Abstract
The aim of the study was to measure the tensile strength of 4-year-old alfalfa leaves cultivated from seeds exposed to pre-sowing stimulation with He-Ne laser light for 1 or 5 min (designated respectively as F1 and F5) and alternating magnetic field with the exposure time of 1 or 5 min (respectively, L1 and L5). The leaves were measured in terms of blade length and width as well as petiole thickness prior to the tensile test. Measurements were also conducted to determine the chlorophyll fluorescence lifetime and content of photosynthetic pigments (chlorophyll a, b, a + b and carotenoids). The observed tensile strength was between 1.59 and 2.45 N. In the test group, the observed strength was lower in leaves collected from the top and central section of the stem but higher in the bottom part of the stem as compared to the control. The maximum increase of the tearing tensile force relative to the control (C) was observed for the L1 and F1 stimulation samples in leaves collected from the top and bottom parts of the stem, while the maximum decrease for that force was recorded for L5 leaves from the middle and top part of the stem. Chlorophyll fluorescence lifetimes and the overall content of photosynthetic pigments (chlorophyll a and b and carotenoids) were noticeably decreased in the leaves subjected to the stressors/stimulants applied. The results obtained for F1, L5 and, L1 stimulation revealed a decrease in fluorescence lifetimes. The content of photosynthetic pigments was also decreased under the influence of laser light stimulation (L1). This was a clear indication of plant ageing.
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Claims 9
Claim · model-written summary
Leaf tensile strength ranged from 1.59 to 2.45 N.
- Taxon
- alfalfa
Medicago sativat0 - Outcome
- tensile strengthe0
- Value
- between 1.59 and 2.45 Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The observed tensile strength was between 1.59 and 2.45 N.”
t0“alfalfa”
Claim · model-written summary
Stimulation lowered leaf strength in top and central stem sections.
- Taxon
- alfalfaMedicago sativat0
- Organ / stage
- leaves collected from the top and central section of the steme0
- Treatment
- test groupe1
- Outcome
- strengthe0
- Direction
- lowere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the observed strength was lower in leaves collected from the top and central section of the stem but higher in the bottom part of the stem as compared to the control”
t0“alfalfa”
e1“In the test group, the observed strength was lower in leaves collected from the top and central section of the stem but higher in the bottom part of the stem as compared to the control.”
Claim · model-written summary
Stimulation raised leaf strength in the bottom stem section.
- Taxon
- alfalfaMedicago sativat0
- Organ / stage
- bottom part of the steme0
- Treatment
- test groupe1
- Outcome
- strengthe0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the observed strength was lower in leaves collected from the top and central section of the stem but higher in the bottom part of the stem as compared to the control”
t0“alfalfa”
e1“In the test group, the observed strength was lower in leaves collected from the top and central section of the stem but higher in the bottom part of the stem as compared to the control.”
Claim · model-written summary
L1 and F1 gave maximum increases in tearing force for top and bottom leaves.
- Taxon
- alfalfaMedicago sativat0
- Organ / stage
- leaves collected from the top and bottom parts of the steme0
- Treatment
- L1 and F1 stimulatione0
- Outcome
- tearing tensile forcee0
- Direction
- increasee0
- Comparator
- control (C)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum increase of the tearing tensile force relative to the control (C) was observed for the L1 and F1 stimulation samples in leaves collected from the top and bottom parts of the stem”
t0“alfalfa”
Claim · model-written summary
L5 produced the maximum decrease in tearing force in middle and top leaves.
- Taxon
- alfalfaMedicago sativat0
- Organ / stage
- leaves from the middle and top part of the steme0
- Treatment
- L5e0
- Outcome
- tearing tensile forcee1
- Direction
- decreasee0
- Comparator
- control (C)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum decrease for that force was recorded for L5 leaves from the middle and top part of the stem”
t0“alfalfa”
e1“The maximum increase of the tearing tensile force relative to the control (C) was observed for the L1 and F1 stimulation samples in leaves collected from the top and bottom parts of the stem”
Claim · model-written summary
Stimulation decreased chlorophyll fluorescence lifetimes.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- stressors/stimulants appliede0
- Outcome
- Chlorophyll fluorescence lifetimese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll fluorescence lifetimes and the overall content of photosynthetic pigments (chlorophyll a and b and carotenoids) were noticeably decreased in the leaves subjected to the stressors/stimulants applied.”
t0“alfalfa”
Claim · model-written summary
Stimulation decreased photosynthetic pigment content.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- stressors/stimulants appliede0
- Outcome
- overall content of photosynthetic pigments (chlorophyll a and b and carotenoids)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll fluorescence lifetimes and the overall content of photosynthetic pigments (chlorophyll a and b and carotenoids) were noticeably decreased in the leaves subjected to the stressors/stimulants applied.”
t0“alfalfa”
Claim · model-written summary
F1, L5 and L1 decreased fluorescence lifetimes.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- F1, L5 and, L1 stimulatione0
- Outcome
- fluorescence lifetimese0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“F1, L5 and, L1 stimulation revealed a decrease in fluorescence lifetimes.”
t0“alfalfa”
Claim · model-written summary
L1 laser stimulation decreased photosynthetic pigment content.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- laser light stimulation (L1)e0
- Outcome
- content of photosynthetic pigmentse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The content of photosynthetic pigments was also decreased under the influence of laser light stimulation (L1).”
t0“alfalfa”
The same questions in other papers
light · physiology: photosynthesis · Medicago sativa (alfalfa)Positive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- positive
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See all 7 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.