Abstract
Maize (Zea mays L.) grown in drought- prone environments often face a multitude of abiotic stresses like desiccation, aluminum-toxicity and heat. The aim of the present study was to ascertain differences in root morphology in response to desiccation, heat and aluminum stress in tropical maize inbred lines used for research towards drought tolerance at flowering by CIMMYT; K64R, SC-Malawi and Ac7729TZSRW are sus- ceptible, while H16, CML444 and Ac7643 are tolerant. Plants were grown on germination blotter in growth pouches until the V2 stage. The lengths of axile and lat- eral roots were measured non-destructively at 4, 6, 8 and 10 days after germination by scanning with an A4 flatbed scanner followed by digital image analysis. All lines were subjected to aluminum (AlCl3) in the range from 0 to 15 mmol at a pH of 4.3, high temperature of 37°C, and des- iccation stress induced by Polyethylene glycol 8000 (PEG) concentrations of 15% and 20%. Elongation of lat- eral and axile roots were reduced in response to desicca- tion, heat and aluminum stress. H16 was most tolerant to aluminum; H16, CML444 and SC-Malawi were less se- verely affected by high temperatures. H16 and CML444 were not tolerant to desiccation in the present study, in- dicating that their yielding ability observed under drought is rather related to drought avoidance. This find- ing is corroborated by the finding that under desiccation stress growth of seminal axile roots was reduced in favor of the primary axile root. Under field conditions this pat- tern will allow the plant to avoid desiccation by reaching greater depths and tap water potentially available in deeper soil strata.
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Claims 7
Claim · model-written summary
Desiccation reduced lateral and axile root elongation.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE (ZEA MAYS L.)”
e0“Elongation of lat- eral and axile roots were reduced in response to desicca- tion, heat and aluminum stress”
Claim · model-written summary
Heat reduced lateral and axile root elongation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE (ZEA MAYS L.)”
e0“Elongation of lat- eral and axile roots were reduced in response to desicca- tion, heat and aluminum stress”
Claim · model-written summary
Aluminum stress reduced lateral and axile root elongation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE (ZEA MAYS L.)”
e0“Elongation of lat- eral and axile roots were reduced in response to desicca- tion, heat and aluminum stress”
Claim · model-written summary
H16 was the most tolerant line to aluminum.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE (ZEA MAYS L.)”
e0“H16 was most tolerant to aluminum”
Claim · model-written summary
H16, CML444 and SC-Malawi were less affected by high temperatures.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE (ZEA MAYS L.)”
e0“H16, CML444 and SC-Malawi were less se- verely affected by high temperatures”
Claim · model-written summary
H16 and CML444 were not tolerant to desiccation.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE (ZEA MAYS L.)”
e0“H16 and CML444 were not tolerant to desiccation in the present study”
Claim · model-written summary
Under desiccation, seminal axile root growth decreased relative to primary axile root growth.
- Treatment
- desiccation stresse0
- Outcome
- growth of seminal axile rootse0
- Direction
- reducede0
- Comparator
- primary axile roote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“MAIZE (ZEA MAYS L.)”
e0“under desiccation stress growth of seminal axile roots was reduced in favor of the primary axile root”
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