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Auxin positively regulates nitrogen remobilization in cucumber leaves
Yalin Du,Lianxue Fan,Chunyu Tian,Tao Wu 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.2
Nitrogen (N) remobilization is an important N metabolic process in plants. The objective of this study was to increase our understanding of the relationship between low N tolerance and N remobilization in cucumber. Two cucumber cultivars, namely D0328 and D0422, were included in the analyses, the former of which displays a stronger capacity for low N tolerance. Source leaf transcriptomes were analyzed, which revealed differentially expressed genes in a number of interesting pathways, including amino acid biosynthesis, tyrosine and tryptophan biosynthesis, plant hormone signal transduction, and E3 ligase activity, implying that these pathways are involved in low N tolerance in cucumber. In agreement with transcriptome data, old D0328 leaves had significantly higher tryptophan and indole-3-acetic acid contents than old D0422 leaves under low N conditions. N remobilization efficiency in old leaves was increased by naphthaleneacetic acid treatment, whereas it was repressed by antiauxins α-(p-chlorophenoxy) isobutyric acid treatment. Taken together, the results of this study demonstrate that auxin promotes N remobilization in cucumber leaves during the reproductive stage of plant development and this positive regulation is associated with low N tolerance in cucumber.
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Transcriptome Profile Analysis of Cadmium Tolerance in Chinese Flowering Cabbage
Jiewei Wang,Huiyuan Li,Dandan Zou,Jinfeng Zhao,Lianxue Fan,Tao Wu 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.1
Chinese flowering cabbage (Brassica parachinensis L.) is an important leafy vegetable crop that can accumulatehigh levels of cadmium (Cd) and can thus be easily contaminated by this heavy metal. In this study, we performedgenome-wide transcriptional profiling of Cd tolerance in Cd-tolerant cultivar ‘LB70’ using Solexa sequencing to identifygenes and pathways involved in Cd tolerance in Chinese flowering cabbage. Profiling analysis revealed numerous changesin gene expression in response to Cd treatment, including 1669 genes that were downregulated and 1404 genes that wereupregulated. Gene ontology analysis showed that these differentially expressed genes were mainly involved in binding,catalytic processes, metabolism, cellular processes, single-organism processes, biological regulation, localization, andstimulus responses. Several known important Cd tolerance-related genes, such as HMA3, HMA4, and Nramp1, werealso identified. Pathway analysis suggested that two potential novel pathways, namely, the viral carcinogenesis andParkinson’s disease pathways, might be involved in Cd tolerance in Chinese flowering cabbage. The genes andpathways identified in this study provide an important basis for future studies on the molecular mechanism of Cdtolerance in Chinese flowering cabbage.
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