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To investigate the effects of exogenous spermidine (Spd) on metabolism changes under salt stress in cucumber roots, a gas chromatography-mass spectrometry (GC-MS) was performed. The results showed that most of the 142 metabolites responded to salt stress or exogenous Spd treatment. Salt stress reduced carbon consumption, resulted in the transformation of glycolysis and the tricarboxylic acid (TCA) cycle to the pentose phosphate pathway (PPP), and meanwhile increased salicylic acid (SA) and ethylene synthesis, and, thus, inhibited the growth of seedlings. However, exogenous Spd further improved the utilization of carbon, the energy-saving pattern of amino acid accumulation, and the control of hydroxyl radicals. In conclusion, Spd could promote energy metabolism and inhibit SA and ethylene synthesis in favor of root growth that contributes to higher salt tolerance. This study provides insight that may facilitate a better understanding of the salt resistance by Spd in cucumber seedlings.

The complete mitochondrial of genome Melanophila acuminata (DeGeer 1774) is a typical doublestranded circular molecule of 15,853 bp (GenBank accession number: MW287594). All tRNA genes, ranging from 62 to 72 bp, can be folded into typical cloverleaf secondary structure except for tRNA Ser(AGN). The control region is 1,080 bp long with an AþT content of 87.5%. The phylogeny tree is monophyletic among 19 related species. The Melanophila acuminata cluster was more closely related to Chrysochroa fulgidissima. This mitochondrial genome can be used for further analyses of Buprestidae mitochondrial comparative genomics to improve the understanding of diverse coleopteran species.

The pig body was put in the wild area in summer for collecting sarcosaphagous insects. After 31-day (9 June 2015 to 9 July 2015), the pig body was to be mummification. Ptecticus aurifer (Walker 1854) was found as sarcosaphagous insect for the first time. The complete mitochondrial genome of P. aurifer (Walker 1854) was sequenced in this study. The complete mitochondrial genome is a typical doublestranded circular molecule of 15,775 bp (GenBank accession number: MN604259) containing 37 typical animal mitochondrial gene and an A þ T-rich region. 11 of the 22 tRNAs, ranging from 63 to 72 bp, can be folded into classic clover-leaf secondary structure except for tRNA Ser(AGN) , in which the dihydrouridine (DHU) arm did not form a stable stem-loop structure. The control region is 954 bp long with an A þ T content of 90.7%. ARTICLE HISTORY

The mitochondrial genomes have the potential to be 'molecular clock' due to its high mutation rate and low DNA recombination rate. Here, we sequenced the complete mitochondrial genome of three strains of Calonectria ilicicola (anamorph Cylindrocladium parasiticum) isolated from diseased peanut showing symptoms of Cylindrocladium black rot (CBR) and two C. ilicicola strains isolated from diseased soybean showing symptoms of Red crown rot (RCR). The complete mitogenome of C. ilicicola ranged from 41,187 bp to 64,421 bp in length, 22-34 protein-coding genes, 19-20 tRNA genes, 2 rRNA genes, and a control region. Besides, we used a phylogenomic approach to infer evolutionary relationships among 591 mitochondrial genomes that span the diversity of 294 fungal species, including C. ilicicola. Our results underline the potential importance of mitochondrial genomes in comparative genomic analyses and provide a robust evolutionary insight across the tree of life.

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