Abstract
The effects of awn removal on ear gas exchange in four barley lines (Morex, Harrington, Steptoe, and TR306) were studied under a controlled environment using a Before-After Control-Impact Paired (BACIP) experimental design. From ear emergence to grain maturity, plants were grown in pots at either 60 or 90 % of soil water holding capacity. Gas-exchange measurements of ears were made 9 and 10 d after anthesis (DAA). On 11 DAA, awn removal was performed on half of the ears in each pot, followed by measurements on both intact and de-awned ears on 12 and 13 DAA. Net photosynthetic (P N) and transpiration (E) rates decreased significantly with awn removal, but dark respiration (R D) rate was not affected. We estimated for each ear a temperature-adjusted respiration rate (R a) from R D. When we corrected P N with R a, we found that rates of spikelet photosynthesis were largely underestimated. Moderate water stress had minimal effect on gas exchange of bracts and awns of the barley ear. Barley lines did not differ for any individual gas-exchange parameter.
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Claims 5
Claim · model-written summary
Awn removal decreased net photosynthetic and transpiration rates of barley ears.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Treatment
- awn removale1
- Outcome
- Net photosynthetic (P N) and transpiration (E) ratese3
- Direction
- decreasede3
- Comparator
- intacte2
- Setting
- controlled environmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“The effects of awn removal on ear gas exchange in four barley lines (Morex, Harrington, Steptoe, and TR306) were studied under a controlled environment”
e2“awn removal was performed on half of the ears in each pot, followed by measurements on both intact and de-awned ears on 12 and 13 DAA”
e3“Net photosynthetic (P N) and transpiration (E) rates decreased significantly with awn removal”
Claim · model-written summary
Awn removal did not affect dark respiration rate of barley ears.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- awn removale1
- Outcome
- dark respiration (R D) ratee4
- Direction
- not affectede4
- Comparator
- intacte2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effects of awn removal on ear gas exchange in four barley lines (Morex, Harrington, Steptoe, and TR306) were studied under a controlled environment”
e2“awn removal was performed on half of the ears in each pot, followed by measurements on both intact and de-awned ears on 12 and 13 DAA”
e4“dark respiration (R D) rate was not affected”
Claim · model-written summary
Uncorrected measurements largely underestimated the rates of spikelet photosynthesis in barley ears.
- Taxon
- barleyHordeum vulgaree1
- Organ / stage
- spikelete5
- Outcome
- rates of spikelet photosynthesise5
- Direction
- largely underestimatede5
- Qualifier
- When we corrected P N with R ae5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effects of awn removal on ear gas exchange in four barley lines (Morex, Harrington, Steptoe, and TR306) were studied under a controlled environment”
e5“When we corrected P N with R a, we found that rates of spikelet photosynthesis were largely underestimated”
Claim · model-written summary
Moderate water stress had minimal effect on gas exchange of bracts and awns of the barley ear.
- Taxon
- barleyHordeum vulgaree6
- Organ / stage
- bracts and awnse6
- Treatment
- Moderate water stresse6
- Outcome
- gas exchange of bracts and awnse6
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Moderate water stress had minimal effect on gas exchange of bracts and awns of the barley ear”
Claim · model-written summary
The four barley lines did not differ in any individual gas-exchange parameter.
- Taxon
- barleyHordeum vulgaree1
- Material
- four barley lines (Morex, Harrington, Steptoe, and TR306)e1
- Outcome
- individual gas-exchange parametere7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The effects of awn removal on ear gas exchange in four barley lines (Morex, Harrington, Steptoe, and TR306) were studied under a controlled environment”
e7“Barley lines did not differ for any individual gas-exchange parameter”
The same questions in other papers
drought · physiology: gas exchange · Hordeum vulgare (barley)Positive and negative results
14 papers in the same direction as this paper · 2 in the opposite direction
- negative
- positive
- positive
13 papers more in this group
See all 17 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.