Abstract
In order to study the effect of source-sink restriction and various plant density on the remobilization of assimilates stored in vegetative parts to the ear corn hybrid single cross 704, a split-block experiment as randomized complete block design with three replications was carried out in Ahvaz in summer 2011. In this research the source restriction was imposed through defoliation of the leaves and the sink restriction was imposed by cutting theear at the end of pollination stage as the main factor including the defoliation of the upper leaves of the corn, defoliation of lower leaves, removal of 50% of the ear, and no defoliation and no ear removal (control) in main plots and the plant density as the sub factor including 60000 plants per hectare, 75000 plants per hectare (control) and 90000 plants per hectare in sub plots. Results indicated that source-sink restriction and plant density had significant effect on the rate, contribution, and efficiency of photosynthesis and assimilates remobilization. The highest grain yield by 868.67 g/m 2 belonged to the control treatment (no defoliation or ear removal)due to producing more grains and the heavier weight of 1000-grain and the lowest grain yield by 646.33 g/m 2 belonged to the treatment with the removal of 50% of ear due to significant decrease of grains in the corn and the number of grains per square meter in spite of the increase of the weight of 1000-grain. The treatment with 50% removal of ear had the lowest rate and contribution of remobilization (9.9%) because of the sink restriction, but the treatment with the defoliation of the upper leaves of the ear had the highest rate and contribution of remobilization (39.31%) due to significant decrease of rate and contribution of photosynthesis (60.69%).In this experiment, the increase of plant density increased the grain yield significantly because of the increase of the grains per square meter and the weight of 1000-grain despite the decrease of grains per ear so that the density of 90000 plants per hectare had the highest grain yield by 886.33 g/m 2 . This treatment devoted the least contribution of photosynthesis (71.74%) and the most contribution of remobilization (28.26%) in the production of grain yield to itself due to close competition among the plants especially further shadowing of the leaves. The interactive effect of the factors showed that the treatment with the defoliation of upper leaves of the ear and with density of 90000 plants per hectare had the highest contribution of remobilization (43.37%) and the lowest contribution of photosynthesis (56.63%) in grain weight which indicated that the decreasing effect of removal of the upper leaves of the ear and the increase of plant density on photosynthesis through the decrease of leaf area and the increase of leaves shadowing.
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Claims 16
Claim · model-written summary
Source-sink restriction and density significantly affected photosynthesis and assimilate remobilization rate, contribution and efficiency.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- source-sink restriction and plant densitye0
- Outcome
- rate, contribution, and efficiency of photosynthesis and assimilates remobilizatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“source-sink restriction and plant density had significant effect on the rate, contribution, and efficiency of photosynthesis and assimilates remobilization”
e1“ear corn hybrid single cross 704”
Claim · model-written summary
The untreated control had the highest grain yield, 868.67 g/m 2.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- no defoliation or ear removale0
- Outcome
- grain yielde0
- Direction
- higheste0
- Value
- 868.67 g/m 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest grain yield by 868.67 g/m 2 belonged to the control treatment (no defoliation or ear removal)”
t0“corn”
Claim · model-written summary
Removing 50% of the ear gave the lowest grain yield, 646.33 g/m 2.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- removal of 50% of eare0
- Outcome
- grain yielde0
- Direction
- loweste0
- Value
- 646.33 g/m 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lowest grain yield by 646.33 g/m 2 belonged to the treatment with the removal of 50% of ear”
t0“corn”
Claim · model-written summary
Removing 50% of the ear significantly decreased grain numbers but increased 1000-grain weight.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- removal of 50% of eare0
- Outcome
- grains in the corn and the number of grains per square metere0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“removal of 50% of ear due to significant decrease of grains in the corn and the number of grains per square meter in spite of the increase of the weight of 1000-grain”
Claim · model-written summary
Removing 50% of the ear increased 1000-grain weight.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- removal of 50% of eare0
- Outcome
- weight of 1000-graine0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“removal of 50% of ear due to significant decrease of grains in the corn and the number of grains per square meter in spite of the increase of the weight of 1000-grain”
t0“corn”
Claim · model-written summary
Ear removal produced the lowest remobilization rate and contribution, 9.9%.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 50% removal of eare0
- Outcome
- rate and contribution of remobilizatione0
- Direction
- loweste0
- Value
- 9.9%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The treatment with 50% removal of ear had the lowest rate and contribution of remobilization (9.9%)”
t0“corn”
Claim · model-written summary
Defoliating upper leaves produced the highest remobilization rate and contribution, 39.31%.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- defoliation of the upper leaves of the eare0
- Outcome
- rate and contribution of remobilizatione0
- Direction
- higheste0
- Value
- 39.31%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“defoliation of the upper leaves of the ear had the highest rate and contribution of remobilization (39.31%)”
t0“corn”
Claim · model-written summary
Upper-leaf defoliation significantly decreased photosynthesis contribution to 60.69%.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- rate and contribution of photosynthesise0
- Direction
- decreasee0
- Value
- 60.69%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant decrease of rate and contribution of photosynthesis (60.69%)”
t0“corn”
Claim · model-written summary
Increasing density significantly increased grain yield.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- increase of plant densitye0
- Outcome
- grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase of plant density increased the grain yield significantly”
t0“corn”
Claim · model-written summary
Increasing density increased grains per square meter and 1000-grain weight.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- grains per square meter and the weight of 1000-graine0
- Direction
- increasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increase of the grains per square meter and the weight of 1000-grain”
t0“corn”
Claim · model-written summary
Increasing density decreased grains per ear.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- grains per eare0
- Direction
- decreasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decrease of grains per ear”
t0“corn”
Claim · model-written summary
At 90000 plants per hectare, grain yield was highest at 886.33 g/m 2.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 90000 plants per hectaree0
- Outcome
- grain yielde0
- Direction
- higheste0
- Value
- 886.33 g/m 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“density of 90000 plants per hectare had the highest grain yield by 886.33 g/m 2”
t0“corn”
Claim · model-written summary
At 90000 plants per hectare, photosynthesis contribution was lowest at 71.74%.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- contribution of photosynthesise0
- Direction
- leaste0
- Value
- 71.74%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“least contribution of photosynthesis (71.74%)”
t0“corn”
Claim · model-written summary
At 90000 plants per hectare, remobilization contribution was highest at 28.26%.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- contribution of remobilizatione0
- Direction
- moste0
- Value
- 28.26%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most contribution of remobilization (28.26%)”
t0“corn”
Claim · model-written summary
Upper-leaf defoliation at 90000 plants per hectare gave the highest remobilization contribution, 43.37%.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- defoliation of upper leaves of the ear and with density of 90000 plants per hectaree0
- Outcome
- contribution of remobilizatione0
- Direction
- higheste0
- Value
- 43.37%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“defoliation of upper leaves of the ear and with density of 90000 plants per hectare had the highest contribution of remobilization (43.37%)”
t0“corn”
Claim · model-written summary
Upper-leaf defoliation at 90000 plants per hectare gave the lowest photosynthesis contribution, 56.63%.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- contribution of photosynthesise0
- Direction
- loweste0
- Value
- 56.63%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lowest contribution of photosynthesis (56.63%)”
t0“corn”
The same questions in other papers
density · yield · Zea mays (maize)Positive and negative results
518 papers in the same direction as this paper · 132 in the opposite direction · 7 reporting no difference from an alternative
- negative
- negative
- no effect
654 papers more in this group
See all 658 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.