Abstract
Abstract Sorghum [ Sorghum bicolor (L.) Moench] exhibits a large degree of genetic diversity far shoot development, but diversity in root development has heen virtually unexplored. Tall and short lines of ‘kafir’ and ‘milo’ sorghum that were near‐isogenic for height were examined to determine if genes which control height also exert a similar inlluence on root growth. Lines were compared both in hydroponics and in soil‐filled (fine sandy loam, Udic Paleustalf) root chambers in the field. Since dwarfing genes in sorghum appear to mediate their response through regulation of endogenous gibberellin (GA) levels, effects of exogenous GA 3 applied to the shoot were also evaluated. In the field, differences in height of approximately 1 m developed between isolines of both kafir and milo, but the taller lines also developed 25 to 39% greater leaf areas. More roots were observed in the upper 60 cm of the soil profile in chambers containing the tall isolines, but when total root numbers were normalized with leaf area there were no differences between isolines. The GA 3 application to tall and 3‐dwarf milo plants in hydroponic culture stimulated internode length of both cultivars, but reduced leaf area, root length, and root volume. Shoot dry weights of the tall and short isolines were increased by 19.6 and 9.9%, respectively, by GA 3 treatment, while corresponding root dry weights decreased by 20.7 and 20.4 5%. These results are inconsistent with the hypothesis that gibberellins promote both shoot and root growth in sorghum, and further suggest that the genetic control of shoot growth in sorghum is largely independent from control of root growth.
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Claims 11
Claim · model-written summary
Tall and short isolines differed in height by approximately 1 m in the field.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“differences in height of approximately 1 m developed between isolines of both kafir and milo”
t0“Sorghum”
Claim · model-written summary
Taller isolines had 25 to 39% greater leaf areas.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the taller lines also developed 25 to 39% greater leaf areas.”
t0“Sorghum”
Claim · model-written summary
Tall isolines had more roots in the upper 60 cm of soil.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“More roots were observed in the upper 60 cm of the soil profile in chambers containing the tall isolines”
t0“Sorghum”
Claim · model-written summary
Root number per leaf area did not differ between isolines.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when total root numbers were normalized with leaf area there were no differences between isolines.”
t0“Sorghum”
Claim · model-written summary
GA 3 stimulated internode length in tall and 3-dwarf milo.
- Material
- tall and 3‐dwarf miloe0
- Treatment
- GA 3 applicatione0
- Outcome
- internode lengthe0
- Direction
- stimulatede0
- Setting
- hydroponic culturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The GA 3 application to tall and 3‐dwarf milo plants in hydroponic culture stimulated internode length of both cultivars”
t0“Sorghum”
Claim · model-written summary
GA 3 reduced leaf area, root length and root volume in hydroponic milo.
- Material
- tall and 3‐dwarf miloe0
- Treatment
- GA 3 applicatione0
- Outcome
- leaf area, root length, and root volumee0
- Direction
- reducede0
- Setting
- hydroponic culturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The GA 3 application to tall and 3‐dwarf milo plants in hydroponic culture stimulated internode length of both cultivars, but reduced leaf area, root length, and root volume.”
t0“Sorghum”
Claim · model-written summary
GA 3 increased shoot dry weight of tall isolines by 19.6%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot dry weights of the tall and short isolines were increased by 19.6 and 9.9%, respectively, by GA 3 treatment”
t0“Sorghum”
Claim · model-written summary
GA 3 increased shoot dry weight of short isolines by 9.9%.
- Material
- short isolinese0
- Treatment
- GA 3 treatmente0
- Outcome
- Shoot dry weightse0
- Direction
- increasede0
- Value
- 9.9%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot dry weights of the tall and short isolines were increased by 19.6 and 9.9%, respectively, by GA 3 treatment”
t0“Sorghum”
Claim · model-written summary
GA 3 decreased tall-isoline root dry weight by 20.7%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot dry weights of the tall and short isolines were increased by 19.6 and 9.9%, respectively, by GA 3 treatment, while corresponding root dry weights decreased by 20.7 and 20.4 5%.”
t0“Genetic and Hormonal Control of Shoot and Root Growth of Sorghum1”
Claim · model-written summary
GA 3 decreased short-isoline root dry weight by the reported 20.4 5%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot dry weights of the tall and short isolines were increased by 19.6 and 9.9%, respectively, by GA 3 treatment, while corresponding root dry weights decreased by 20.7 and 20.4 5%.”
t0“Genetic and Hormonal Control of Shoot and Root Growth of Sorghum1”
Claim · model-written summary
Shoot-growth genetic control appears largely independent of root-growth control.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the genetic control of shoot growth in sorghum is largely independent from control of root growth.”
The same questions in other papers
Gibberellic acid · growth · SorghumResults differ
14 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
12 papers more in this group
See all 16 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.