African Journal of
Biochemistry Research

  • Abbreviation: Afr. J. Biochem. Res.
  • Language: English
  • ISSN: 1996-0778
  • DOI: 10.5897/AJBR
  • Start Year: 2007
  • Published Articles: 366

Full Length Research Paper

Effect of pre-harvest chitosan foliar application on growth, yield and chemical composition of Washington navel orange trees grown in two different regions

Ahmed Hussien Hanafy Ahmed
  • Ahmed Hussien Hanafy Ahmed
  • Plant Physiology Section, Agricultural Botany Department, Faculty of Agriculture, Cairo University, Giza, Egypt.
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Mohamed Ramadan Aboul-Ella Nesiem
  • Mohamed Ramadan Aboul-Ella Nesiem
  • Plant Physiology Section, Agricultural Botany Department, Faculty of Agriculture, Cairo University, Giza, Egypt.
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Hesham Ali Allam
  • Hesham Ali Allam
  • Post-harvest Research Department, Horticultural Research Institute, Agricultural Research Center (A.R.C.), Giza, Egypt.
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Amira Fahmy El-Wakil
  • Amira Fahmy El-Wakil
  • Post-harvest Research Department, Horticultural Research Institute, Agricultural Research Center (A.R.C.), Giza, Egypt.
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  •  Received: 01 October 2016
  •  Accepted: 10 November 2016
  •  Published: 30 November 2016

Abstract

The present study was carried out during 2012 and 2013 seasons to study the effect of pre-harvest foliar application of chitosan (a natural beta-1-4-linked glucosamine polymer) at two concentrations 250 and 500 ppm on vegetative tree growth, fruit yield and quality as well as leaves chemical composition of Washington navel orange trees grown under two  locations. As for growth parameters (shoot length, leaves number, and leaves area), the results revealed that chitosan treatments had insignificant effect. Meanwhile, it had a significant improvement on most of the studied fruit characters and leaf chemical constituents, that is, pigments, sugars, total soluble phenols, total free amino acids, endogenous plant hormones “IAA, ABA and GA3” as well as leaf nutritional status “N, P, K, Zn, Ca, B and Si”. Generally, pre-harvest chitosan applications mostly had pronounced positive effects on improving navel orange quality, that is, fruit weight, firmness and T.S.S.%, especially at the rate 500 ppm.

Key words: Citrus, chitosan, growth characters, fruit quality, total chlorophyll, sugar, total soluble sugar (TSS).