Articles
Changes in root organic acid exudates of Malus hupehensis Rehd induced by leaching liquor of roots and soil from the update orchard
Article number
1261_17
Pages
99 – 108
Language
English
Abstract
Organic acids secreted by plants have an obvious effect on plants, microbial growth, and soil conditions.
Acids such as p-hydroxybenzoic acid, cinnamic acid, and benzoic acid can inhibit seed germination and root growth.
The effects of leaching liquor of roots and soil from an update orchard on seedling growth of Malus hupehensis Rehd were studied using sand culture.
Root exudates were collected, and the amounts and changes in the exudates were analyzed by HPLC after treatment with leaching liquor for 15, 30, 45, and 60 d.
The results were as follows: 1) Low concentration of leaching liquor from the root (A1) and leaching liquor from the soil (B1) significantly improved plant growth and chlorophyll synthesis; treatment with high concentrations (A6, B4-6) inhibited growth.
Allelopathy was the strongest in the exudate after 30 d of treatment.
All treatments with root leaching liquor and those with high concentrations of soil leaching liquor (B5, B6) inhibited stem diameter, with higher concentration causing stronger inhibition; the RI of A6 was 0.74 and the RI of A6 was 0.53 on average at 60 d. 2) Treatment A1 increased peroxidase (POD) and catalase (CAT) activity; A4 decreased POD activity; A4 and A5 decreased superoxide dismutase (SOD) activity; A4-6 decreased CAT activity.
Low concentrations of soil leaching liquor had no significant effect on POD, SOD, or CAT activity; B5 and B6 decreased POD, SOD, and CAT activity. 3) In all roots, soil leaching liquor treatment inhibited the secretion of gallic acid, hydroxybenzoic acid, benzoic acid, and phloridzin.
Secretion of other phenolic acids had different functions because of the different concentrations.
Acids such as p-hydroxybenzoic acid, cinnamic acid, and benzoic acid can inhibit seed germination and root growth.
The effects of leaching liquor of roots and soil from an update orchard on seedling growth of Malus hupehensis Rehd were studied using sand culture.
Root exudates were collected, and the amounts and changes in the exudates were analyzed by HPLC after treatment with leaching liquor for 15, 30, 45, and 60 d.
The results were as follows: 1) Low concentration of leaching liquor from the root (A1) and leaching liquor from the soil (B1) significantly improved plant growth and chlorophyll synthesis; treatment with high concentrations (A6, B4-6) inhibited growth.
Allelopathy was the strongest in the exudate after 30 d of treatment.
All treatments with root leaching liquor and those with high concentrations of soil leaching liquor (B5, B6) inhibited stem diameter, with higher concentration causing stronger inhibition; the RI of A6 was 0.74 and the RI of A6 was 0.53 on average at 60 d. 2) Treatment A1 increased peroxidase (POD) and catalase (CAT) activity; A4 decreased POD activity; A4 and A5 decreased superoxide dismutase (SOD) activity; A4-6 decreased CAT activity.
Low concentrations of soil leaching liquor had no significant effect on POD, SOD, or CAT activity; B5 and B6 decreased POD, SOD, and CAT activity. 3) In all roots, soil leaching liquor treatment inhibited the secretion of gallic acid, hydroxybenzoic acid, benzoic acid, and phloridzin.
Secretion of other phenolic acids had different functions because of the different concentrations.
Publication
Authors
Z.H. Wang, R. Wang, Z.Q. Mao, S.C. Wei, X. Shen
Keywords
update orchard, leaching liquor, root exudation, phenolic acid, Malus hupehensis Rehd
Groups involved
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