Abstract
Crop Zn content is different between various crop species. The purpose of the present study was to determine Zn response in seed of three species of Brassica (B. napus, B. juncea and B. campestris) when exposed to different Zn supply levels (0, 1, 5, 10 and 20 mg kg -1 ) in pot experiment. The results showed that the activities of antioxidant enzymes, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) in leaf, and dry weights of plant, straw, leaf and seed increased at CZn 2+ 5 mg kg -1 . The highest seed dry weight of three species were observed in 5 mg kg -1 Zn treatment, increased by 37.7%, 82.6% and 18.0% compared to the controls, respectively. The ultrastructural damage was found in the root tip cells for B. napus and YR in the presence of 20 mg kg -1 Zn, while intact structure of the root tip cells was observed in B. campestris. The total amino acid content of root exudates in B. juncea and B. napus was significantly higher than that of B. campestris in the presence of 1 and 20 mg kg -1 Zn. High supply level of Zn 2+ (20 mg kg -1 ) could promote the secretion of amino acids in root exudates. Dry weight (stem, leaf and seed) of B. napus reveal a decreasing trend when Zn supplied at levels above 10 mg kg -1 . As the increase of Zn supply level, the concentrations of Zn in seed of rape revealed an increasing trend. The best Zn supply level for having more biomass and more Zn in seeds of rape without toxic effects was observed at 10 mg kg -1 . The highest of Zn concentration in seed were observed in B. napus may be due to due to more root exudates. Zinc concentration in Zn-highefficiency species is related to the absorption capacity of the plant's roots and the ability to change soil Zn availability
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Claims 15
Claim · model-written summary
At 5 mg kg -1 Zn, antioxidant enzyme activities, leaf gas exchange and plant dry weights increased.
- Treatment
- CZn 2+ 5 mg kg -1e1
- Outcome
- activities of antioxidant enzymes, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) in leafe1
- Direction
- increasede1
BrassicaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three species of Brassica (B. napus, B. juncea and B. campestris)”
e1“the activities of antioxidant enzymes, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) in leaf, and dry weights of plant, straw, leaf and seed increased at CZn 2+ 5 mg kg -1”
Claim · model-written summary
Seed dry weight in B. napus increased 37.7% at 5 mg kg -1 Zn versus controls.
- Taxon
- B. napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse0 - Treatment
- 5 mg kg -1 Zn treatmente1
- Outcome
- seed dry weighte1
- Direction
- increasede1
- Value
- 37.7%e1
- Comparator
- the controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“B. napus, B. juncea and B. campestris”
e1“The highest seed dry weight of three species were observed in 5 mg kg -1 Zn treatment, increased by 37.7%, 82.6% and 18.0% compared to the controls, respectively.”
Claim · model-written summary
Seed dry weight in B. juncea increased 82.6% at 5 mg kg -1 Zn versus controls.
- Taxon
- B. juncea
Brassica junceae0 - Treatment
- 5 mg kg -1 Zn treatmente1
- Outcome
- seed dry weighte1
- Direction
- increasede1
- Value
- 82.6%e1
- Comparator
- the controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“B. napus, B. juncea and B. campestris”
e1“The highest seed dry weight of three species were observed in 5 mg kg -1 Zn treatment, increased by 37.7%, 82.6% and 18.0% compared to the controls, respectively.”
Claim · model-written summary
Seed dry weight in B. campestris increased 18.0% at 5 mg kg -1 Zn versus controls.
- Taxon
- B. campestris
.jpg?width=60)
Brassica rapa subsp. oleiferae0 - Treatment
- 5 mg kg -1 Zn treatmente1
- Outcome
- seed dry weighte1
- Direction
- increasede1
- Value
- 18.0%e1
- Comparator
- the controlse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“B. napus, B. juncea and B. campestris”
e1“The highest seed dry weight of three species were observed in 5 mg kg -1 Zn treatment, increased by 37.7%, 82.6% and 18.0% compared to the controls, respectively.”
Claim · model-written summary
At 20 mg kg -1 Zn, root tip cells of B. napus showed ultrastructural damage.
