Abstract
Tea tree absorbs less calcium than other plants in the same soil usually.In order to probe the effects of excessive calcium fertilization on the photosynthetic physiology of tea leaves and provide the theoretical foundation to explain why the poor growth of tea tree in the soil with high calcium content,this study focused on the changes of chlorophyll content,the leaf photosynthesis,chlorophyll fluorescence parameters and chloroplast ultra-structure of tea leaves treated with excessive calcium using sand culture.The results indicate that the net photosynthetic rate and stomatal conductance of tea leaves are reduced with the increase of calcium concentration,and the leaf chlorophyll content,the primary photochemical efficiency(Fv/Fm),photosynthetic electron transport rate(ETR) and quantum yield of PSⅡ(ΦPSⅡ) are decreased as well,while the ratio of Chl a and Chl b and the minimum fluorescence(Fo) are increased with the increase of calcium concentration.Under the condition of excessive calcium fertilization,the chloroplast structure is destroyed.Meanwhile the growth of tea is restrained.The burl interval,the length of treetop,the amount of leaves and leaf area are lower than those of the control(CK).On the basis of above results,it is concluded that excessive calcium fertilization could damage the membrane of photosystem,and then block the electron photosynthetic rate and decrease light use efficiency of tea leaves,and finally slow down the growth rate of tea shoots.
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Claims 9
Claim · model-written summary
Increasing calcium reduced net photosynthetic rate and stomatal conductance.
- Taxon
- teae0
- Treatment
- increase of calcium concentratione0
- Outcome
- net photosynthetic rate and stomatal conductancee0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“net photosynthetic rate and stomatal conductance of tea leaves are reduced with the increase of calcium concentration”
Claim · model-written summary
Increasing calcium decreased chlorophyll content, Fv/Fm and ETR.
- Taxon
- tea tree
Camellia sinensist0 - Treatment
- increase of calcium concentratione1
- Outcome
- leaf chlorophyll content,the primary photochemical efficiency(Fv/Fm),photosynthetic electron transport rate(ETR)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tea tree”
e0“leaf chlorophyll content,the primary photochemical efficiency(Fv/Fm),photosynthetic electron transport rate(ETR) and quantum yield of PSⅡ(ΦPSⅡ) are decreased as well”
e1“reduced with the increase of calcium concentration”
Claim · model-written summary
Increasing calcium decreased PSII quantum yield.
- Taxon
- tea treeCamellia sinensist0
- Treatment
- increase of calcium concentratione1
- Outcome
- quantum yield of PSⅡ(ΦPSⅡ)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tea tree”
e0“quantum yield of PSⅡ(ΦPSⅡ) are decreased as well”
e1“reduced with the increase of calcium concentration”
Claim · model-written summary
Increasing calcium raised the Chl a to Chl b ratio and minimum fluorescence.
- Taxon
- tea treeCamellia sinensist0
- Treatment
- increase of calcium concentratione0
- Outcome
- ratio of Chl a and Chl b and the minimum fluorescence(Fo)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tea tree”
e0“the ratio of Chl a and Chl b and the minimum fluorescence(Fo) are increased with the increase of calcium concentration”
Claim · model-written summary
Excess calcium destroyed chloroplast structure.
- Taxon
- tea treeCamellia sinensist0
- Treatment
- excessive calcium fertilizatione0
- Outcome
- chloroplast structure is destroyede0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tea tree”
e0“Under the condition of excessive calcium fertilization,the chloroplast structure is destroyed”
Claim · model-written summary
Excess calcium restrained tea growth.
Not reportedComparator
Verbatim
e0“the growth of tea is restrained”
e1“excessive calcium fertilization”
Claim · model-written summary
Treated tea had lower burl interval, treetop length and leaf number than control.
- Taxon
- tea treeCamellia sinensist0
- Treatment
- excessive calcium fertilizatione1
- Outcome
- burl interval,the length of treetop,the amount of leavese0
- Direction
- lowere0
- Comparator
- control(CK)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tea tree”
e0“The burl interval,the length of treetop,the amount of leaves and leaf area are lower than those of the control(CK)”
e1“excessive calcium fertilization”
Claim · model-written summary
Treated tea had lower leaf area than control.
- Taxon
- tea treeCamellia sinensist0
- Treatment
- excessive calcium fertilizatione1
- Outcome
- leaf areae0
- Direction
- lowere0
- Comparator
- control(CK)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tea tree”
e0“leaf area are lower than those of the control(CK)”
e1“excessive calcium fertilization”
Claim · model-written summary
The authors conclude that excess calcium damages photosystem membranes and reduces electron transport and light use efficiency, slowing shoot growth.
- Taxon
- tea treeCamellia sinensist0
- Treatment
- excessive calcium fertilizatione0
- Outcome
- slow down the growth rate of tea shootse0
- Qualifier
- damage the membrane of photosystem,and then block the electron photosynthetic rate and decrease light use efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tea tree”
e0“excessive calcium fertilization could damage the membrane of photosystem,and then block the electron photosynthetic rate and decrease light use efficiency of tea leaves,and finally slow down the growth rate of tea shoots”
The same questions in other papers
calcium atom · growth · Camellia sinensis (black tea)Results differ
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
fertilization · soil: physics · Camellia sinensis (black tea)Positive and negative results
2 in the opposite direction
- positive
- positive
fertilization · growth · Camellia sinensis (black tea)Positive and negative results
2 papers in the same direction as this paper · 26 in the opposite direction
- positive
- positive
- positive
25 papers more in this group
See all 29 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.