Influence of Boron Nutrition on Membrane Leakage, Chlorophyll Content and Gas Exchange Characteristics in Cotton (Gossypium Hirsutum L.)

N. Ahmed, M. Abid, A. Rashid, R. Abou-Shanab, F. Ahmad

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Understanding the effect of boron (B) on plant physiology will help to refine the diagnosis of B deficiency and improvement in B fertilizer recommendations for cotton (Gossypium hirsutum L.) growing areas. This study shows the testing of hypotheses "that application of B-fertilizer improves net photosynthetic rate (PN) and water use efficiency (WUE) for cotton plant on a B-deficient soil [< 0.50 mg B kg-1 hydrochloric acid (HCl)-extractable] in an arid environment". Thus, a permanent layout [two-year field experiment (2004 and 2005)] was conducted to study the impact of B fertilizer at 0, 1.0, 1.5, 2.0, 2.5, and 3.0 kg ha-1 on gas exchange and electrolyte leakage (EL) characteristics of cotton crop (cv. 'CIM-473'). The soil at experimental site was alkaline (pH 8.1), calcareous [calcium carbonate (CaCO3 5.6%)], and silt loam (Typic Haplocambid). Boron use decreased EL of plant membrane (P ≤ 0.05), and increased PN, transpiration rate (E) and stomatal conductance (gs), while intercellular concentration of carbon dioxide (CO2; Ci) significantly decreased (P ≤ 0.05) during both experimental years. There was a positive, but non-significant effect of B concentration on chlorophyll content in plant leaves. Application of 3.0 kg B ha-1 improved WUE up to 9.7% [4.62 μmol (CO2) mmol-1 water (H2O)] compared to control plants (4.21 [μmol (CO2) mmol-1 (H2O)]. Principal component analysis (PCA) of data indicates positive correlations between leaf B concentration and PN, E, gs, and WUE, while a negative relationship existed between leaf B concentration and intercellular CO2 (Ci). This study showed that addition of B fertilizer in the B-deficient calcareous soil proved beneficial for growth and development for cotton crop by enhancing its WUE and gas exchange characteristics.

Original languageEnglish (US)
Pages (from-to)2302-2315
Number of pages14
JournalJournal of Plant Nutrition
Volume37
Issue number14
DOIs
StatePublished - Dec 2014

Keywords

  • Gossypium hirsutum L.
  • boron nutrition
  • calcareous soil
  • electrolyte leakage
  • photosynthetic rate
  • water use efficiency

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