Universal Journal of Plant Science Vol. 4(2), pp. 11 - 21
DOI: 10.13189/ujps.2016.040201
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Allelopathic Potential of Eucalyptus rostrata Leaf Residue on Some Metabolic Activities of Zea mays L.


Hegab, M. M. 1,*, Gabr, M. A. 2, Al-Wakeel, S. A. M. 1, Hamed, B. A. 2
1 Department of Botany and Microbiology, Faculty of Science, Cairo University, Beni-Suef Branch, Egypt
2 Department of Botany, Faculty of Science, Cairo University, Egypt

ABSTRACT

A greenhouse pot experiment was conducted to investigate the possible allelopathic effect of Eucalyptus rostrata leaf residue on some metabolic activities associated with growth of 10, 20 and 30 – day – old corn plants. The lower level of Eucalyptus treatment (0.5 %, w/w) induced a stimulatory effect on the growth of shoot and root of corn plants. The positive effect was more obvious in shoot than in root growth. Inversely, high levels of incorporated Eucalyptus leaf residue (1 and 2 %, w/w) reduced all growth parameters of both shoot and root relative to the respective control, and this reduction was concentration dependent. The total phenolic aglycone content of mature Eucalyptus leaf was 16.89 mg g-1 dry weight present as water-soluble secondary metabolites. Qualitative and quantitative HPLC analysis of Eucalyptus rostrata leaves revealed the presence of nine phenolic compounds. The p-coumaric acid was the most dominant compound, while catechol and chlorogenic acid were detected in lesser amounts. A trace amount of salicylic acid, vanillin, coumarin, as well as caffeic, cinnamic and ferulic acids were also detected. The total phenolic content of corn shoot increased with the lower concentration of Eucalyptus residue and decreased with higher treatments. The lowest level of Eucalyptus residue (0.5%, w/w) increased the contents of photosynthetic pigments, particularly chlorophyll "a" content, which was correlated with increase in the total carbohydrate production. Similarly, the total nitrogen and total phosphorus, as well as nucleic acids were markedly higher than the control treatment. Negative pattern of changes in the contents of photosynthetic pigments, carbohydrate, nitrogen, phosphorus, phenolic compounds and nucleic acids, was observed in corn plant treated with high rates of Eucalyptus leaf residue (1 and 2%, w/w) as compared with their respective controls. These negative effects were concentration dependent.

KEYWORDS
Phenolic Compounds, Growth, Pigments and Metabolic Activities

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Hegab, M. M. , Gabr, M. A. , Al-Wakeel, S. A. M. , Hamed, B. A. , "Allelopathic Potential of Eucalyptus rostrata Leaf Residue on Some Metabolic Activities of Zea mays L.," Universal Journal of Plant Science, Vol. 4, No. 2, pp. 11 - 21, 2016. DOI: 10.13189/ujps.2016.040201.

(b). APA Format:
Hegab, M. M. , Gabr, M. A. , Al-Wakeel, S. A. M. , Hamed, B. A. (2016). Allelopathic Potential of Eucalyptus rostrata Leaf Residue on Some Metabolic Activities of Zea mays L.. Universal Journal of Plant Science, 4(2), 11 - 21. DOI: 10.13189/ujps.2016.040201.