Abstract
The contributions of cell division and cell elongation and the potential role of gibberellins in the far-red light stimulation of bean internode elongation were investigated. When bean plants, Phaseolus vulgaris cv. Kentucky Wonder, were grown in white light supplemented with far-red light a significant increase, up to threefold, in internode elongation was observed. Microscopic examination revealed that cell lengths were also increased but by a lower magnitude than internode length. Cell-labeling studies with [ 3 H]thymidine showed that nuclei labeling was increased in internodes receiving supplemental far-red light. Thus far-red light induced increased internode elongation is a result of both increased cell elongation and increased cell division. Gibberellins A 1 , A 20 , A 19 , A 44 , and A 4 and kaurenoic acid were identified in extracts of internode tissue by gas chromatography – mass spectroscopy using [ 2 H 2 ]-labeled internal standards for quantification. It thus appears that the early C-13 hydroxylation pathway is operative in the elongating internode. Endogenous GA 1 and GA 20 were approximately twofold higher in the first internodes of plants receiving supplemental far-red light. A comparison of the metabolism of exogenously supplied [ 2 H 2 ]GA 19 suggested that GA turnover was greater in tissues exposed to supplemental far-red light. These results indicate that both cell division and elongation contribute to the enhanced elongation response of bean internodes to far-red light and that these processes are correlated with an increase in GA levels and (or) metabolism. Keywords: Phaseolus, gibberellins, phytochrome, far-red light.
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Claims 8
Claim · model-written summary
Supplemental far-red light significantly increased bean internode elongation by up to threefold.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarise0 - Material
- Kentucky Wondere0
- Organ / stage
- internodee0
- Treatment
- white light supplemented with far-red lighte0
- Outcome
- internode elongatione0
- Direction
- increasee0
- Value
- up to threefolde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When bean plants, Phaseolus vulgaris cv. Kentucky Wonder, were grown in white light supplemented with far-red light a significant increase, up to threefold, in internode elongation was observed”
Claim · model-written summary
Supplemental far-red light increased bean internode cell length, by less than the increase in internode length.
Verbatim
e0“cell lengths were also increased but by a lower magnitude than internode length”
t0“Far-red light stimulates internode elongation, cell division, cell elongation, and gibberellin levels in bean”
Claim · model-written summary
Supplemental far-red light increased nuclei labeling in bean internodes, indicating increased cell division.
- Taxon
- beant0
- Organ / stage
- internodese0
- Treatment
- supplemental far-red lighte0
- Outcome
- nuclei labelinge0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“nuclei labeling was increased in internodes receiving supplemental far-red light”
t0“bean”
Claim · model-written summary
Gibberellins A 1, A 20, A 19, A 44, A 4, and kaurenoic acid were identified in bean internode extracts.
Verbatim
e0“Gibberellins A 1 , A 20 , A 19 , A 44 , and A 4 and kaurenoic acid were identified in extracts of internode tissue”
t0“bean”
Claim · model-written summary
The detected gibberellins suggest the early C-13 hydroxylation pathway operates in elongating bean internodes.
Verbatim
e0“It thus appears that the early C-13 hydroxylation pathway is operative in the elongating internode”
t0“bean”
Claim · model-written summary
Endogenous GA 1 and GA 20 were approximately twofold higher in first bean internodes under supplemental far-red light.
- Taxon
- beant0
- Organ / stage
- first internodese0
- Treatment
- supplemental far-red lighte0
- Outcome
- Endogenous GA 1 and GA 20e0
- Direction
- highere0
- Value
- approximately twofolde0
Not reportedComparator
Verbatim
e0“Endogenous GA 1 and GA 20 were approximately twofold higher in the first internodes of plants receiving supplemental far-red light”
t0“bean”
Claim · model-written summary
Comparison of labeled GA 19 metabolism suggested greater gibberellin turnover in bean tissue exposed to supplemental far-red light.
- Taxon
- beant0
- Treatment
- supplemental far-red lighte0
- Outcome
- GA turnovere0
- Direction
- greatere0
- Qualifier
- suggestede0
Not reportedComparator
Verbatim
e0“A comparison of the metabolism of exogenously supplied [ 2 H 2 ]GA 19 suggested that GA turnover was greater in tissues exposed to supplemental far-red light”
t0“bean”
Claim · model-written summary
The authors conclude both cell division and elongation contribute to the far-red-induced bean internode response.
Verbatim
e0“both cell division and elongation contribute to the enhanced elongation response of bean internodes to far-red light”
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See all 41 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.