Excretion of proteins and carbohydrates, the number of root border cells (BC), and the effect of different concentrations of NaF (1, 5, 10, and 20 mM) on the growth rate of the roots were investigated in the seedlings of wheat (Triticum aestivum L.) with low (LGR) and high growth rate (HGR). At the early stage of growth (1 day), the rate of protein excretion to the medium was much greater in the LGR roots; as to carbohydrates, the difference between the LGR and HGR roots was less pronounced. When added to the germination medium, NaF suppressed root growth and induced excretion of high-molecular-weight proteins into the medium; this phenomenon was more pronounced in the HGR-roots. The number of BC did not depend on the rate of protein excretion into the medium. The population of BC was the same in the HGR and LGR roots. When 1 mM NaF was added to the medium, the number of BC in the rhizosphere equally increased in both HGR and LGR roots. The elevation of NaF concentration did not affect the number of BC.
Russian Journal of Plant Physiology – Springer Journals
Published: Jan 6, 2007
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