Abstract
Summary Effects of mepiquat chloride on gradients of shoot growth within spring barley plants (cv. Koru) were determined in two small-scale field experiments. Mepiquat chloride was applied at either the lemma primordium stage or the late carpel primordium stage of spike development in the main shoot. The shoot dry weight, stem length, spike length, number and size of florets and floret developmental score were measured for all shoots, over the period from the lemma primordium stage of main shoot spike development to the late milk stage of grain development. Lemma primordium mepiquat chloride increased the size and developmental score of later-formed shorter shoots pre-anthesis while delaying the spike development of the main shoot and other longer shoots by up to 4 days. The overall effect was to produce plants with a reduced range of shoot and spike sizes from the end of floret initiation in the main shoot until maturity. In addition, there was a slight increase in the number of shoots per plant in both experiments. Gradients of carpel development and carpel width along the spike were reduced in all treated spikes by the time of floret abortion in the main shoot but the effects were more noticeable in shorter shoots. The number of florets initiated per plant was increased by 21–22%. All shoots contributed to the larger number of florets but again the major additions came from the shorter shoots. The few extra florets initiated in longer shoots were lost during abortion of distal florets while the 2–5 extra florets on shorter shoots were retained to give extra grains at maturity. Application of mepiquat chloride at the late carpel primordium stage had little effect on gradients of spike size or on number, size and development of florets.
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Claims 9
Claim · model-written summary
Mepiquat chloride applied at lemma primordium increased the size and developmental score of later-formed shorter shoots pre-anthesis.
- Taxon
- spring barley
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Hordeum vulgaret0 - Organ / stage
- later-formed shorter shootse0
- Treatment
- Lemma primordium mepiquat chloridee0
- Outcome
- size and developmental scoree0
- Direction
- increasede0
- Qualifier
- pre-anthesise0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Lemma primordium mepiquat chloride increased the size and developmental score of later-formed shorter shoots pre-anthesis while delaying the spike development of the main shoot and other longer shoots by up to 4 days”
t0“spring barley treated with mepiquat chloride”
Claim · model-written summary
Lemma primordium mepiquat chloride delayed spike development of the main shoot and other longer shoots by up to 4 days.
- Taxon
- spring barleyHordeum vulgaret0
- Organ / stage
- main shoot and other longer shootse0
- Treatment
- Lemma primordium mepiquat chloridee0
- Outcome
- spike developmente0
- Direction
- delayinge0
- Value
- up to 4 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lemma primordium mepiquat chloride increased the size and developmental score of later-formed shorter shoots pre-anthesis while delaying the spike development of the main shoot and other longer shoots by up to 4 days”
t0“spring barley treated with mepiquat chloride”
Claim · model-written summary
Mepiquat chloride treatment produced plants with a reduced range of shoot and spike sizes from the end of floret initiation in the main shoot until maturity.
- Taxon
- spring barleyHordeum vulgaret0
- Treatment
- mepiquat chloridet0
- Outcome
- range of shoot and spike sizese0
- Direction
- reducede0
- Qualifier
- from the end of floret initiation in the main shoot until maturitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The overall effect was to produce plants with a reduced range of shoot and spike sizes from the end of floret initiation in the main shoot until maturity”
t0“spring barley treated with mepiquat chloride”
Claim · model-written summary
Mepiquat chloride slightly increased the number of shoots per plant in both experiments.
- Taxon
- spring barleyHordeum vulgaret0
- Treatment
- mepiquat chloridet0
- Outcome
- number of shoots per plante0
- Direction
- increasee0
- Qualifier
- slighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a slight increase in the number of shoots per plant in both experiments”
t0“spring barley treated with mepiquat chloride”
Claim · model-written summary
Gradients of carpel development and carpel width along the spike were reduced in all treated spikes by the time of floret abortion in the main shoot, with more noticeable effects in shorter shoots.
- Taxon
- spring barleyHordeum vulgaret0
- Treatment
- mepiquat chloridet0
- Outcome
- Gradients of carpel development and carpel width along the spikee0
- Direction
- reducede0
- Qualifier
- more noticeable in shorter shootse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gradients of carpel development and carpel width along the spike were reduced in all treated spikes by the time of floret abortion in the main shoot but the effects were more noticeable in shorter shoots”
t0“spring barley treated with mepiquat chloride”
Claim · model-written summary
Mepiquat chloride increased the number of florets initiated per plant by 21-22%.
- Taxon
- spring barleyHordeum vulgaret0
- Treatment
- mepiquat chloridet0
- Outcome
- number of florets initiated per plante0
- Direction
- increasede0
- Value
- 21–22%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of florets initiated per plant was increased by 21–22%”
t0“spring barley treated with mepiquat chloride”
Claim · model-written summary
The 2-5 extra florets on shorter shoots were retained to give extra grains at maturity.
- Taxon
- spring barleyHordeum vulgaret0
- Organ / stage
- shorter shootse0
- Treatment
- mepiquat chloridet0
- Outcome
- extra grains at maturitye0
- Direction
- extrae0
- Value
- 2–5 extra floretse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 2–5 extra florets on shorter shoots were retained to give extra grains at maturity”
t0“spring barley treated with mepiquat chloride”
Claim · model-written summary
The few extra florets initiated in longer shoots were lost during abortion of distal florets.
- Taxon
- spring barleyHordeum vulgaret0
- Organ / stage
- longer shootse0
- Treatment
- mepiquat chloridet0
- Outcome
- extra florets initiated in longer shootse0
- Direction
- loste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The few extra florets initiated in longer shoots were lost during abortion of distal florets”
t0“spring barley treated with mepiquat chloride”
Claim · model-written summary
Mepiquat chloride applied at the late carpel primordium stage had little effect on gradients of spike size or on number, size and development of florets.
- Taxon
- spring barleyHordeum vulgaret0
- Treatment
- mepiquat chloride at the late carpel primordium stagee0
- Outcome
- gradients of spike size or on number, size and development of floretse0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of mepiquat chloride at the late carpel primordium stage had little effect on gradients of spike size or on number, size and development of florets”
t0“spring barley treated with mepiquat chloride”
The same questions in other papers
chloride · yield · Hordeum vulgare (barley)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
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.