期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 196, 期 -, 页码 1055-1064出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2023.02.051
关键词
Wood biochar; Potassium nitrate; Root architecture; Sulfate assimilation; Sulfate distribution
The study found that the addition of potassium nitrate (KNO3) and wood biochar had a synergistic effect on improving root growth and sulfur (S) accumulation in apple trees. The addition of KNO3 increased enzyme activity and gene expression related to sulfate uptake and assimilation, and this effect was enhanced by wood biochar. Wood biochar alone also promoted enzyme activity and gene expression, and enhanced S distribution in roots. In the presence of wood biochar, KNO3 application decreased S distribution in roots but increased it in stems and leaves. Overall, wood biochar enhances the effect of KNO3 on S accumulation in apple trees.
To determine how potassium nitrate (KNO3) effect apple roots and sulfate assimilation in the presence of wood biochar in soil, KNO3 was applied to the root-zone soil without or with 150-day naturally aged wood biochar (1% w/w) in soil. Soil properties, root architecture, root activity, the accumulation and distribution of sulfur (S), enzyme activity, and gene expression related to sulfate uptake and assimilation in apple trees were analyzed. Results showed that KNO3 and wood biochar application exhibited synergistic effects on improving S accumulation and root growth. Meanwhile, KNO3 application increased the activities of ATPS, APR, SAT, OASTL and upregulated the expression of ATPS, APR, Sultr3;1, Sultr2;1, Sultr3;4, and Sultr3;5 in both roots and leaves, and the positive effects of KNO3 addition on both genes and enzyme activity were enhanced by wood biochar. Wood biochar amendment alone promoted the activities of enzymes described above, upregulated the expression of ATPS, APR, Sultr3;1, Sultr2;1, Sultr3;4, and Sultr4;2 in leaves, and enhanced S distribution in roots. KNO3 addition alone decreased S distribution in roots and increased that in stems. In the presence of wood biochar in soil, KNO3 application decreased S distribution in roots but increased that in both stems and leaves. These results indicated that the wood biochar in soil enhances the effect of KNO3 on S accumulation by promoting root growth and sulfate assimilation in apple trees.
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