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2015 | 37 | 04 |

Tytuł artykułu

Characteristics of Naplus uptake in sugar beet (Beta vulgaris L.) seedlings under mild salt conditions

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
Salinity is one of the major environmental factors, which limits crop productivity worldwide. To investigate sodium (Na+) uptake pathways in sugar beet (Beta vulgaris L.) under mild salt conditions, in the present work, Na+ and potassium (K+) accumulation, Na+/K+ ratio, and Na+ and K+ net uptake rate in plants exposed to various concentrations of NaCl (0–50 mM) were analyzed in the absence or presence of KCl (10 and 50 mM) and K+ channel inhibitors Tetraethylammonium-Cl (TEA+, 5 and 10 mM), CsCl (Cs+, 3 and 6 mM) and BaCl2 (Ba2+, 5 and 10 mM). The results showed that high concentration (50 mM) of KCl significantly reduced Na+/K+ ratios in shoot and root of sugar beet in the absence or presence of NaCl. 10 or 50 mM KCl also decreased Na+ net uptake rate, or had no effects on it at 5, 10, and 50 mM NaCl, while enhanced K+ net uptake rate with external NaCl concentration at 5 and 25 mM. It seemed that high external K+ levels could maintain lower Na+/K+ ratio in sugar beet by enhancing K+ uptake and restricting Na+ uptake. Both 5 and 10 mM TEA+, which are considered to be a blocker of K+ channels, had no significant effects on net uptake rates of Na+ and K+ in sugar beet in the absence or presence of NaCl. However, 3 or 6 mM Cs+, which is also known to be an inhibitor of the K+ inward-rectifying channel (AKT1), led to significant reduction of K+ net uptake rate but did not affect Na+ net uptake rate in the presence of NaCl. 5 or 10 mM Ba2+, which is known as another blocker of K+ channel and transporter (HKT), not only reduced Na+ net uptake rate but also decreased K+ net uptake rate (except at 25 mM NaCl) in sugar beet at 5–50 mM NaCl. It is clear that Na+ uptake in sugar beet is very sensitive to Ba2+ but insensitive to TEA+ or Cs+, and that K+ uptake is sensitive to Cs+ or Ba2+, whereas it is insensitive to TEA+. We proposed that the AKT1 may mediate K+ uptake and HKT1 may mediate Na+ uptake in sugar beet at 5–50 mM NaCl.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

37

Numer

04

Opis fizyczny

Article: 70 [13 p.]. fig.,ref.

Twórcy

autor
  • School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
autor
  • School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
autor
  • Lanzhou Institute of Husbandry and Pharmaceutical Science, CAAS, Lanzhou730050, China
autor
  • State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730050, China
autor
  • School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
autor
  • School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
autor
  • School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China

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Typ dokumentu

Bibliografia

Identyfikatory

Identyfikator YADDA

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