Abstract
Ethylene induces arenchyma formation in corn roots and other plant tissues, and abscisic acid (ABA) induces arenchyma in celery petioles. Pithiness (i.e., arenchyma) in celery can be measured as a decrease in density. Density was calculated for two cm long petiole segments by dividing their weight by their volume as calculated from the weight of water displaced upon immersion. The relationship between density (g/ml) and subjective pithiness rating (1 = none, 9 = severe) was linear (r 2 = 0.87). Petiole segments exposed to 0 to 200 ppm ethylene in air at 5C for two weeks did not exhibit any significant differences (p = 0.05) in density among the treatments. Entire petioles were treated with 0, 1, 10, and 100 μM ABA in water for 96 h at 25C. The petioles were cut into thirds and the center 2 cm from each portion was excised and the density measured. Although density decreased in the top to the bottom portions over all ABA conc, the differences were not significant. Density was significantly reduced in segments excised from the bottom and middle of petioles treated with 10 and 100 μM ABA, compared to 0 and 1 μM ABA. There also was a decrease in density with ABA conc in the top portion, but the decrease was only significant for the 100 μM ABA conc.
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Claims 5
Claim · model-written summary
Density was linearly related to subjective pithiness rating in celery petioles (r² = 0.87).
Not reportedTaxonOrgan / stageDirection
Verbatim
e0“The relationship between density (g/ml) and subjective pithiness rating (1 = none, 9 = severe) was linear (r 2 = 0.87).”
Claim · model-written summary
Ethylene treatments did not significantly differ in celery petiole density.
- Organ / stage
- Petiole segmentse0
- Treatment
- 0 to 200 ppm ethylenee0
- Outcome
- densitye0
- Direction
- did not exhibit any significant differencese0
- Comparator
- among the treatmentse0
Not reportedTaxon
Verbatim
e0“Petiole segments exposed to 0 to 200 ppm ethylene in air at 5C for two weeks did not exhibit any significant differences (p = 0.05) in density among the treatments.”
Claim · model-written summary
Density decreased from top to bottom petiole portions across ABA concentrations without significant differences.
Not reportedTaxon
Verbatim
e0“Although density decreased in the top to the bottom portions over all ABA conc, the differences were not significant.”
Claim · model-written summary
ABA at 10 and 100 μM reduced density in bottom and middle celery petiole segments relative to 0 and 1 μM.
- Organ / stage
- bottom and middle of petiolese0
- Treatment
- 10 and 100 μM ABAe0
- Outcome
- Densitye0
- Direction
- reducede0
- Comparator
- 0 and 1 μM ABAe0
Not reportedTaxon
Verbatim
e0“Density was significantly reduced in segments excised from the bottom and middle of petioles treated with 10 and 100 μM ABA, compared to 0 and 1 μM ABA.”
Claim · model-written summary
Density decreased with ABA concentration in top petiole portions, significantly only at 100 μM.
Not reportedTaxonComparator
Verbatim
e0“There also was a decrease in density with ABA conc in the top portion, but the decrease was only significant for the 100 μM ABA conc.”