Abstract
The growth response of bean ( Phaseolus vulgaris L. ‘Pinto′) plants treated with 5 μg of brassinosteroid (BR) in the bean second‐internode assay was measured in a controlled environment under 3 radiation sources: cool white fluorescent (CWF), far‐red (FR) fluorescent and incandescent (INC) lamps. Growth comparisons were made under equal levels (90 μmol s ‐1 m ‐2 ) of photosynthetic photon flux density provided by CWF or INC lamps and equal levels of far‐red (28 W m ‐2 , 700–800 nm) radiation provided by the same INC or FR lamps. Treatment of the second internode with BR produced a sequential increase in elongation, curvature, and swelling under normal bioassay conditions (CWF lamps), as observed previously with brassins. In addition, BR induced marked splitting of the treated internode provided that ample photosynthate was available. Spectral quality had a differential effect on internodal elongation. Under CWF lamps, internodes, 6 days after BR‐treatment, were 2–3 times longer than those of controls; under INC or FR lamps they were 30–60% shorter than those of controls. In all cases, BR‐treatment greatly stimulated accumulation of photosynthate in the treated internode, as indicated by fresh and dry weights and stem diameter measurements. This suggests a possible mobilization role for BR in the intact plant. Brassinosteroid also partially overcame the natural inhibitory effects of CWF radiation on stem elongation.
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Claims 6
Claim · model-written summary
Brassinosteroid increased bean internode elongation, curvature and swelling under CWF lamps.
- Taxon
- beant0
- Treatment
- BRe0
- Outcome
- elongation, curvature, and swellinge0
- Direction
- increasee0
- Setting
- CWF lampse0
Not reportedComparator
Verbatim
e0“Treatment of the second internode with BR produced a sequential increase in elongation, curvature, and swelling under normal bioassay conditions (CWF lamps)”
t0“Influence of spectral quality on the growth response of intact bean plants to brassinosteroid, a growth‐promoting steroidal lactone. I. Stem elongation and morphogenesis”
Claim · model-written summary
Brassinosteroid induced splitting of treated bean internodes when photosynthate was ample.
- Taxon
- beant0
- Treatment
- BRe0
- Outcome
- splitting of the treated internodee0
- Qualifier
- ample photosynthate was availablee0
Not reportedComparatorDirection
Verbatim
e0“BR induced marked splitting of the treated internode provided that ample photosynthate was available”
t0“Influence of spectral quality on the growth response of intact bean plants to brassinosteroid, a growth‐promoting steroidal lactone. I. Stem elongation and morphogenesis”
Claim · model-written summary
Under CWF lamps, brassinosteroid-treated bean internodes were 2–3 times longer than controls.
Verbatim
e0“Under CWF lamps, internodes, 6 days after BR‐treatment, were 2–3 times longer than those of controls”
t0“Influence of spectral quality on the growth response of intact bean plants to brassinosteroid, a growth‐promoting steroidal lactone. I. Stem elongation and morphogenesis”
Claim · model-written summary
Under INC or FR lamps, brassinosteroid-treated bean internodes were 30–60% shorter than controls.
Verbatim
e0“under INC or FR lamps they were 30–60% shorter than those of controls”
t0“Influence of spectral quality on the growth response of intact bean plants to brassinosteroid, a growth‐promoting steroidal lactone. I. Stem elongation and morphogenesis”
t1“6 days after BR‐treatment”
Claim · model-written summary
Brassinosteroid stimulated photosynthate accumulation in treated bean internodes.
Not reportedComparator
Verbatim
e0“BR‐treatment greatly stimulated accumulation of photosynthate in the treated internode”
t0“Influence of spectral quality on the growth response of intact bean plants to brassinosteroid, a growth‐promoting steroidal lactone. I. Stem elongation and morphogenesis”
Claim · model-written summary
Brassinosteroid partly overcame CWF inhibition of bean stem elongation.
- Taxon
- beant0
- Treatment
- Brassinosteroide0
- Outcome
- stem elongatione0
- Direction
- overcamee0
- Setting
- CWF radiatione0
Not reportedComparator
Verbatim
e0“Brassinosteroid also partially overcame the natural inhibitory effects of CWF radiation on stem elongation”
t0“Influence of spectral quality on the growth response of intact bean plants to brassinosteroid, a growth‐promoting steroidal lactone. I. Stem elongation and morphogenesis”
The same questions in other papers
brassinolide · physiology: photosynthesis · Phaseolus vulgaris (common bean)Positive and negative results
1 in the opposite direction
- no effect
class · growth · Phaseolus vulgaris (common bean)Positive and negative results
11 papers in the same direction as this paper · 7 in the opposite direction
- negative
- no effect
- negative
15 papers more in this group
See all 19 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.