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How do salinity and water stress affect transport of water, assimilates and ions to tomato fruits?
Year:
2004
Source of publication :
Physiologia Plantarum
Authors :
Grava, Avraham
;
.
Plaut, Zvi
;
.
Volume :
122
Co-Authors:
Plaut, Z., Inst. Soils, Water and Environ. Sci., Agricultural Research Organization, Volcani Center, Bet-Dagan 50250, Israel, Besor Experimental Station, R and D Network, M.P.4, Negev 85400, Israel
Grava, A., Inst. Soils, Water and Environ. Sci., Agricultural Research Organization, Volcani Center, Bet-Dagan 50250, Israel
Yehezkel, C., Besor Experimental Station, R and D Network, M.P.4, Negev 85400, Israel
Matan, E., Besor Experimental Station, R and D Network, M.P.4, Negev 85400, Israel
Facilitators :
From page:
429
To page:
442
(
Total pages:
14
)
Abstract:
The study was conducted in order to determine whether water stress affects the accumulation of dry matter in tomato fruits similarly to salinity, and whether the increase in fruit dry matter content is solely a result of the decrease in water content. Although the rate of water transport to tomato fruits decreased throughout the entire season in saline water irrigated plants, accumulation rates of dry matter increased significantly. Phloem water transport contributed 80-85% of the total water transport in the control and water-stressed plants, and over 90% under salinity. The concentration of organic compounds in the phloem sap was increased by 40% by salinity. The rate of ions transported via the xylem was also significantly increased by salinity, but their contribution to fruit osmotic adjustment was less. The rate of fruit transpiration was also markedly reduced by salinity. Water stress also decreased the rate of water transport to the tomato fruit and increased the rate of dry matter accumulation, but much less than salinity. The similar changes, 10-15%, indicate that the rise in dry matter accumulation was a result of the decrease in water transport. Other parameters such as fruit transpiration rates, phloem and xylem sap concentration, relative transport via phloem and xylem, solutes contributing to osmotic adjustment of fruits and leaves, were only slightly affected by water stress. The smaller response of these parameters to water stress as compared to salinity could not be attributed to milder stress intensity, as leaf water potential was found to be more negative. Measuring fruit growth of girdled trusses, in which phloem flow was inactive, and comparing it with ungirdled trusses validated the mechanistic model. The relative transport of girdled as compared to ungirdled fruits resembled the calculated values of xylem transport.
Note:
Related Files :
Fruits
Organic compounds
Stress intensity
transpiration
water stress
Xylen
Show More
Related Content
More details
DOI :
10.1111/j.1399-3054.2004.00416.x
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
28658
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:40
Scientific Publication
How do salinity and water stress affect transport of water, assimilates and ions to tomato fruits?
122
Plaut, Z., Inst. Soils, Water and Environ. Sci., Agricultural Research Organization, Volcani Center, Bet-Dagan 50250, Israel, Besor Experimental Station, R and D Network, M.P.4, Negev 85400, Israel
Grava, A., Inst. Soils, Water and Environ. Sci., Agricultural Research Organization, Volcani Center, Bet-Dagan 50250, Israel
Yehezkel, C., Besor Experimental Station, R and D Network, M.P.4, Negev 85400, Israel
Matan, E., Besor Experimental Station, R and D Network, M.P.4, Negev 85400, Israel
How do salinity and water stress affect transport of water, assimilates and ions to tomato fruits?
The study was conducted in order to determine whether water stress affects the accumulation of dry matter in tomato fruits similarly to salinity, and whether the increase in fruit dry matter content is solely a result of the decrease in water content. Although the rate of water transport to tomato fruits decreased throughout the entire season in saline water irrigated plants, accumulation rates of dry matter increased significantly. Phloem water transport contributed 80-85% of the total water transport in the control and water-stressed plants, and over 90% under salinity. The concentration of organic compounds in the phloem sap was increased by 40% by salinity. The rate of ions transported via the xylem was also significantly increased by salinity, but their contribution to fruit osmotic adjustment was less. The rate of fruit transpiration was also markedly reduced by salinity. Water stress also decreased the rate of water transport to the tomato fruit and increased the rate of dry matter accumulation, but much less than salinity. The similar changes, 10-15%, indicate that the rise in dry matter accumulation was a result of the decrease in water transport. Other parameters such as fruit transpiration rates, phloem and xylem sap concentration, relative transport via phloem and xylem, solutes contributing to osmotic adjustment of fruits and leaves, were only slightly affected by water stress. The smaller response of these parameters to water stress as compared to salinity could not be attributed to milder stress intensity, as leaf water potential was found to be more negative. Measuring fruit growth of girdled trusses, in which phloem flow was inactive, and comparing it with ungirdled trusses validated the mechanistic model. The relative transport of girdled as compared to ungirdled fruits resembled the calculated values of xylem transport.
Scientific Publication
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