[Salicylic acid can regulate phloem unload in a root tip]
2009
Burmistova, N.A. | Krasavina, M.S., Russian Academy of Sciences, Moscow (Russian Federation). The K.A. Timiryazev Institute of Plant Physiology | Akanov, Eh.N., The D.N. Pryanishnikov All-Russia Research and Development Inst. of Agrochemistry, Moscow (Russian Federation)
Endosperm, coleoptile with leaves and adventive roots were cut off from the 3-day maize seedlings (Zea mays L.). Primary roots were exposed in salicylic acid solutions (SA, 0-10E-3 mole) during 1-5 hours and fasciles were done in 2-deoxy –D-glucose solutions (2dG, 10E-2 M). 2dG-saccharose which had been synthesized on the base of 2dG, transported through phloem from the fasciles into the roots. The accumulation of 2dG-saccharose served as a measure of phloem unload in the root tips of 5 milli m. The SA in concentrations of more than 10E-4 M retarded the unload. In the same time sorbtion of sup14C-5.5-dimethyloxazolidine (DMO) that specified on cytoplasm oxidation. The SA of 10E-3 M also retarded breathing intensity and root growth. Lower SA concentrations (10E-5-10E-6 M) stimulated the unload in the conditions of light saccharose inflow. Their effects on DMO sorbtion, breathing and growth were not found. The SA in a concentration of 10E-4 M stimulated the unload during 1-2 hour exposition and did not effect in longer experiments. The conclusion was made that dependence between SA and its concentration and exposition has pointed on SA role in regulation of phloem unload in a root tip.
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