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Salinity's influence on boron toxicity in broccoli: II. Impacts on boron uptake, uptake mechanisms and tissue ion relations

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  • Smith, T.E.
  • Grattan, S.R.
  • Grieve, C.M.
  • Poss, J.A.
  • Suarez, D.L.

Abstract

Limited research has been conducted on the interactive effects of salinity and boron stresses on plants despite their common occurrence in natural systems. The purpose of this research was to determine and quantify the interactive effects of salinity, salt composition and boron on broccoli (Brassica oleracea L.) performance, particularly, element accumulation, ion interactions and boron uptake processes. A greenhouse experiment was conducted using a sand tank system where salinity-B treatment solutions were supplemented with a complete nutrient solution. Chloride-dominated salinity and salinity characteristic of California's San Joaquin valley (SJV), or sulfate-dominated, were tested at ECw (electrical conductivity of the irrigation water) levels of 2, 12 and 19 dS m-1. Each salinity treatment consisted of boron treatments of 0.5, 12 and 24 mg L-1. Salinity, regardless of salt composition, reduced shoot boron concentration at very high boron concentration (24 mg L-1). However, increased salinity increased shoot boron concentration when external boron concentration was low (0.5 mg L-1). Tissue Ca, Mg, Na, K, S and Cl concentrations were also affected by salinity level, chloride or sulfate salinity composition, and in some cases by substrate boron concentration. Calcium concentrations in shoots were greater for chloride-treated salinity as compared to SJV salinity-treated plants; magnesium concentrations trended opposite and were greater in those treated with SJV salinity. Chloride and sodium shoot concentrations both increased with salinity. Shoot chloride was greater with chloride substrate salinity and shoot sodium was greater with SJV substrate salinity. Using stable isotope analysis of solutions to separate transpiration from evapotranspiration (ET), we found that boron uptake and accumulation in the shoot was not simply the product of mass flow (solution concentration × cumulative transpiration), and the vast majority of the water lost from the tank system was by transpiration (>90%) regardless of treatment. Under low substrate boron, the levels of boron in broccoli shoots could be not accounted for by simple passive uptake and transport in the transpiration stream, which suggests that some energy-dependent process was also occurring. However, under high boron treatments, broccoli plants exhibited a mechanism that restricted boron uptake, transport and accumulation in the shoot.

Suggested Citation

  • Smith, T.E. & Grattan, S.R. & Grieve, C.M. & Poss, J.A. & Suarez, D.L., 2010. "Salinity's influence on boron toxicity in broccoli: II. Impacts on boron uptake, uptake mechanisms and tissue ion relations," Agricultural Water Management, Elsevier, vol. 97(6), pages 783-791, June.
  • Handle: RePEc:eee:agiwat:v:97:y:2010:i:6:p:783-791
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    References listed on IDEAS

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    1. Ferreyra, Raul E. & Aljaro, Agustin U. & Ruiz, Rafael Sch. & Rojas, Leonardo P. & Oster, J. D., 1997. "Behavior of 42 crop species grown in saline soils with high boron concentrations," Agricultural Water Management, Elsevier, vol. 34(2), pages 111-124, August.
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    Cited by:

    1. Sanogo, Soum & Ji, Pingsheng, 2013. "Water management in relation to control of Phytophthora capsici in vegetable crops," Agricultural Water Management, Elsevier, vol. 129(C), pages 113-119.

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