Abstract
The majority of cotton(Gossypium hirsutum L.) photosynthetic products comes from leaves, but non-foliar green organs of cotton such as bracts also contain chlorophyll and may contribute to the yield. We selected Xinluzao 33 and Xinluzao 46 with two irrigation treatments(normal drip irrigation and water-saving drip irrigation) to determine physiological indices including response curves of net photosynthetic rate(Pn), photosynthetically active radiation(PAR), intercellular CO2 concentration(Ci), fluorescence parameters, and water content of cotton bracts and leaves and to explore the difference of photosynthetic capacity between bracts and leaves under drip irrigation conditions. The results showed that bracts showed greater Ru BP regeneration/Ru BP carboxylation capacity ratio(Jmax/Vc,max) and lower stomatal conductance under high irradiance and temperature conditions. Photosynthetic area per plant, chlorophyll content, water content, Pn, the actual photochemical efficiency of PSII(ΦPSII), and Rubisco content were less in bracts than in leaves, but the decline of the indices showed a significantly faster in leaves than in bracts at the late growth stage. Compared with normal drip irrigation, the decreased degree of water content under water-saving drip irrigation was significantly higher in leaves than in bracts of cotton plants, and chlorophyll content, Pn, and Rubisco content decreased in leaves under water-saving drip irrigation, but there was no significant changed in bracts. The stabilities of bracts area, water content, chlorophyll content, Pn, ΦPSII, rubisco content in bracts were higher than those in leaves. It indicated the photosynthetic activity of leaves decreased rapidly. The bracts contributed approximate 7.22%–8.83% of the total photosynthate at the late growth stage under normal drip irrigation, and 10.24%–12.53% under water-saving drip irrigation. We concluded that bracts can increase the photosynthate of plant at the late growth stage under water-saving drip irrigation.
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Claims 11
Claim · model-written summary
Bracts had greater Ru BP regeneration/carboxylation capacity ratio than leaves.
- Taxon
- cotton
Gossypium hirsutume1 - Organ / stage
- bractse0
- Outcome
- Ru BP regeneration/Ru BP carboxylation capacity ratio(Jmax/Vc,max)e0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bracts showed greater Ru BP regeneration/Ru BP carboxylation capacity ratio(Jmax/Vc,max) and lower stomatal conductance under high irradiance and temperature conditions”
e1“cotton(Gossypium hirsutum L.)”
Claim · model-written summary
Bracts had lower stomatal conductance under high irradiance and temperature.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- bractse0
- Outcome
- stomatal conductancee0
- Direction
- lowere0
- Qualifier
- high irradiance and temperature conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bracts showed greater Ru BP regeneration/Ru BP carboxylation capacity ratio(Jmax/Vc,max) and lower stomatal conductance under high irradiance and temperature conditions”
e1“cotton(Gossypium hirsutum L.)”
Claim · model-written summary
Bracts had less photosynthetic area, chlorophyll, water, and Pn than leaves.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- bractse0
- Outcome
- Photosynthetic area per plant, chlorophyll content, water content, Pne0
- Direction
- lesse0
- Comparator
- leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic area per plant, chlorophyll content, water content, Pn, the actual photochemical efficiency of PSII(ΦPSII), and Rubisco content were less in bracts than in leaves”
e1“cotton(Gossypium hirsutum L.)”
Claim · model-written summary
Bracts had lower PSII photochemical efficiency and Rubisco content than leaves.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- bractse0
- Outcome
- actual photochemical efficiency of PSII(ΦPSII), and Rubisco contente0
- Direction
- lesse0
- Comparator
- leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the actual photochemical efficiency of PSII(ΦPSII), and Rubisco content were less in bracts than in leaves”
e1“cotton(Gossypium hirsutum L.)”
Claim · model-written summary
These photosynthetic indices declined significantly faster in leaves than bracts late in growth.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- leavese0
- Outcome
- decline of the indicese0
- Direction
- fastere0
- Comparator
- bractse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decline of the indices showed a significantly faster in leaves than in bracts at the late growth stage”
e1“cotton(Gossypium hirsutum L.)”
Claim · model-written summary
Water-saving irrigation caused a significantly greater water-content decline in leaves than bracts.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- leavese0
- Treatment
- water-saving drip irrigatione0
- Outcome
- decreased degree of water contente0
- Direction
- highere0
- Comparator
- normal drip irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with normal drip irrigation, the decreased degree of water content under water-saving drip irrigation was significantly higher in leaves than in bracts of cotton plants”
Claim · model-written summary
Water-saving irrigation reduced leaf chlorophyll content, Pn and Rubisco content.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- leavese0
- Treatment
- water-saving drip irrigatione0
- Outcome
- chlorophyll content, Pn, and Rubisco contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll content, Pn, and Rubisco content decreased in leaves under water-saving drip irrigation”
e1“cotton plants”
Claim · model-written summary
Bract chlorophyll content, Pn and Rubisco content did not significantly change under water-saving irrigation.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- bractse0
- Treatment
- water-saving drip irrigatione0
- Outcome
- chlorophyll content, Pn, and Rubisco contente0
- Direction
- no significant changede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll content, Pn, and Rubisco content decreased in leaves under water-saving drip irrigation, but there was no significant changed in bracts.”
e1“cotton plants”
Claim · model-written summary
Bract area, water, chlorophyll, Pn, PSII efficiency and Rubisco were more stable than leaf traits.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- bractse0
- Outcome
- stabilities of bracts area, water content, chlorophyll content, Pn, ΦPSII, rubisco contente0
- Direction
- highere0
- Comparator
- leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stabilities of bracts area, water content, chlorophyll content, Pn, ΦPSII, rubisco content in bracts were higher than those in leaves.”
e1“cotton(Gossypium hirsutum L.)”
Claim · model-written summary
Bracts contributed 7.22%–8.83% of late-stage total photosynthate under normal irrigation.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- bractse0
- Treatment
- normal drip irrigatione0
- Outcome
- total photosynthatee0
- Value
- 7.22%–8.83%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The bracts contributed approximate 7.22%–8.83% of the total photosynthate at the late growth stage under normal drip irrigation”
e1“cotton(Gossypium hirsutum L.)”
Claim · model-written summary
Bracts contributed 10.24%–12.53% under water-saving irrigation.
- Taxon
- cottonGossypium hirsutume2
- Organ / stage
- bractse1
- Treatment
- water-saving drip irrigatione0
- Outcome
- total photosynthatee1
- Value
- 10.24%–12.53%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“10.24%–12.53% under water-saving drip irrigation”
e1“The bracts contributed approximate 7.22%–8.83% of the total photosynthate”
e2“cotton(Gossypium hirsutum L.)”
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See all 25 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.