The objective of this paper is to research the effects of CdCl2 treatment on mineral elements and amino acids in leaves of Malus hupehensis var. pingyiensis. The seedlings of Malus hupehensis var. pingyiensis with 6 l...The objective of this paper is to research the effects of CdCl2 treatment on mineral elements and amino acids in leaves of Malus hupehensis var. pingyiensis. The seedlings of Malus hupehensis var. pingyiensis with 6 leaf were cultured in 1/2 Hoagland nutrient solutions of different CdCl2 treatments (0, 0.5, 5 and 10 mg·L-1), respectively. The mineral elements and amino acids of the leaves in Malus hupehensis var. pingyiensis were measured in the day 30. Compared with the control (0 mg·L-1 CdCl2), the treatments significantly decreased the contents of Mg, Fe and Zn in the tested leaves and obviously increased the contents of Cd in the experimental leaves. As to Ca and Mn, low concentration Cd treatment (0.5 mg·L-1 CdCl2) promoted their absorption, however, high concentration Cd treatments (5 and 10 mg·L-1 CdCl2) inhibited their absorption. The metabolism pathway and content of amino acids in the Malus hupehensis var. pingyiensis leaves under Cd treatment were modified, the content of amino acids in the glycolate pathway became larger than that in control, the content of amino acids in the pyruvic acid synthesis pathway and tyrosine and phenylalanine became smaller than that in control, the content of other amino acids also had made a certain degree change. The results provided the important basis for safety production and quality evaluation of leaves in Malus hupehensis var. pingyiensis.展开更多
The purpose of this paper is to explore the effects of acid treatment on root morphology and architecture in seedlings of Malus hupehensis var. pingyiensis. The rootstock seedlings were cultured in 1/2 Hoagland nutrie...The purpose of this paper is to explore the effects of acid treatment on root morphology and architecture in seedlings of Malus hupehensis var. pingyiensis. The rootstock seedlings were cultured in 1/2 Hoagland nutrient solutions of different pH (pH 4, pH 4.5, pH 5 and pH 6), respectively. The parameters of root architecture were measured in the day 4, 8 and 12 with the professional WinRHIZO 2007. Compared with the control (pH 6), the treatments significantly decreased the fractal dimension, length, diameter, surface area and volume of roots in day 8 and 12, and they kept decreasing followed the increase of the acidity and treatment time. The growth of lateral roots was more susceptible to acid treatment than taproots. In addition, the acid treatment mainly inhibited the growth of rootlets, significantly decreased the proportion of rootlets that changed the composition of roots, and then simplified the space structure of roots.展开更多
One-year Malus hupehensis. var. pingyiensis seedlings potted in soil mixed with 10% or 40% organic fertilizer were treated with two concentrations of lignin (1.5 and 2.5 g·kg-1), and detected the effects of ligni...One-year Malus hupehensis. var. pingyiensis seedlings potted in soil mixed with 10% or 40% organic fertilizer were treated with two concentrations of lignin (1.5 and 2.5 g·kg-1), and detected the effects of lignin on root activity and soil nutrients in rhizosphere soil of Malus hupehensis. var. pingyiensis. (1) Lignin improved root activity of Malus hupehensis. var. pingyiensis, increased soil available nitrogen contents and soil organic matter contents. (2) Under 10% organic fertilizer, lignin improved soil available P and K contents. The root activity in Malus hupehensis. var. pingyiensis was the largest in 2.5 g·kg-1?lignin treatment. (3) Under 40% organic fertilizer, compared with the CK2 (the treatment of soil with organic fertilizer content 40%), lignin decreased the content of rhizosphere soil available K. 1.5 g·kg-1 lignin treatment had obviously increased the content of soil available P. The root activity was the largest in 2.5 g·kg-1 lignin treatment, while the content of rhizosphere soil available K lowered 8.5% compared with that of CK2 in the same treatment. Lignin changed the soil nutrients, 2.5 g·kg-1 lignin significantly improved root activity of Malus hupehensis. var. pingyiensis. The results provided a theoretical basis for the regulation of root activity and soil nutrients in Malus hupehensis. var. pingyiensis.展开更多
文摘The objective of this paper is to research the effects of CdCl2 treatment on mineral elements and amino acids in leaves of Malus hupehensis var. pingyiensis. The seedlings of Malus hupehensis var. pingyiensis with 6 leaf were cultured in 1/2 Hoagland nutrient solutions of different CdCl2 treatments (0, 0.5, 5 and 10 mg·L-1), respectively. The mineral elements and amino acids of the leaves in Malus hupehensis var. pingyiensis were measured in the day 30. Compared with the control (0 mg·L-1 CdCl2), the treatments significantly decreased the contents of Mg, Fe and Zn in the tested leaves and obviously increased the contents of Cd in the experimental leaves. As to Ca and Mn, low concentration Cd treatment (0.5 mg·L-1 CdCl2) promoted their absorption, however, high concentration Cd treatments (5 and 10 mg·L-1 CdCl2) inhibited their absorption. The metabolism pathway and content of amino acids in the Malus hupehensis var. pingyiensis leaves under Cd treatment were modified, the content of amino acids in the glycolate pathway became larger than that in control, the content of amino acids in the pyruvic acid synthesis pathway and tyrosine and phenylalanine became smaller than that in control, the content of other amino acids also had made a certain degree change. The results provided the important basis for safety production and quality evaluation of leaves in Malus hupehensis var. pingyiensis.
文摘The purpose of this paper is to explore the effects of acid treatment on root morphology and architecture in seedlings of Malus hupehensis var. pingyiensis. The rootstock seedlings were cultured in 1/2 Hoagland nutrient solutions of different pH (pH 4, pH 4.5, pH 5 and pH 6), respectively. The parameters of root architecture were measured in the day 4, 8 and 12 with the professional WinRHIZO 2007. Compared with the control (pH 6), the treatments significantly decreased the fractal dimension, length, diameter, surface area and volume of roots in day 8 and 12, and they kept decreasing followed the increase of the acidity and treatment time. The growth of lateral roots was more susceptible to acid treatment than taproots. In addition, the acid treatment mainly inhibited the growth of rootlets, significantly decreased the proportion of rootlets that changed the composition of roots, and then simplified the space structure of roots.
文摘One-year Malus hupehensis. var. pingyiensis seedlings potted in soil mixed with 10% or 40% organic fertilizer were treated with two concentrations of lignin (1.5 and 2.5 g·kg-1), and detected the effects of lignin on root activity and soil nutrients in rhizosphere soil of Malus hupehensis. var. pingyiensis. (1) Lignin improved root activity of Malus hupehensis. var. pingyiensis, increased soil available nitrogen contents and soil organic matter contents. (2) Under 10% organic fertilizer, lignin improved soil available P and K contents. The root activity in Malus hupehensis. var. pingyiensis was the largest in 2.5 g·kg-1?lignin treatment. (3) Under 40% organic fertilizer, compared with the CK2 (the treatment of soil with organic fertilizer content 40%), lignin decreased the content of rhizosphere soil available K. 1.5 g·kg-1 lignin treatment had obviously increased the content of soil available P. The root activity was the largest in 2.5 g·kg-1 lignin treatment, while the content of rhizosphere soil available K lowered 8.5% compared with that of CK2 in the same treatment. Lignin changed the soil nutrients, 2.5 g·kg-1 lignin significantly improved root activity of Malus hupehensis. var. pingyiensis. The results provided a theoretical basis for the regulation of root activity and soil nutrients in Malus hupehensis. var. pingyiensis.