- Taxon
- B. napusBrassica napuse0
- Organ / stage
- root tip cellse0
- Treatment
- 20 mg kg -1 Zne0
- Outcome
- ultrastructural damagee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ultrastructural damage was found in the root tip cells for B. napus and YR in the presence of 20 mg kg -1 Zn”
Claim · model-written summary
At 20 mg kg -1 Zn, YR root tip cells showed ultrastructural damage.
Not reportedComparatorDirection
Verbatim
e0“The ultrastructural damage was found in the root tip cells for B. napus and YR in the presence of 20 mg kg -1 Zn”
Claim · model-written summary
B. campestris root tip cells retained intact structure at 20 mg kg -1 Zn.
- Taxon
- B. campestrisBrassica rapa subsp. oleiferae0
- Treatment
- 20 mg kg -1 Zne1
- Outcome
- intact structure of the root tip cellse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“intact structure of the root tip cells was observed in B. campestris”
e1“in the presence of 20 mg kg -1 Zn”
Claim · model-written summary
Root exudate total amino acid content of B. juncea exceeded B. campestris at 1 and 20 mg kg -1 Zn.
- Taxon
- B. junceaBrassica junceae0
- Treatment
- 1 and 20 mg kg -1 Zne0
- Outcome
- total amino acid content of root exudatese0
- Direction
- highere0
- Comparator
- B. campestrise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total amino acid content of root exudates in B. juncea and B. napus was significantly higher than that of B. campestris in the presence of 1 and 20 mg kg -1 Zn.”
Claim · model-written summary
Root exudate total amino acid content of B. napus exceeded B. campestris at 1 and 20 mg kg -1 Zn.
- Taxon
- B. napusBrassica napuse0
- Treatment
- 1 and 20 mg kg -1 Zne0
- Outcome
- total amino acid content of root exudatese0
- Direction
- highere0
- Comparator
- B. campestrise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total amino acid content of root exudates in B. juncea and B. napus was significantly higher than that of B. campestris in the presence of 1 and 20 mg kg -1 Zn.”
Claim · model-written summary
High Zn supply at 20 mg kg -1 promoted amino acid secretion in root exudates.
Not reportedTaxonComparator
Verbatim
e0“High supply level of Zn 2+ (20 mg kg -1 ) could promote the secretion of amino acids in root exudates.”
Claim · model-written summary
B. napus stem, leaf and seed dry weight declined above 10 mg kg -1 Zn.
- Taxon
- B. napusBrassica napuse0
- Treatment
- Zn supplied at levels above 10 mg kg -1e0
- Outcome
- Dry weight (stem, leaf and seed)e0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry weight (stem, leaf and seed) of B. napus reveal a decreasing trend when Zn supplied at levels above 10 mg kg -1 .”
Claim · model-written summary
Seed Zn concentration in rape increased with Zn supply.
- Taxon
- rapeBrassica napuse0
- Treatment
- Zn supply levele0
- Outcome
- concentrations of Zn in seede0
- Direction
- increasinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As the increase of Zn supply level, the concentrations of Zn in seed of rape revealed an increasing trend.”
Claim · model-written summary
The authors identified 10 mg kg -1 Zn as the best supply level for rape biomass and seed Zn without toxicity.
- Taxon
- rapeBrassica napuse0
- Treatment
- 10 mg kg -1e0
- Outcome
- more biomass and more Zn in seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The best Zn supply level for having more biomass and more Zn in seeds of rape without toxic effects was observed at 10 mg kg -1 .”
Claim · model-written summary
B. napus had the highest seed Zn concentration, possibly due to greater root exudation.
- Taxon
- B. napusBrassica napuse0
- Outcome
- Zn concentration in seede0
- Qualifier
- more root exudatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest of Zn concentration in seed were observed in B. napus may be due to due to more root exudates.”
Claim · model-written summary
The authors relate seed Zn concentration in Zn-efficient species to root uptake capacity and altered soil Zn availability.
Verbatim
e0“Zinc concentration in Zn-highefficiency species is related to the absorption capacity of the plant's roots and the ability to change soil Zn availability”
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