The effect of an arbuscular mycorrhizal fungus ‘‘AMF’’ (Glomus constrictum Trappe) on
growth, pigments, and phosphorous content of marigold (Tagetes erecta) plant grown under different
levels of drought stress was investigated. The applied drought stress levels reduced growth vigor
(i.e. plant height, shoot dry weight, flower diameter as well as its fresh and dry weights) of mycorrhizal
and non-mycorrhizal plant as compared to control plant (non-drought stressed plant). The
presence of mycorrhizal fungus, however, stimulated all growth parameters of the treated plant
comparing to non-mycorrhizal treated plant. The photosynthetic pigments (carotene in flowers
and chlorophylls a and b in leaves) were also stimulated by the mycorrhizal fungi of well-watered
as well as of water-stressed plants. The total pigments of mycorrhizal plants grown under wellwatered
conditions were higher than those of non-mycorrhizal ones by 60%. In most cases,
drought-stressed mycorrhizal plants were significantly better than those of the non-mycorrhizal
plants. So, the overall results suggest that mycorrhizal fungal colonization affects host plant positively
on growth, pigments, and phosphorous content, flower quality and thereby alleviates the
stress imposed by water with holding.
The effect of an arbuscular mycorrhizal fungus ‘‘AMF’’ (Glomus constrictum Trappe) on
growth, pigments, and phosphorous content of marigold (Tagetes erecta) plant grown under different
levels of drought stress was investigated. The applied drought stress levels reduced growth vigor
(i.e. plant height, shoot dry weight, flower diameter as well as its fresh and dry weights) of mycorrhizal
and non-mycorrhizal plant as compared to control plant (non-drought stressed plant). The
presence of mycorrhizal fungus, however, stimulated all growth parameters of the treated plant
comparing to non-mycorrhizal treated plant. The photosynthetic pigments (carotene in flowers
and chlorophylls a and b in leaves) were also stimulated by the mycorrhizal fungi of well-watered
as well as of water-stressed plants. The total pigments of mycorrhizal plants grown under wellwatered
conditions were higher than those of non-mycorrhizal ones by 60%. In most cases,
drought-stressed mycorrhizal plants were significantly better than those of the non-mycorrhizal
plants. So, the overall results suggest that mycorrhizal fungal colonization affects host plant positively
on growth, pigments, and phosphorous content, flower quality and thereby alleviates the
stress imposed by water with holding.
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