water relations and hydraulic control of stomatal behaviour in bell pepper plant in partial soil drying
Year:
2001
Source of publication :
Plant, Cell and Environment
Authors :
אלוני, בנימין
;
.
מורשת, שמואל
;
.
Volume :
24
Co-Authors:
Yao, C., Department of Agricultural Botany, Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel, Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Volcani Center, Bet Dagan, Israel
Moreshet, S., Department of Agricultural Botany, Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel, Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Volcani Center, Bet Dagan, Israel, Department of Vegetable Crops, Institute of Field and Garden Crops, Volcani Center, Bet Dagan, Israel
Aloni, B., Department of Agricultural Botany, Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel, Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Volcani Center, Bet Dagan, Israel
Facilitators :
From page:
227
To page:
235
(
Total pages:
9
)
Abstract:
Two experiments, a split-root experiment and a root pressurizing experiment, were performed to test whether hydraulic signalling of soil drying plays a dominant role in controlling stomatal closure in herbaceous bell pepper plants. In the split-root experiment, when both root parts were dried, synchronous decreases in stomatal conductance (gS), leaf water potential (LWP) and stem sap flow (SFstem) were observed. The value of gS was found to be closely related to soil water potential (SWP) in both compartments. Tight relationships were observed between gS and stem sap flow under all conditions of water stress, indicating a complete stomatal adjustment of transpiration. When the half-root system has been dried to the extent that its water uptake dropped to almost zero, declines in gS of less than 20% were observed without obvious changes in LWP. The reduced plant hydraulic conductance resulting from decreased sap flow and unchanged LWP may be a hydraulic signal controlling stomatal closure; the results of root pressurizing supported this hypothesis. Both LWP and gS in water-stressed plants recovered completely within 25 min of the application of root pressurizing, and decreased significantly within 40 rain after pressure release, indicating the hydraulic control of stomatal closure. Our results are in contrast to those of other studies on other herbaceous species, which suggested that chemical messengers from the roots bring about stomatal closure when plants are in water stress.
Note:
Related Files :
botany
HYDRAULICS
Root pressurizing
soil moisture
Split-root
Stomatal conductance
water
water stress
עוד תגיות
תוכן קשור
More details
DOI :
10.1046/j.1365-3040.2001.00667.x
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
25333
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:14
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Scientific Publication
Water relations and hydraulic control of stomatal behaviour in bell pepper plant in partial soil drying
24
Yao, C., Department of Agricultural Botany, Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel, Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Volcani Center, Bet Dagan, Israel
Moreshet, S., Department of Agricultural Botany, Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel, Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Volcani Center, Bet Dagan, Israel, Department of Vegetable Crops, Institute of Field and Garden Crops, Volcani Center, Bet Dagan, Israel
Aloni, B., Department of Agricultural Botany, Faculty of Agriculture, Hebrew University of Jerusalem, Rehovot 76100, Israel, Department of Environmental Physics and Irrigation, Institute of Soil, Water and Environmental Sciences, Volcani Center, Bet Dagan, Israel
Water relations and hydraulic control of stomatal behaviour in bell pepper plant in partial soil drying
Two experiments, a split-root experiment and a root pressurizing experiment, were performed to test whether hydraulic signalling of soil drying plays a dominant role in controlling stomatal closure in herbaceous bell pepper plants. In the split-root experiment, when both root parts were dried, synchronous decreases in stomatal conductance (gS), leaf water potential (LWP) and stem sap flow (SFstem) were observed. The value of gS was found to be closely related to soil water potential (SWP) in both compartments. Tight relationships were observed between gS and stem sap flow under all conditions of water stress, indicating a complete stomatal adjustment of transpiration. When the half-root system has been dried to the extent that its water uptake dropped to almost zero, declines in gS of less than 20% were observed without obvious changes in LWP. The reduced plant hydraulic conductance resulting from decreased sap flow and unchanged LWP may be a hydraulic signal controlling stomatal closure; the results of root pressurizing supported this hypothesis. Both LWP and gS in water-stressed plants recovered completely within 25 min of the application of root pressurizing, and decreased significantly within 40 rain after pressure release, indicating the hydraulic control of stomatal closure. Our results are in contrast to those of other studies on other herbaceous species, which suggested that chemical messengers from the roots bring about stomatal closure when plants are in water stress.
Scientific Publication
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