Abstract
Root hairs absorb water and mineral nutrients while anchoring growing root tips. They must navigate through soils of varying mechanical properties. Mechanical changes in their microenvironment affect root hair shape and growth rate, but what underlies these responses has remained elusive. To uncover these mechanisms, we grew seedlings of Arabidopsis thaliana (Col-0) in media with increasing mechanical stiffness. Col-0 seedlings showed both shorter and fewer root hairs with increasing mechanical resistance. We used incipient plasmolysis to estimate turgor pressure in trichoblasts and found that it also decreased with increasing media stiffness. Because cellulose is the major load-bearing polymer in the cell wall and influences cell expansion, we quantified cellulose orientation in root hairs. We found that cellulose fibrils were oriented at steeper angles relative to the growth axis in root hairs grown in stiffer media, suggesting a response to mechanical stress. Cell wall thickness also increased with increasing media stiffness. Microtubule orientations followed patterns that were similar to those of cellulose fibrils, but at a smaller angle relative to the growth axis, whereas microtubule density decreased with increasing media stiffness. Unexpectedly, we observed that root hairs grew faster in stiffer media, implying that their growth is misregulated, potentially triggering wall integrity signaling that causes early growth arrest. Finite element modeling of root hairs predicted decreased surface stress, explaining these growth phenotypes. These findings help establish mechanistic links among mechanotransduction, cytoskeletal dynamics, and cell wall assembly during root hair growth.
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Claims 8
Claim · model-written summary
Col-0 root hairs were both shorter and fewer with increasing mechanical resistance.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Material
- Col-0e1
- Treatment
- increasing mechanical resistancee1
- Outcome
- root hairse1
- Direction
- shorter and fewere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we grew seedlings of Arabidopsis thaliana (Col-0) in media with increasing mechanical stiffness”
e1“Col-0 seedlings showed both shorter and fewer root hairs with increasing mechanical resistance”
Claim · model-written summary
Root hair turgor pressure decreased with increasing media stiffness.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Treatment
- increasing media stiffnesse2
- Outcome
- turgor pressure in trichoblastse2
- Direction
- decreasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we grew seedlings of Arabidopsis thaliana (Col-0) in media with increasing mechanical stiffness”
e2“We used incipient plasmolysis to estimate turgor pressure in trichoblasts and found that it also decreased with increasing media stiffness”
Claim · model-written summary
Cellulose fibrils in root hairs grown in stiffer media were oriented at steeper angles relative to the growth axis.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Organ / stage
- root hairse3
- Treatment
- stiffer mediae3
- Outcome
- cellulose fibrilse3
- Direction
- oriented at steeper anglese3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we grew seedlings of Arabidopsis thaliana (Col-0) in media with increasing mechanical stiffness”
e3“We found that cellulose fibrils were oriented at steeper angles relative to the growth axis in root hairs grown in stiffer media”
Claim · model-written summary
Cell wall thickness increased with increasing media stiffness.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Treatment
- increasing media stiffnesse4
- Outcome
- Cell wall thicknesse4
- Direction
- increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we grew seedlings of Arabidopsis thaliana (Col-0) in media with increasing mechanical stiffness”
e4“Cell wall thickness also increased with increasing media stiffness”
Claim · model-written summary
Microtubule orientations followed patterns similar to those of cellulose fibrils, at a smaller angle relative to the growth axis.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Outcome
- Microtubule orientationse5
- Qualifier
- similar to those of cellulose fibrils, but at a smaller angle relative to the growth axise5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we grew seedlings of Arabidopsis thaliana (Col-0) in media with increasing mechanical stiffness”
e5“Microtubule orientations followed patterns that were similar to those of cellulose fibrils, but at a smaller angle relative to the growth axis”
Claim · model-written summary
Microtubule density decreased with increasing media stiffness.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Treatment
- increasing media stiffnesse6
- Outcome
- microtubule densitye6
- Direction
- decreasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we grew seedlings of Arabidopsis thaliana (Col-0) in media with increasing mechanical stiffness”
e6“whereas microtubule density decreased with increasing media stiffness”
Claim · model-written summary
Root hairs grew faster in stiffer media, which the authors consider misregulated growth.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Treatment
- stiffer mediae7
- Outcome
- root hairse7
- Direction
- grew fastere7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we grew seedlings of Arabidopsis thaliana (Col-0) in media with increasing mechanical stiffness”
e7“we observed that root hairs grew faster in stiffer media”
Claim · model-written summary
Finite element modeling predicted decreased surface stress in root hairs.
- Taxon
- Arabidopsis thalianaArabidopsis thalianae0
- Outcome
- surface stresse1
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we grew seedlings of Arabidopsis thaliana (Col-0) in media with increasing mechanical stiffness”
e1“Finite element modeling of root hairs predicted decreased surface stress”
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