| Abstrakt: |
To investigate the effect of nano-potassium silicate on the expression of glutamine (GLN) family gene, amino acid (AAs) componentand volatile metabolites (VMs) component of cucumber. With ordinary potassium silicate (OKSi) and nano-potassium silicate (NKSi) as different potassium fertilizer forms, the potassium levels (K2O) were set at 0 (CK), 150,300 and 450 kg·hm−2. Field experiment was conducted to study the effects of different forms of potassium fertilizers and potassium levels on content of amino acid components, species and contents of volatile substances in cucumbers, and on the expression of GLN family genes in cucumber fruits. The results indicated that the content of total amino acids was the highest in NKSi-300 and OKSi-450, and NKSi-300 brought greater increase of essential amino acids than OKSi-450. The content of volatile metabolites (VMs) under NKSi-450 treatment was highest. In NKSi treatment, GLN1.1, GLN1.2, GLN1.3 and GLN2 were upregulated, with the highest upregulation in NKSi-450, which was 8.28, 7.73, 9.26 and 5.62 times that of CK, respectively. Correlation analysis of cucumber GLN family gene expression and fruit amino acid and volatile metabolite components revealed that cucumber fruit GLN family gene expression and fruit glutamate (Glu) had a significant or extremely significant negative correlation with CsFGLN1.2, CsFGLN1.3 and CsFGLN2; in volatile metabolites, total alcohols had significant or extremely significant positive correlation with genes CsFGLN1.1 (r = 0.837*), CsFGLN1.2 (r = 0.936**), CsFGLN1.3 (r = 0.916**) and CsFGLN2 (r = 0.998**). Nano-potassium fertilizer can better improve the activity of related enzymes (GS, GOGAT, etc.) in nitrogen metabolism than ordinary potassium fertilizer, thereby increasing the expression of GLN family genes. [ABSTRACT FROM AUTHOR] |
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