Interactive effects of salinity and macronutrient level on wheat. II. Composition

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

79 Zitate (Scopus)

Abstract

Results of several studies show interactive effects of salinity and macronutrients on the growth of wheat plants. These effects may be associated with the nutrient status in plant tissues. The objective of this study was to investigate interactive effects of salinity and macronutrients on mineral element concentrations in leaves, stems, and gram of spring wheat (Triticum aestivum L. cv. Lona), grown in hydroponics, and the relation of these effects to yield components. Eight salinity levels were established from 0 to 150 mM NaCl, and 1, 0.2, and 0.04 strength Hoagland macronutrient solution (x HS) were used as the macronutrient levels. Sodium (Na), potassium (K), calcium (Ca), magnesium (Mg), chlorine (Cl), and phosphorus (P) in leaves, stems, and grin, NO3 in leaves and stems, and total nitrogen (N) in grain were determined. Supplemental Ca, Mg, K, and NO3 added to 0.2 x HS increased mineral concentrations in leaves and stems, but did not improve growth or yield in salinized wheat plants except moderately at 100-150 mM NaCl. In contrast, growth or yield was improved significantly when the formed in these treatments, therefore, our results are inconclusive as to whether toxicity, nutrient imbalance, nutrient deficiency, or all of these factors had a strong influence on grain yield. Further work should focus on the relationship between plant growth and mineral concentration in early vegetative stages such as the tiller formation. We expect that these investigations will elucidate whether toxicity, nutrient imbalance, nutrient deficiency, or all of these factors limit grain yield in salinized wheat plants. In contrast, mineral concentrations measured at grain maturity at salinity levels higher than 120 ram NaCl with 1 and 0.2 x HS as well as with 0.04 x HS and >20 mM NaCl most likely reflect more than mere correlations to grain yield. In the latter case, increased Na concentrations and decreased Ca concentrations in the leaves, stems, and grain suggest that grain yield might be limited by Na/Ca disturbance, but not due to lowering the osmotic potential by increasing salinity.

OriginalspracheEnglisch
Seiten (von - bis)1169-1182
Seitenumfang14
FachzeitschriftJournal of Plant Nutrition
Jahrgang20
Ausgabenummer9
DOIs
PublikationsstatusVeröffentlicht - 1997
Extern publiziertJa

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