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פותח על ידי קלירמאש פתרונות בע"מ -
Development and function of Azospirillum-inoculated roots
Year:
1986
Source of publication :
Plant and Soil
Authors :
קפולניק, יורם
;
.
Volume :
90
Co-Authors:
Okon, Y., Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot, 76100, Israel
Kapulnik, Y., Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot, 76100, Israel
Facilitators :
From page:
3
To page:
16
(
Total pages:
14
)
Abstract:
The surface distribution of Azospirillum on inoculated roots of maize and wheat is generally similar to that of other members of the rhizoplane microflora. During the first three days, colonization takes place mainly on the root elongation zone, on the base of root hairs and, to a lesser extent, on the surface of young root hairs. Azospirillum has been found in cortical tissues, in regions of lateral root emergence, along the inner cortex, inside xylem vessels and between pith cells. Inoculation of several cultivars of wheat, corn, sorghum and setaria with several strains of Azospirillum caused morphological changes in root starting immediately after germination. Root length and surface area were differentially affected according to bacterial age and inoculum level. During the first three weeks after germination, the number of root hairs, root hair branches and lateral roots was increased by inoculation, but there was no change in root weight. Root biomass increased at later stages. Cross-sections of inoculated corn and wheat root showed an irregular arrangement of cells in the outer layers of the cortex. These effects on plant morphology may be due to the production of plant growth-promoting substances by the colonizing bacteria or by the plant as a reaction to colonization. Pectic enzymes may also be involved. Morphological changes had a physiological effect on inoculated roots. Specific activities of oxidative enzymes, and lipid and suberin content, were lower in extracts of inoculated roots than in uninoculated controls. This suggests that inoculated roots have a larger proportion of younger roots. The rate of NO- 3, K+ and H2PO- 4 uptake was greater in inoculated seedlinds. In the field, dry matter, N, P and K accumulated at faster rates, and water content was higher in Azospirillum-inoculated corn, sorghum, wheat and setaria. The above improvements in root development and function lead in many cases to higher crop yield. © 1986 Martinus Nijhoff Publishers.
Note:
Related Files :
Azospirillum brasilense
Inoculation
Mineral uptake
Monocots
Root morphology
עוד תגיות
תוכן קשור
More details
DOI :
10.1007/BF02277383
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23373
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:58
You may also be interested in
Scientific Publication
Development and function of Azospirillum-inoculated roots
90
Okon, Y., Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot, 76100, Israel
Kapulnik, Y., Department of Plant Pathology and Microbiology, Faculty of Agriculture, The Hebrew University of Jerusalem, PO Box 12, Rehovot, 76100, Israel
Development and function of Azospirillum-inoculated roots
The surface distribution of Azospirillum on inoculated roots of maize and wheat is generally similar to that of other members of the rhizoplane microflora. During the first three days, colonization takes place mainly on the root elongation zone, on the base of root hairs and, to a lesser extent, on the surface of young root hairs. Azospirillum has been found in cortical tissues, in regions of lateral root emergence, along the inner cortex, inside xylem vessels and between pith cells. Inoculation of several cultivars of wheat, corn, sorghum and setaria with several strains of Azospirillum caused morphological changes in root starting immediately after germination. Root length and surface area were differentially affected according to bacterial age and inoculum level. During the first three weeks after germination, the number of root hairs, root hair branches and lateral roots was increased by inoculation, but there was no change in root weight. Root biomass increased at later stages. Cross-sections of inoculated corn and wheat root showed an irregular arrangement of cells in the outer layers of the cortex. These effects on plant morphology may be due to the production of plant growth-promoting substances by the colonizing bacteria or by the plant as a reaction to colonization. Pectic enzymes may also be involved. Morphological changes had a physiological effect on inoculated roots. Specific activities of oxidative enzymes, and lipid and suberin content, were lower in extracts of inoculated roots than in uninoculated controls. This suggests that inoculated roots have a larger proportion of younger roots. The rate of NO- 3, K+ and H2PO- 4 uptake was greater in inoculated seedlinds. In the field, dry matter, N, P and K accumulated at faster rates, and water content was higher in Azospirillum-inoculated corn, sorghum, wheat and setaria. The above improvements in root development and function lead in many cases to higher crop yield. © 1986 Martinus Nijhoff Publishers.
Scientific Publication
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