נגישות
menu      
חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Long-term hydraulic acclimation to soil texture and radiation load in cotton
Year:
2005
Source of publication :
Plant, Cell and Environment
Authors :
כהן, שבתאי
;
.
Volume :
28
Co-Authors:
Li, Y., Fukang Station of Desert Ecology, Xinjiang Inst. of Ecol. and Geogr., Chinese Academy of Sciences, 40-3 South Beijing Road, Xinjiang 830011, China
Xu, H., Fukang Station of Desert Ecology, Xinjiang Inst. of Ecol. and Geogr., Chinese Academy of Sciences, 40-3 South Beijing Road, Xinjiang 830011, China, Graduate School, Chinese Academy of Sciences, 19A, Yu-Quan Road, Beijing 100039, China
Cohen, S., Inst. Soil, Water and Environ. Sci., ARO Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
492
To page:
499
(
Total pages:
8
)
Abstract:
The concept of root contact hypothesizes that the absorbing roots grown in sandy soil are only partially effective in water uptake. Co-ordination of water supply and demand in the plant requires that the capacity for water uptake from the soil should correspond to an operational rate of water loss from the leaves. To examine how the plant hydraulic system responds to variations in soil texture or evaporative demand through long-term acclimation, an experiment was carried on cotton plants (Gossypium herbaceum L.), where three grades of soil texture and three grades of evaporative demand were applied for the whole life cycle of the plants. Plants were harvested 50 and 90 d (fully grown) after sowing and root length and leaf area measured. At 90 d hydraulic conductance was measured as the ratio of sap flow (measured with sap flow sensors or gravimetrically) and water potential. Results showed that for plants grown at the same evaporative demand, those in sandy soil, where root-specific hydraulic conductance was low, developed more absorbing roots than those grown in heavy-textured soil, where root specific conductance was high. This resulted in the same leaf specific hydraulic conductance (1.8 x 10 -4 kg s -1 Mpa -1 m -2) for all three soils. For plants grown in the same sandy soil, those subjected to strong evaporative demand developed more absorbing roots and higher leaf-specific hydraulic conductance than those grown under mild evaporative demand. It is concluded that when soil texture or atmospheric evaporative demand varies, plants co-ordinate their capacities for liquid phase and vapour phase water transport through long-term acclimation of the hydraulic system, or plastic morphological adaptation of the root/leaf ratio. © 2005 Blackwell Publishing Ltd.
Note:
Related Files :
Acclimation
Hydraulic conductance
plant water relations
Root-to-shoot ratio
root length
soil texture
עוד תגיות
תוכן קשור
More details
DOI :
10.1111/j.1365-3040.2005.01291.x
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23193
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:57
Scientific Publication
Long-term hydraulic acclimation to soil texture and radiation load in cotton
28
Li, Y., Fukang Station of Desert Ecology, Xinjiang Inst. of Ecol. and Geogr., Chinese Academy of Sciences, 40-3 South Beijing Road, Xinjiang 830011, China
Xu, H., Fukang Station of Desert Ecology, Xinjiang Inst. of Ecol. and Geogr., Chinese Academy of Sciences, 40-3 South Beijing Road, Xinjiang 830011, China, Graduate School, Chinese Academy of Sciences, 19A, Yu-Quan Road, Beijing 100039, China
Cohen, S., Inst. Soil, Water and Environ. Sci., ARO Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Long-term hydraulic acclimation to soil texture and radiation load in cotton
The concept of root contact hypothesizes that the absorbing roots grown in sandy soil are only partially effective in water uptake. Co-ordination of water supply and demand in the plant requires that the capacity for water uptake from the soil should correspond to an operational rate of water loss from the leaves. To examine how the plant hydraulic system responds to variations in soil texture or evaporative demand through long-term acclimation, an experiment was carried on cotton plants (Gossypium herbaceum L.), where three grades of soil texture and three grades of evaporative demand were applied for the whole life cycle of the plants. Plants were harvested 50 and 90 d (fully grown) after sowing and root length and leaf area measured. At 90 d hydraulic conductance was measured as the ratio of sap flow (measured with sap flow sensors or gravimetrically) and water potential. Results showed that for plants grown at the same evaporative demand, those in sandy soil, where root-specific hydraulic conductance was low, developed more absorbing roots than those grown in heavy-textured soil, where root specific conductance was high. This resulted in the same leaf specific hydraulic conductance (1.8 x 10 -4 kg s -1 Mpa -1 m -2) for all three soils. For plants grown in the same sandy soil, those subjected to strong evaporative demand developed more absorbing roots and higher leaf-specific hydraulic conductance than those grown under mild evaporative demand. It is concluded that when soil texture or atmospheric evaporative demand varies, plants co-ordinate their capacities for liquid phase and vapour phase water transport through long-term acclimation of the hydraulic system, or plastic morphological adaptation of the root/leaf ratio. © 2005 Blackwell Publishing Ltd.
Scientific Publication
You may also be interested in