Abstract
The first of 2 studies reported in this paper investigated the variation in 15 barley genotypes for the durations of 3 periods of pre-anthesis development [leaf initiation (LI), spikelet initiation (SI), and spikelet growth (SG) phases], and the degree of independence of the duration of the SG phase from each of the LI and SI phases. There were differences between genotypes in the duration of the SI and SG phases which were not closely correlated ( r = – 0·58, P < 0·05) across genotypes, indicating the feasibility of genetically combining different durations of the 2 phases while maintaining a constant time to anthesis. The duration of the LI phase was closely correlated with time to anthesis ( r = 0·82, P < 0·001) but not with the duration of either the SI or SG phase. The rate and duration of spikelet initiation were negatively correlated across genotypes ( r = – 0·75, P < 0·01). There was little variation in the number of spikelet primordia formed over the range of genotypes but there was considerable variation in the number of aborted spikelet primordia. The study indicated the likelihood that in breeding to increase the yield potential of the spike in barley, there is more potential for reducing the level of spikelet primordia abortion during the SG phase than increasing the number of spikelet primordia per spike. The second study investigated whether 3 photoperiod regimes (15·5, 14, and 12–13 h), imposed for the duration of the LI and SI phase, had any subsequent effect on the duration of the SG phase in 2 cultivars, Bandulla and Galleon. There were no major effects, suggesting that the duration of the SG phase was largely independent of the duration of the 2 previous phases.
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Claims 9
Claim · model-written summary
Genotypes differed in SI and SG phase duration.
Verbatim
e0“There were differences between genotypes in the duration of the SI and SG phases”
t0“barley”
Claim · model-written summary
SI and SG durations were not closely correlated across genotypes.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Material
- genotypese0
- Outcome
- not closely correlatede0
- Value
- r = – 0·58e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“which were not closely correlated ( r = – 0·58, P < 0·05) across genotypes”
t0“barley”
Claim · model-written summary
LI duration correlated closely with anthesis timing.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- LI phasee0
- Outcome
- time to anthesise0
- Value
- r = 0·82e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The duration of the LI phase was closely correlated with time to anthesis ( r = 0·82, P < 0·001)”
t0“barley”
Claim · model-written summary
LI duration was not correlated with SI or SG duration.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- SI or SG phasee0
- Outcome
- duration of either the SI or SG phasee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not with the duration of either the SI or SG phase”
t0“barley”
Claim · model-written summary
Spikelet initiation rate and duration were negatively correlated.
- Taxon
- barleyHordeum vulgaret0
- Material
- genotypese0
- Outcome
- rate and duration of spikelet initiatione0
- Direction
- negatively correlatede0
- Value
- r = – 0·75e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate and duration of spikelet initiation were negatively correlated across genotypes ( r = – 0·75, P < 0·01)”
t0“barley”
Claim · model-written summary
Spikelet primordia number varied little across genotypes.
- Taxon
- barleyHordeum vulgaret0
- Material
- genotypese0
- Outcome
- number of spikelet primordiae0
- Direction
- little variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was little variation in the number of spikelet primordia formed over the range of genotypes”
t0“barley”
Claim · model-written summary
Aborted spikelet primordia varied considerably.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- number of aborted spikelet primordiae0
- Direction
- considerable variatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was considerable variation in the number of aborted spikelet primordia”
t0“barley”
Claim · model-written summary
Reducing spikelet abortion has more yield potential than increasing primordia number.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- reducing the level of spikelet primordia abortion during the SG phasee0
- Comparator
- increasing the number of spikelet primordia per spikee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is more potential for reducing the level of spikelet primordia abortion during the SG phase than increasing the number of spikelet primordia per spike”
t0“barley”
Claim · model-written summary
Photoperiod regimes during LI and SI had no major subsequent effect on SG duration.
- Taxon
- barleyHordeum vulgaret0
- Material
- Bandulla and Galleone0
- Treatment
- photoperiod regimes (15·5, 14, and 12–13 h)e0
- Outcome
- duration of the SG phasee0
- Direction
- no major effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“3 photoperiod regimes (15·5, 14, and 12–13 h), imposed for the duration of the LI and SI phase, had any subsequent effect on the duration of the SG phase in 2 cultivars, Bandulla and Galleon. There were no major effects”
t0“barley”
The same questions in other papers
light · growth · Hordeum vulgare (barley)Positive and negative results
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- negative
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See all 37 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.