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  • Appearance of a pepper seedling at different stages of development (7, 10 and 14 d old). Three main organs are distinguishable after 10 d: radicle (embryonic root), hypocotyl (embryonic shoot) and green cotyledons.

    Regulation of ROS and RNS in pepper seedlings

    The development of seedlings involves many morphological, physiological and biochemical processes, which are controlled by many factors. Some reactive oxygen and nitrogen species (ROS and RNS, respectively) are implicated as signal molecules in physiological and phytopathological processes. Airaki et al. report the differential regulation of ROS and NO metabolism, and of NADP-dehydrogenases, in the different […] More

  • Inhibitors of NTR activity interfere with auxin response. Arabidopsis thaliana transgenic plants expressing the BA3 : : GUS and DR5 : : GUS genes were grown in ATS-agar for 4 d.

    Auxin, thioredoxin reductase, denitrosylation and root growth

    Auxin is the main phytohormone controlling root development in plants. Correa-Aragunde et al. grow seedlings of Arabidopsis thaliana treated with auxin with or without thioredoxin reductase (NTR) inhibitors and find that auxin and nitric oxide (NO) induce the activation of NADPH-dependent NTR, and that this activity is required for root growth responses. Auxin promotes protein […] More

  • Effect of exogenous NO gas on the ripening of pepper fruits. NO (5 p.p.m.) was either applied or not applied to fruits at an early breaking point stage for 1 h. Then, peppers were incubated at room temperature for 3 d.

    Ripening of pepper fruit and reactive nitrogen species

    Pepper (Capsicum annuum, Solanaceae) fruits are consumed worldwide and are of great economic importance. In most species ripening is characterized by important visual and metabolic changes, the latter including emission of volatile organic compounds associated with respiration, destruction of chlorophylls, synthesis of new pigments (red/yellow carotenoids plus xanthophylls and anthocyanins), formation of pectins and protein […] More