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引言农田灌溉是一种最易提高干旱地区农业产量的方法。灌溉农业与旱作农业相比,谷物产量可提高6倍,根块植物产量可提高4—5倍。因此,农田灌溉在渴望得到更多粮食的干旱地区,可以发挥巨大的作用。农田灌溉使这些地区获得高产稳产,同时减轻了干旱和沙漠化的威胁。 相似文献
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In this study, we integrated a DNA barcoding project with an ecological survey on intertidal polychaete communities and investigated
the utility of CO1 gene sequence as a DNA barcode for the classification of the intertidal polychaetes. Using 16S rDNA as
a complementary marker and combining morphological and ecological characterization, some of dominant and common polychaete
species from Chinese coasts were assessed for their taxonomic status. We obtained 22 haplotype gene sequences of 13 taxa,
including 10 CO1 sequences and 12 16S rDNA sequences. Based on intra- and inter-specific distances, we built phylogenetic
trees using the neighbor-joining method. Our study suggested that the mitochondrial CO1 gene was a valid DNA barcoding marker
for species identification in polychaetes, but other genes, such as 16S rDNA, could be used as a complementary genetic marker.
For more accurate species identification and effective testing of species hypothesis, DNA barcoding should be incorporated
with morphological, ecological, biogeographical, and phylogenetic information. The application of DNA barcoding and molecular
identification in the ecological survey on the intertidal polychaete communities demonstrated the feasibility of integrating
DNA taxonomy and ecology. 相似文献
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