Abstract
The root exudates of two genotypes of Brassica parachinensis,DEHP high-accumulating Youqing-60 and low-accumulating Teqing-60 which were cultivated in hydroponic systems contaminated with DEHP(20 mg.L-1 and 50 mg.L-1)were collected by sterilized distilled water at 15th and 30th day to investigate their effects on the desorption of DEHP in paddy soil and on the accumulation of DEHP in root and shoot of two genotypes of Brassica parachinensis.The results showed that DEHP concentrations in supernatant of treatments added root exudates were higher than that added distilled water(1.9~26.6 times),indicating that root exudates of two genotypes of Brassica parachinensis improved significantly DEHP desorption in paddy soil.With the increase of DEHP concentrations in hydroponic systems,the effects of both two genotypes of Brassica parachinensis root exudates on DEHP desorption in paddy soil increased,and significant differences were observated between some treatments.DEHP concentrations in supernatant of treatments added Youqing-60 root exudates were higher by 0.6~3.6 times than those added Teqing-60 root exudates.Moreover,DEHP concentrations in supernatant of treatments added root exu-dates at 15th day were higher than those at 30th day(except the treatment of DEHP 20 mg.L-1 of Teqing-60),implying that the effects of root exudates on DEHP desorption at early grow stage were higher than at late grow stage.Significant correlation(r≥0.924 9)was ob-served between DEHP concentrations in supernatant of treatments added two genotypes of Brassica parachinensis root exudates and DEHP contents in root and shoot.It was therefore concluded that higher desorption of DEHP in soil might be an important mechanism which resulted in significantly higher DEHP accumulation in Youqing-60 than in Teqing-60.
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Claims 6
Claim · model-written summary
Brassica root exudates raised supernatant DEHP concentration 1.9–26.6 times versus water.
- Taxon
- Brassica parachinensis
Brassica rapa var. parachinensist0 - Treatment
- root exudatese0
- Outcome
- DEHP concentrations in supernatante0
- Direction
- highere0
- Value
- 1.9~26.6 timese0
- Comparator
- distilled watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DEHP concentrations in supernatant of treatments added root exudates were higher than that added distilled water(1.9~26.6 times)”
t0“two genotypes of Brassica parachinensis,DEHP”
Claim · model-written summary
Higher hydroponic DEHP concentration increased the desorption effect of both genotypes’ exudates.
- Taxon
- Brassica parachinensisBrassica rapa var. parachinensise0
- Treatment
- increase of DEHP concentrations in hydroponic systemse0
- Outcome
- DEHP desorption in paddy soile0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the increase of DEHP concentrations in hydroponic systems,the effects of both two genotypes of Brassica parachinensis root exudates on DEHP desorption in paddy soil increased”
Claim · model-written summary
Youqing-60 exudates yielded 0.6–3.6 times higher supernatant DEHP than Teqing-60 exudates.
- Taxon
- Brassica parachinensisBrassica rapa var. parachinensist0
- Material
- Youqing-60e0
- Treatment
- Youqing-60 root exudatese0
- Outcome
- DEHP concentrations in supernatante0
- Direction
- highere0
- Value
- 0.6~3.6 timese0
- Comparator
- Teqing-60 root exudatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DEHP concentrations in supernatant of treatments added Youqing-60 root exudates were higher by 0.6~3.6 times than those added Teqing-60 root exudates”
t0“two genotypes of Brassica parachinensis,DEHP”
Claim · model-written summary
Day-15 exudates generally yielded higher supernatant DEHP than day-30 exudates, except Teqing-60 at 20 mg.L-1.
- Taxon
- Brassica parachinensisBrassica rapa var. parachinensist0
- Treatment
- root exu-dates at 15th daye0
- Outcome
- DEHP concentrations in supernatante0
- Direction
- highere0
- Qualifier
- except the treatment of DEHP 20 mg.L-1 of Teqing-60e0
- Comparator
- those at 30th daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DEHP concentrations in supernatant of treatments added root exu-dates at 15th day were higher than those at 30th day(except the treatment of DEHP 20 mg.L-1 of Teqing-60)”
t0“two genotypes of Brassica parachinensis,DEHP”
Claim · model-written summary
Supernatant DEHP correlated significantly with root and shoot DEHP content.
- Taxon
- Brassica parachinensisBrassica rapa var. parachinensise0
- Organ / stage
- root and shoote0
- Outcome
- DEHP contents in root and shoote0
- Value
- r≥0.924 9e0
- Comparator
- DEHP concentrations in supernatante0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant correlation(r≥0.924 9)was ob-served between DEHP concentrations in supernatant of treatments added two genotypes of Brassica parachinensis root exudates and DEHP contents in root and shoot”
Claim · model-written summary
Authors proposed enhanced soil DEHP desorption as a mechanism for higher accumulation in Youqing-60.
- Taxon
- Brassica parachinensisBrassica rapa var. parachinensist0
- Material
- Youqing-60e0
- Outcome
- DEHP accumulatione0
- Direction
- highere0
- Qualifier
- higher desorption of DEHP in soile0
- Comparator
- Teqing-60e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher desorption of DEHP in soil might be an important mechanism which resulted in significantly higher DEHP accumulation in Youqing-60 than in Teqing-60”
t0“two genotypes of Brassica parachinensis,DEHP”