Abstract
The parts played by constant amounts of visible radiation per day and its two components—daylength and intensity—in influencing the growth of Cucumis sativus have been investigated. The amount of radiation per day had a far greater influence than either of its components per se. Nevertheless, small significant effects of photoperiod were found, leaf expansion and dry weight increase being greatest at daylengths between 10 and 15 hr. rather than with longer days which, with similar daily totals, would be expected to give the greatest amounts of assimilation. Rates of leaf production and appearance were greatest with the highest amounts of radiation, but the rates of expansion of individual leaves and their maximum areas were greatest with intermediate amounts of radiation. This response resulted in an optimum curve relating the leaf surface and the dry weight attained after a given period to radiation. The amount of radiation giving the maximum leaf surface and dry weight decreased with age and with external nutrient supply, but at any one age was higher for increase in dry weight than for increase in leaf surface; stem and root tissues responded more to high radiation than did the leaf surface. The net assimilation rate was a linear function of visible radiation over the range of 15–120 cal. cm.-2 day-1 explored, the highest value of radiation used representing the intensity at which photosynthesis would be expected to be maximal over a 12–15 hr. day. The inhibitory effect of high radiation on leaf expansion and the resultant influence on the growth of the plant are explained in terms of the number and intensity of ‘sinks’ for carbohydrate and mineral nutrients within the plant.
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Claims 11
Claim · model-written summary
The amount of radiation per day had a far greater influence on growth than either of its components (daylength and intensity).
- Taxon
- Cucumis sativus
Cucumis sativuse0 - Treatment
- amount of radiation per daye1
- Outcome
- growthe0
- Direction
- far greatere1
- Comparator
- either of its componentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e1“The amount of radiation per day had a far greater influence than either of its components per se”
Claim · model-written summary
Small significant effects of photoperiod: leaf expansion and dry weight increase were greatest at daylengths of 10 to 15 hr rather than with longer days.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- photoperiode2
- Outcome
- leaf expansion and dry weight increasee2
- Direction
- greateste2
- Value
- 10 and 15 hre2
- Comparator
- longer dayse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e2“small significant effects of photoperiod were found, leaf expansion and dry weight increase being greatest at daylengths between 10 and 15 hr. rather than with longer days”
Claim · model-written summary
Rates of leaf production and appearance were greatest with the highest amounts of radiation.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- amounts of radiatione3
- Outcome
- Rates of leaf production and appearancee3
- Direction
- greateste3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e3“Rates of leaf production and appearance were greatest with the highest amounts of radiation”
Claim · model-written summary
Rates of expansion of individual leaves and their maximum areas were greatest with intermediate amounts of radiation.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- intermediate amounts of radiatione4
- Outcome
- the rates of expansion of individual leaves and their maximum arease4
- Direction
- greateste4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e4“the rates of expansion of individual leaves and their maximum areas were greatest with intermediate amounts of radiation”
Claim · model-written summary
Leaf expansion and growth response to radiation formed an optimum curve relating leaf surface and dry weight after a given period to radiation.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- radiatione5
- Outcome
- the leaf surface and the dry weight attained after a given periode5
- Direction
- optimume5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e5“This response resulted in an optimum curve relating the leaf surface and the dry weight attained after a given period to radiation”
Claim · model-written summary
The amount of radiation giving maximum leaf surface and dry weight decreased with plant age.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- agee6
- Outcome
- The amount of radiation giving the maximum leaf surface and dry weighte6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e6“The amount of radiation giving the maximum leaf surface and dry weight decreased with age and with external nutrient supply”
Claim · model-written summary
The amount of radiation giving maximum leaf surface and dry weight decreased with external nutrient supply.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- external nutrient supplye6
- Outcome
- The amount of radiation giving the maximum leaf surface and dry weighte6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e6“The amount of radiation giving the maximum leaf surface and dry weight decreased with age and with external nutrient supply”
Claim · model-written summary
At any one age, the radiation amount giving the maximum was higher for dry weight increase than for leaf surface increase.
- Taxon
- Cucumis sativusCucumis sativuse0
- Outcome
- increase in dry weighte7
- Direction
- highere7
- Comparator
- increase in leaf surfacee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e7“at any one age was higher for increase in dry weight than for increase in leaf surface”
Claim · model-written summary
Stem and root tissues responded more to high radiation than did the leaf surface.
- Taxon
- Cucumis sativusCucumis sativuse0
- Organ / stage
- stem and root tissuese1
- Treatment
- high radiatione1
- Outcome
- respondede1
- Direction
- moree1
- Comparator
- the leaf surfacee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e1“stem and root tissues responded more to high radiation than did the leaf surface”
Claim · model-written summary
The inhibitory effect of high radiation on leaf expansion is explained by the number and intensity of sinks for carbohydrate and mineral nutrients.
- Taxon
- Cucumis sativusCucumis sativuse0
- Outcome
- The inhibitory effect of high radiation on leaf expansione2
- Qualifier
- number and intensity ofe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e2“The inhibitory effect of high radiation on leaf expansion and the resultant influence on the growth of the plant are explained in terms of the number and intensity of”
Claim · model-written summary
The net assimilation rate was a linear function of visible radiation over 15–120 cal. cm.-2 day-1.
- Taxon
- Cucumis sativusCucumis sativuse0
- Treatment
- visible radiatione3
- Outcome
- net assimilation ratee3
- Value
- 15–120 cal. cm.-2 day-1e3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in influencing the growth of Cucumis sativus”
e3“The net assimilation rate was a linear function of visible radiation over the range of 15–120 cal. cm.-2 day-1 explored”
The same questions in other papers
light · growth · Cucumis sativus (cucumber)Results differ
52 papers in the same direction as this paper · 29 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
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See all 83 papers →radiation · yield · Cucumis sativus (cucumber)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- positive
- negative
- negative
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See all 8 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.