Abstract
Plants of Plantago lanceolata L. and Zea mays L., cv. ‘Campo’ were grown at two levels of light intensity. Especially in the roots, the rate of dry matter accumulation decreased at low light intensity. The carbohydrate content of both roots and shoots of P. lanceolata was not affected by light intensity. The relative contribution of SHAM1-sensitive respiration, the alternative chain, to total root respiration of both P. lanceolata and Z. mays, was not affected by light intensity during the daytime. The alternative pathway was somewhat decreased at the end of the dark period, but not in the root tips (0–5 mm) where it still contributed 56% in respiration. It was, therefore, concluded that photosynthesis is not a major factor in regulation of root growth in the species investigated. To see whether the effect of light intensity on root growth rate was via transpiration, plants of Z. mays were grown at different air humidities. Both high humidity and low light intensity affected the root morphology in such a way that the distance between the apex and the first laterals on the primary root axis increased. It is suggested that this effect on root morphology is due to transpiration and the subsequent removal of root-produced inhibitors of lateral root growth; although light intensity also affected the rate of dry matter accumulation of roots and the rate was not affected by the humidity of the air. It is, therefore, concluded that the effect of light intensity on the rate of dry matter accumulation of roots of Z. mays is not via an effect on transpiration.
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Claims 12
Claim · model-written summary
Low light reduced root dry matter accumulation in the two species.
- Taxon
- Plantago lanceolata
Plantago lanceolatat0 - Treatment
- low light intensitye0
- Outcome
- rate of dry matter accumulatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Especially in the roots, the rate of dry matter accumulation decreased at low light intensity.”
t0“Plantago lanceolata”
Claim · model-written summary
Low light reduced root dry matter accumulation in maize.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Especially in the roots, the rate of dry matter accumulation decreased at low light intensity.”
t0“Zea mays”
Claim · model-written summary
Light intensity did not change root and shoot carbohydrate content in Plantago.
- Taxon
- P. lanceolataPlantago lanceolatae0
- Treatment
- light intensitye0
- Outcome
- carbohydrate content of both roots and shootse0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The carbohydrate content of both roots and shoots of P. lanceolata was not affected by light intensity.”
Claim · model-written summary
Daytime alternative respiration contribution was unaffected by light in Plantago.
- Taxon
- P. lanceolataPlantago lanceolatae0
- Treatment
- light intensitye0
- Outcome
- relative contribution of SHAM1-sensitive respiratione0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative contribution of SHAM1-sensitive respiration, the alternative chain, to total root respiration of both P. lanceolata and Z. mays, was not affected by light intensity during the daytime.”
Claim · model-written summary
Daytime alternative respiration contribution was unaffected by light in maize.
- Treatment
- light intensitye0
- Outcome
- relative contribution of SHAM1-sensitive respiratione0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative contribution of SHAM1-sensitive respiration, the alternative chain, to total root respiration of both P. lanceolata and Z. mays, was not affected by light intensity during the daytime.”
Claim · model-written summary
The alternative respiratory pathway decreased somewhat at the end of darkness, except in root tips, where it contributed 56%.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Organ / stage
- root tipse0
- Outcome
- alternative pathwaye0
- Direction
- decreasede0
- Value
- 56%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The alternative pathway was somewhat decreased at the end of the dark period, but not in the root tips (0–5 mm) where it still contributed 56% in respiration.”
t0“Plantago lanceolata”
Claim · model-written summary
High humidity increased distance from the root apex to the first laterals in maize.
- Treatment
- high humiditye0
- Outcome
- distance between the apex and the first laterals on the primary root axise0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both high humidity and low light intensity affected the root morphology in such a way that the distance between the apex and the first laterals on the primary root axis increased.”
t0“Zea mays”
Claim · model-written summary
Low light increased distance from the root apex to the first laterals in maize.
- Treatment
- low light intensitye0
- Outcome
- distance between the apex and the first laterals on the primary root axise0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both high humidity and low light intensity affected the root morphology in such a way that the distance between the apex and the first laterals on the primary root axis increased.”
t0“Zea mays”
Claim · model-written summary
Humidity did not affect maize root dry matter accumulation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate was not affected by the humidity of the air.”
t0“Zea mays”
Claim · model-written summary
The authors concluded that photosynthesis is not a major regulator of root growth in these species.
- Taxon
- Plantago lanceolataPlantago lanceolatat0
- Outcome
- root growthe0
- Qualifier
- photosynthesis is not a major factore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“photosynthesis is not a major factor in regulation of root growth in the species investigated.”
t0“Plantago lanceolata”
Claim · model-written summary
The authors suggest transpiration and removal of root-produced inhibitors explain the morphology response.
- Outcome
- effect on root morphologye0
- Qualifier
- transpiration and the subsequent removal of root-produced inhibitors of lateral root growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this effect on root morphology is due to transpiration and the subsequent removal of root-produced inhibitors of lateral root growth”
t0“Zea mays”
Claim · model-written summary
The authors concluded that light affects maize root dry matter accumulation independently of transpiration.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of light intensity on the rate of dry matter accumulation of roots of Z. mays is not via an effect on transpiration.”
The same questions in other papers
light · physiology: respiration · Zea mays (maize)Positive and negative results
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- positive
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light · yield · Zea mays (maize)Positive and negative results
30 papers in the same direction as this paper · 17 in the opposite direction
- positive
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44 papers more in this group
See all 48 papers →light · yield · Plantago lanceolata (narrow-leaved plantain)Results agree
2 papers in the same direction as this paper
- no effect
- no effect
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.