Abstract
Because of their sessile nature, plants evolved several mechanisms to tolerate or avoid conditions where water is scarce. The molecular mechanisms contributing to drought tolerance have been studied extensively, whereas the molecular mechanism underlying drought avoidance is less understood despite its importance. Several lines of evidence showed that the roots sense the moisture gradient and grow toward the wet area: so-called hydrotropism. We previously identified MIZU-KUSSEI (MIZ) 1 and MIZ2/GNOM as genes responsible for this process. To gain new insight into the molecular mechanism of root hydrotropism, we generated overexpressors of MIZ1 (MIZ1OEs) and analyzed their hydrotropic response. MIZ1OEs had a remarkable enhancement of root hydrotropism. Furthermore, a greater number of MIZ1OE root cells remained viable under hydrostimulated conditions than those of the wild type, which might contribute to retaining root growth under hydrostimulated conditions. Although overexpression of MIZ1 also caused a slight decrease in the root gravitropic response, it was not attributable to the enhanced hydrotropic response. In addition, miz2 mutation or the auxin response inhibitor nullified the enhanced hydrotropic response in MIZ1OEs. Furthermore, the expression of MIZ1 did not alter the expression of typical genes involved in drought tolerance. These results suggest that MIZ1 positively regulates hydrotropism at an early stage and its overexpression results in an enhancement of signal transduction unique to root hydrotropism to increase the degree of hydrotropic root bending.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
MIZ1 overexpressors had a remarkably enhanced root hydrotropic response.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianat0 - Treatment
- MIZ1OEse1
- Gene
- MIZ1e1
- Outcome
- root hydrotropisme1
- Direction
- enhancemente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e1“MIZ1OEs had a remarkable enhancement of root hydrotropism”
Claim · model-written summary
A greater number of MIZ1OE root cells remained viable under hydrostimulated conditions than in the wild type.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- root cellse1
- Treatment
- MIZ1OEe1
- Outcome
- root cells remained viablee1
- Direction
- greater numbere1
- Comparator
- wild typee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e1“a greater number of MIZ1OE root cells remained viable under hydrostimulated conditions than those of the wild type”
Claim · model-written summary
Overexpression of MIZ1 caused a slight decrease in the root gravitropic response.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- overexpression of MIZ1e1
- Outcome
- root gravitropic responsee1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e1“overexpression of MIZ1 also caused a slight decrease in the root gravitropic response”
Claim · model-written summary
The decrease in gravitropic response was not attributable to the enhanced hydrotropic response.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Gene
- MIZ1e1
- Outcome
- root gravitropic responsee1
- Qualifier
- not attributable to the enhanced hydrotropic responsee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e1“Although overexpression of MIZ1 also caused a slight decrease in the root gravitropic response, it was not attributable to the enhanced hydrotropic response”
Claim · model-written summary
The miz2 mutation nullified the enhanced hydrotropic response in MIZ1OEs.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- miz2 mutatione1
- Outcome
- enhanced hydrotropic responsee1
- Direction
- nullifiede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e1“miz2 mutation or the auxin response inhibitor nullified the enhanced hydrotropic response in MIZ1OEs”
Claim · model-written summary
The auxin response inhibitor nullified the enhanced hydrotropic response in MIZ1OEs.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- the auxin response inhibitore1
- Outcome
- enhanced hydrotropic responsee1
- Direction
- nullifiede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e1“miz2 mutation or the auxin response inhibitor nullified the enhanced hydrotropic response in MIZ1OEs”
Claim · model-written summary
Expression of MIZ1 did not alter the expression of typical genes involved in drought tolerance.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- expression of MIZ1e1
- Outcome
- expression of typical genes involved in drought tolerancee1
- Direction
- did not altere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e1“the expression of MIZ1 did not alter the expression of typical genes involved in drought tolerance”
Claim · model-written summary
The authors suggest MIZ1 positively regulates hydrotropism at an early stage.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Gene
- MIZ1e1
- Outcome
- hydrotropisme1
- Qualifier
- at an early stagee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e1“MIZ1 positively regulates hydrotropism at an early stage”
The same questions in other papers
transgenic · molecular: expression · Arabidopsis thaliana (thale cress)Positive and negative results
7 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
13 papers more in this group
See all 17 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.