Resistance to auxinic herbicides is increasing in a range of dicotyledonous weed species, but in most cases the biochemical mechanism of resistance is unknown. Using (14)C-labelled herbicide, the mechanism of resistance to 2,4-dichlorophenoxyacetic acid (2,4-D) in two wild radish (Raphanus raphanistrum L.) populations was identified as an inability to translocate 2,4-D out of the treated leaf. Although 2,4-D was metabolized in wild radish, and in a different manner to the well-characterized crop species wheat and bean, there was no difference in metabolism between the susceptible and resistant populations. Reduced translocation of 2,4-D in the latter was also not due to sequestration of the herbicide, or to reduced uptake by the leaf epidermis or mesophyll cells. Application of auxin efflux or ABCB transporter inhibitors to 2,4-D-susceptible plants caused a mimicking of the reduced-translocation resistance phenotype, suggesting that 2,4-D resistance in the populations under investigation could be due to an alteration in the activity of a plasma membrane ABCB-type auxin transporter responsible for facilitating long-distance transport of 2,4-D.
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http://dx.doi.org/10.1093/jxb/erw120 | DOI Listing |
Plant Physiol Biochem
January 2025
College of Horticulture and Landscape Architecture, Southwest University, Beibei, Chongqing, 400715, China. Electronic address:
The plant UDP-glycosyltransferases (UGTs) regulate several metabolic processes during root growth and development by conjugating sugar moieties to various small molecules. RsUGT71B5 is a novel UDP-glycosyltransferase in Raphanus sativus L., but its biological function is not well established.
View Article and Find Full Text PDFSci Rep
December 2024
Faculty of Natural Science, Walter Sisulu University, Mthatha, South Africa.
Changing climates threaten crop growth and fodder yields in dryland farming. This study assessed two radish genotypes (LINE 2, ENDURANCE) under three water regimes (W1 = well-watered, W2 = moderate stress, W3 = severe stress) and two leaf harvesting options over two seasons (2021/22 and 2022/23). Key findings revealed that water regime significantly (P < 0.
View Article and Find Full Text PDFToxins (Basel)
December 2024
Hebei Key Laboratory of Crop Stress Biology, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China.
is the main pathogen of peanut pod rot in China. To investigate the type of toxin and its pathogenic mechanism, a macrolide, brefeldin A, was isolated. The structure of the compound was identified by 1D and 2D nuclear magnetic resonance (NMR) and high-resolution electrospray ionization-mass spectrometry (HR-ESI-MS).
View Article and Find Full Text PDFPlant Physiol Biochem
December 2024
Key Laboratory of Horticultural Crop Biology and Genetic Improvement (East China) of MOAR, College of Horticulture, Sanya Institute, Nanjing Agricultural University, Nanjing 210095, PR China. Electronic address:
Radish is an economically important root vegetable crop worldwide. Histone deacetylases (HDACs), one of the most important epigenetic regulators, play prominent roles in plant growth and development as well as abiotic stress responses. Nevertheless, the systematical characterization and critical roles of HDAC gene members in thermogenesis remains elusive in radish.
View Article and Find Full Text PDFCurr Res Food Sci
November 2024
Shandong Provincial Key Laboratory of Test Technology on Food Quality and Safety, Institute of Quality Standard and Testing Technology for Agro-Products, Shandong Academy of Agricultural Sciences, Jinan, 250100, China.
Radish is an important vegetable worldwide, with wide medicinal functions and health benefits. The quality of radish, strongly affected by phytochemicals like flavonoids and glucosinolates, are quite different depending on the radish varieties. However, the comprehensive accumulation profiles of secondary metabolites and their molecular regulatory mechanisms in different radish cultivars remain unclear thus far.
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