Abstract
In arid and semi-arid areas, drought and boron (B) toxicity are common deterrents to high crop yield. There seems to be an interaction of B toxicity with drought because B symptoms in the field often express under drought. This study examined the possible interaction of terminal drought and subsoil B on barley root growth and water use. A B-toxicity sensitive barley line was grown in PVC tubes in a plastic house using a randomized complete block design with three replicates. There were two factors: water level (normal vs. terminal drought) and B level (+B vs. −B in the subsoil between 20–60 cm depth). No significant drought by B interaction was detected for soil water content and for all plant characters measured. The +B tubes held more water than the −B tubes from 100 days after sowing. High subsoil-B level reduced root dry weight in the whole profile except in the 2nd and 5th 10-cm sections. In contrast, terminal drought had no effect on root growth. Results indicate that if a high level of subsoil B exists, uptake of water and soil nutrients may be depressed in nearly the whole soil profile, not only in the subsoil alone. This means that breeding for drought tolerance alone may not be adequate; B-toxicity tolerance is needed as well. The absence of drought by B interaction indicates that the effects of high B levels can be studied under either terminal drought or normal conditions, and vice versa.
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Claims 7
Claim · model-written summary
Drought and boron showed no significant interaction for soil water content or measured plant characters.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- drought by Be0
- Outcome
- soil water content and for all plant characters measurede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“No significant drought by B interaction was detected for soil water content and for all plant characters measured”
t0“BARLEY”
Claim · model-written summary
Tubes with boron held more water than those without boron from 100 days after sowing.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- +Be0
- Outcome
- watere0
- Direction
- moree0
- Qualifier
- from 100 days after sowinge0
- Comparator
- −Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The +B tubes held more water than the −B tubes from 100 days after sowing”
t0“BARLEY”
Claim · model-written summary
High subsoil boron reduced barley root dry weight across most of the profile except the second and fifth 10-cm sections.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- High subsoil-B levele0
- Outcome
- root dry weighte0
- Direction
- reducede0
- Qualifier
- except in the 2nd and 5th 10-cm sectionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High subsoil-B level reduced root dry weight in the whole profile except in the 2nd and 5th 10-cm sections”
t0“BARLEY”
Claim · model-written summary
Terminal drought had no effect on barley root growth.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- terminal droughte0
- Outcome
- root growthe0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“terminal drought had no effect on root growth”
t0“BARLEY”
Claim · model-written summary
The authors infer that high subsoil boron may depress uptake of water and soil nutrients throughout nearly the whole profile.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- high level of subsoil Be0
- Outcome
- uptake of water and soil nutrientse0
- Direction
- depressede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“if a high level of subsoil B exists, uptake of water and soil nutrients may be depressed in nearly the whole soil profile”
t0“BARLEY”
Claim · model-written summary
The authors recommend breeding for boron toxicity tolerance alongside drought tolerance.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- B-toxicity tolerance is needed as welle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“breeding for drought tolerance alone may not be adequate; B-toxicity tolerance is needed as well”
t0“BARLEY”
Claim · model-written summary
The authors conclude that high boron effects can be studied under terminal drought or normal conditions.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- effects of high B levels can be studied under either terminal drought or normal conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of high B levels can be studied under either terminal drought or normal conditions, and vice versa”
t0“BARLEY”
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