Abstract
Monselise, S. P., and A. H. Halevy. (Hebrew U., Rehovot, Israel.) Effects of gibberellin and AMO–1618 on growth, dry-matter accumulation, chlorophyll content and peroxidase activity of citrus seedlings. Amer. Jour. Bot. 49(4): 405–412. Illus. 1962.—Sweet-lime seedlings, 6 months old, were sprayed with gibberellic acid (GA) and a growth retardant, AMO–1618, alone and in combination, at concentrations ranging between SO and 1600 ppm. Increasing concentrations of GA progressively increased shoot and internode length, did not influence number of leaves, and decreased leaf area. Dry weight of shoots was progressively increased up to 400 ppm, while dry weights of leaves and roots were decreased over all GA concentrations. Total dry weight of plants was increased by GA when related to leaf area or weight and to total chlorophyll content, which indicates a higher synthetic efficiency of leaves. This could not be detected by manometric determinations using leaf discs. It is suggested that a short determination period and/or work with detached leaves are responsible for failures to detect increased photosynthetic activity of GA-treated leaves. Chlorophyll content of leaves was decreased by increasing GA concentrations; it is shown that this is not due to “dilution” over a larger area of leaves. Peroxidase activity of leaves was only slightly reduced by GA, while it was increased by AMC–1618, acting as antagonist to GA. This is remarkable, since AMO–1618 did not clearly affect other procperties of citrus seedlings which are only slightly responsive to this chemical.
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Claims 12
Claim · model-written summary
Increasing GA increased shoot and internode length.
CitrusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“Increasing concentrations of GA progressively increased shoot and internode length”
Claim · model-written summary
GA did not influence leaf number.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“did not influence number of leaves”
e1“Increasing concentrations of GA progressively increased shoot and internode length”
Claim · model-written summary
Increasing GA decreased leaf area.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“decreased leaf area”
e1“Increasing concentrations of GA progressively increased shoot and internode length”
Claim · model-written summary
GA increased shoot dry weight up to 400 ppm.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“Dry weight of shoots was progressively increased up to 400 ppm”
e1“Increasing concentrations of GA progressively increased shoot and internode length”
Claim · model-written summary
GA decreased leaf and root dry weights.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“dry weights of leaves and roots were decreased over all GA concentrations”
Claim · model-written summary
GA increased total plant dry weight relative to leaf measures and chlorophyll.
- Treatment
- GAe0
- Outcome
- Total dry weight of plantse0
- Direction
- increasede0
- Comparator
- leaf area or weight and to total chlorophyll contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“Total dry weight of plants was increased by GA when related to leaf area or weight and to total chlorophyll content”
Claim · model-written summary
Leaf disc manometry did not detect the inferred increase in synthetic efficiency.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“This could not be detected by manometric determinations using leaf discs”
e1“Increasing concentrations of GA progressively increased shoot and internode length”
Claim · model-written summary
Increasing GA decreased leaf chlorophyll content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“Chlorophyll content of leaves was decreased by increasing GA concentrations”
Claim · model-written summary
The chlorophyll decrease was not due to dilution over a larger leaf area.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“this is not due to “dilution” over a larger area of leaves”
Claim · model-written summary
GA slightly reduced leaf peroxidase activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“Peroxidase activity of leaves was only slightly reduced by GA”
Claim · model-written summary
AMC–1618 increased leaf peroxidase activity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“it was increased by AMC–1618”
Claim · model-written summary
AMO–1618 did not clearly affect other seedling properties.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Citrus Seedlings”
e0“AMO–1618 did not clearly affect other procperties of citrus seedlings”
The same questions in other papers
Gibberellic acid · growth · CitrusResults differ
6 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
5 papers more in this group
See all 9 papers →Gibberellic acid · physiology: pigments · CitrusPositive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
Gibberellic acid · physiology: antioxidant enzymes · CitrusResults agree
1 paper in the same direction as this paper
- negative
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.