Abstract
Low-cost technology is needed to alleviate high-temperature injury for high-yield greenhouse tomato production. To acquire information about the physiological and morphological effects of root-zone cooling, we grew young tomato plants for 2 weeks in nutrient solution held at about 25°C, considered to be the optimum temperature for tomato plants. We investigated plant growth, nutrient uptake, root activity (xylem exudation and root respiration rate), root indole-3-acetic acid (IAA) concentration, and internal root structure. The root-zone temperature was maintained at 24.7°C by cooling, while the air temperature and control temperatures were higher than optimum (30.8 and 33.7°C, respectively). Root-zone cooling increased the relative growth rate (RGR) of roots compared with the control, followed by shoot RGR. Root IAA was positively correlated with root RGR. Root-zone cooling increased Ca and Mg uptake as well as root xylem exudation and respiration. It also advanced the development of the internal structure of the xylem near the root tip. Thus, possibly by increasing root activity and root IAA, root-zone cooling promoted root growth and nutrient uptake mediated by the development of the root xylem, and thus shoot growth. These results suggest a physiological and morphological mechanism of growth enhancement by root-zone cooling under high air temperature conditions.
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Claims 7
Claim · model-written summary
Root-zone cooling increased the relative growth rate of roots compared with the control in young tomato plants.
- Taxon
- tomato
Solanum lycopersicumt0 - Organ / stage
- rootse1
- Treatment
- Root-zone coolinge1
- Outcome
- relative growth rate (RGR) of rootse1
- Direction
- increasede1
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Root-zone cooling increased the relative growth rate (RGR) of roots compared with the control”
t0“Tomato Plants”
Claim · model-written summary
Root-zone cooling increased shoot relative growth rate compared with the control, less than root growth.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Root-zone coolinge1
- Outcome
- shoot RGRe1
- Direction
- increasee1
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Root-zone cooling increased the relative growth rate (RGR) of roots compared with the control, followed by shoot RGR”
t0“Tomato Plants”
Claim · model-written summary
Root IAA concentration was positively correlated with root relative growth rate in tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Compound
- IAAe2
- Outcome
- root RGRe2
- Direction
- positively correlatede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Root IAA was positively correlated with root RGR”
t0“Tomato Plants”
Claim · model-written summary
Root-zone cooling increased Ca and Mg uptake in tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Root-zone coolinge3
- Outcome
- Ca and Mg uptakee3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Root-zone cooling increased Ca and Mg uptake”
t0“Tomato Plants”
Claim · model-written summary
Root-zone cooling increased root xylem exudation and root respiration in tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Root-zone coolinge4
- Outcome
- root xylem exudation and respiratione4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Root-zone cooling increased Ca and Mg uptake as well as root xylem exudation and respiration”
t0“Tomato Plants”
Claim · model-written summary
Root-zone cooling advanced the development of the internal structure of the xylem near the root tip compared with the control in tomato.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- xyleme1
- Treatment
- Root-zone coolinge2
- Outcome
- development of the internal structure of the xylem near the root tipe1
- Direction
- advancede1
- Comparator
- controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“It also advanced the development of the internal structure of the xylem near the root tip”
e2“Root-zone cooling increased the relative growth rate (RGR) of roots compared with the control”
t0“Tomato Plants”
Claim · model-written summary
Root-zone cooling possibly promoted root growth and nutrient uptake through increased root activity and root IAA, mediated by root xylem development.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- root-zone coolinge4
- Outcome
- root growth and nutrient uptakee4
- Qualifier
- possibly by increasing root activity and root IAAe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Thus, possibly by increasing root activity and root IAA, root-zone cooling promoted root growth and nutrient uptake mediated by the development of the root xylem”
t0“Tomato Plants”
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See all 66 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.