Allelopathic effects of four Eucalyptus species on cowpea (Vigna unguiculata)

Sasikumar K., . and Vijayalakshmi C., . and Parthiban K. T., . Allelopathic effects of four Eucalyptus species on cowpea (Vigna unguiculata). pp. 419-428. ISSN 0128-1283

Allelopathic investigations into the leachates of bark fresh leaves and leaf litter of Eucalyptus tereticornis E. camaldullnsis E. poZvrarpa and E. microthera using paper and gas chromatography showed the presence ofcoumaric gallic gentisic hydroxybenzoic syringic and vanillic acids and catechol. The influence ofidentified phenolics as well as leachates on germination seedling length. dry maHer production vigour index and nitrogenase activity ofcowpea (CO.6) was investigated. Germination was inhibited in aU the cases except catechol and coumaric acid at 2 mM concentration. Vigour index was affected by catechol gallic and syringic acids. Bioassay with leachates revealed inhibition in germination in all the cases seven days after sowing. Dry matter production and vigour index were reduced by E. tereticoTnis E. carnaldulmsis and E. microthera. Seedling length was affected in all cases exceptE. tereticornis 37 days after sowing. Dry matter production was affected by E. tereticomis and E. ramaldulensis. Reduction in vigour index and nitrogenase activity was also noted in all cases compared with the control.

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Abstract

Allelopathic investigations into the leachates of bark fresh leaves and leaf litter of Eucalyptus tereticornis E. camaldullnsis E. poZvrarpa and E. microthera using paper and gas chromatography showed the presence ofcoumaric gallic gentisic hydroxybenzoic syringic and vanillic acids and catechol. The influence ofidentified phenolics as well as leachates on germination seedling length. dry maHer production vigour index and nitrogenase activity ofcowpea (CO.6) was investigated. Germination was inhibited in aU the cases except catechol and coumaric acid at 2 mM concentration. Vigour index was affected by catechol gallic and syringic acids. Bioassay with leachates revealed inhibition in germination in all the cases seven days after sowing. Dry matter production and vigour index were reduced by E. tereticoTnis E. carnaldulmsis and E. microthera. Seedling length was affected in all cases exceptE. tereticornis 37 days after sowing. Dry matter production was affected by E. tereticomis and E. ramaldulensis. Reduction in vigour index and nitrogenase activity was also noted in all cases compared with the control.

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Item Type:	Article
AGROVOC Term:	Eucalyptus
AGROVOC Term:	Cowpeas
AGROVOC Term:	Vigna unguiculata
AGROVOC Term:	Allelopathy
AGROVOC Term:	Leachates
AGROVOC Term:	Bark
AGROVOC Term:	Plant litter
AGROVOC Term:	Gas chromatography
AGROVOC Term:	Coumaric acids
AGROVOC Term:	Gallic acid
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/22235

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