Abstract
Abstract Root response mechanisms for acid soil tolerance adaptability are generally unknown. Sorghum [Sorghum bicolor (L.) Moench] cultivars (Funk G522DR, GP140, SC599, TAM428, SC283, and SC574) were grown in white quartz flintshot sand and watered with 0.01M sodium acetate buffer at pH 4.0, 4.5, 5.0, 5.5, or 6.0 and Ca++ (0, 10, 100 mgl‐1 as CaCl2) or Mn++ (0, 1.4, or 140.0 mgl‐1 as HnCl2). At the acid soil tolerance impact response phase (< 10 days old), Ca++ did not influence initial root growth. Increased H+ concentration inhibited juvenile root growth equivalently in all six cultivars. This inhibition was reversed by exogenous GA3 in Funks G522DR but not in SC283 or SC574. Excess Mn++ (140 mgl‐1) further decreased root growth. Induction of an auxinase inhibitor by GA3 would support a hypothesis of H+ concentration influence on IAA transport and/or availability. Root growth matched IAA water partitioning and exogenous IAA (10‐10 and 10‐9 M) reversed the H+ concentration influence on root growth of SC283. We suggest that low pH (<4.8) soil influence on root growth is explicable as an influence on IAA synthesis and/or transport and that excess Mn++, which is known to induce IAA oxidation, further exacerbates the deleterious growing conditions. Notes This research was supported by State Hatch funds allocated to Projects 1308 and 1408, Georgia Agricultural Experiment Stations.
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Claims 8
Claim · model-written summary
Ca++ did not influence initial root growth of sorghum seedlings in the acid soil tolerance impact response phase.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Ca++ did not influence initial root growth”
t0“Sorghum seedling root growth”
Claim · model-written summary
Increased H+ concentration inhibited juvenile root growth equivalently in all six sorghum cultivars.
- Treatment
- Increased H+ concentratione1
- Outcome
- juvenile root growthe1
- Direction
- inhibitede1
- Qualifier
- equivalently in all six cultivarse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Increased H+ concentration inhibited juvenile root growth equivalently in all six cultivars”
t0“Sorghum seedling root growth”
Claim · model-written summary
The H+-induced inhibition of root growth was reversed by exogenous GA3 in cultivar Funks G522DR.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This inhibition was reversed by exogenous GA3 in Funks G522DR but not in SC283 or SC574”
t0“Sorghum seedling root growth”
Claim · model-written summary
The H+-induced inhibition of root growth was not reversed by exogenous GA3 in cultivars SC283 or SC574.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“This inhibition was reversed by exogenous GA3 in Funks G522DR but not in SC283 or SC574”
t0“Sorghum seedling root growth”
Claim · model-written summary
Excess Mn++ at 140 mg l-1 further decreased sorghum root growth.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Excess Mn++ (140 mgl‐1) further decreased root growth”
t0“Sorghum seedling root growth”
Claim · model-written summary
Exogenous IAA at 10-10 and 10-9 M reversed the H+ concentration influence on root growth of cultivar SC283.
- Material
- SC283e1
- Treatment
- exogenous IAA (10‐10 and 10‐9 M)e1
- Outcome
- the H+ concentration influence on root growthe1
- Direction
- reversede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“exogenous IAA (10‐10 and 10‐9 M) reversed the H+ concentration influence on root growth of SC283”
t0“Sorghum seedling root growth”
Claim · model-written summary
Sorghum root growth matched IAA water partitioning.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Root growth matched IAA water partitioning”
t0“Sorghum seedling root growth”
Claim · model-written summary
The authors suggest that the influence of low pH (<4.8) soil on sorghum root growth is explicable as an influence on IAA synthesis and/or transport.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We suggest that low pH (<4.8) soil influence on root growth is explicable as an influence on IAA synthesis and/or transport”
t0“Sorghum seedling root growth”
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