Abstract
Plant responses to water deficit are dynamic and varied, requiring co-ordination between the shoot and root. Among these responses are alterations in gene expression. The expression of four genes, le4, le16, le20, and le25, which require increased ABA content for expression, was studied in tomato plants in which the root systems were divided between two large pots to impose water deficit gradually and to control signals from the root in response to soil drying without inducing a signal from the shoot. One group of plants had one-half of the roots watered, another group had both halves watered, and another group had neither halves watered. In unwatered plants, the expression of le4 and le25 correlated with ABA content, and that of le16 and le20 occurred before a detectable increase in leaf ABA content. The contrasting patterns of expression indicate a difference in sensitivity of these genes to ABA or an additional signalling mechanism. Ample evidence indicates that shoot processes such as stomatal closure are controlled by signals from the root. This study demonstrates that genes may also be induced in the shoot by signals from the root. Shoots of plants in which only half of the roots were watered showed no decrease in relative water content and no increase in ABA content; however, three of the four genes, le4, le16, and le20, were induced. Root-to-shoot communication plays a role in changes in gene expression and in alterations in physiological processes.
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Claims 6
Claim · model-written summary
In unwatered tomato plants, le4 and le25 expression correlated with ABA content.
- Taxon
- tomato
Solanum lycopersicume1 - Treatment
- unwaterede2
- Gene
- le4 and le25e2
- Compound
- ABAe2
- Outcome
- expressione2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The expression of four genes, le4, le16, le20, and le25, which require increased ABA content for expression, was studied in tomato plants”
e2“In unwatered plants, the expression of le4 and le25 correlated with ABA content, and that of le16 and le20 occurred before a detectable increase in leaf ABA content”
Claim · model-written summary
In unwatered tomato plants, le16 and le20 expression occurred before a detectable increase in leaf ABA content.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- unwaterede2
- Gene
- le16 and le20e2
- Compound
- ABAe2
- Outcome
- expressione2
- Qualifier
- before a detectable increase in leaf ABA contente2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The expression of four genes, le4, le16, le20, and le25, which require increased ABA content for expression, was studied in tomato plants”
e2“In unwatered plants, the expression of le4 and le25 correlated with ABA content, and that of le16 and le20 occurred before a detectable increase in leaf ABA content”
Claim · model-written summary
Shoots of tomato plants with only half of the roots watered showed no decrease in relative water content.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- only half of the roots were waterede4
- Outcome
- relative water contente4
- Direction
- no decreasee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The expression of four genes, le4, le16, le20, and le25, which require increased ABA content for expression, was studied in tomato plants”
e4“Shoots of plants in which only half of the roots were watered showed no decrease in relative water content and no increase in ABA content; however, three of the four genes, le4, le16, and le20, were induced”
Claim · model-written summary
Shoots of tomato plants with only half of the roots watered showed no increase in ABA content.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- only half of the roots were waterede4
- Compound
- ABAe4
- Outcome
- ABA contente4
- Direction
- no increasee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The expression of four genes, le4, le16, le20, and le25, which require increased ABA content for expression, was studied in tomato plants”
e4“Shoots of plants in which only half of the roots were watered showed no decrease in relative water content and no increase in ABA content; however, three of the four genes, le4, le16, and le20, were induced”
Claim · model-written summary
In shoots of tomato plants with only half of the roots watered, three of the four genes le4, le16 and le20 were induced.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- only half of the roots were waterede4
- Gene
- le4, le16, and le20e4
- Outcome
- three of the four genese4
- Direction
- inducede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The expression of four genes, le4, le16, le20, and le25, which require increased ABA content for expression, was studied in tomato plants”
e4“Shoots of plants in which only half of the roots were watered showed no decrease in relative water content and no increase in ABA content; however, three of the four genes, le4, le16, and le20, were induced”
Claim · model-written summary
Genes may also be induced in the tomato shoot by signals from the root.
- Taxon
- tomatoSolanum lycopersicume1
- Outcome
- genes may also be induced in the shoote5
- Qualifier
- signals from the roote5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The expression of four genes, le4, le16, le20, and le25, which require increased ABA content for expression, was studied in tomato plants”
e5“This study demonstrates that genes may also be induced in the shoot by signals from the root”