Importancia da endomicorriza na nutricao mineral do cacaueiro
The importance of mycorrhiza for cacao was studied in pot experiments under unsterile and partially sterile soil conditions. Four species of vesicular arbuscular (VA) fungi were inoculated on the roots of two weeks old cacao seedlings. Sterilization by either autoclaving or fumigation with methyl bromide was detrimental to plant growth. Plants grown in sterile soil were stunted showing ondulating leaf margins resembling severe symptoms of zinc deficiency. Plants inoculated with Gigaspora margarita recovered after 15 weeks while control plants and those inoculated with other types of VA fungi did not recover, remaining stunted. Inoculation under non sterile conditions had no effect on plant growth. Sterilization reduced root infection by VA fungi and the effect of methyl bromide was more severe than autoclaving. G. margarita showed higher infection rates than all other species inoculated. Inoculation with Gigaspora heterogama reduced indigenous VA fungi infection. Zinc concentration on above-ground tissue as well as total zinc uptake were increased by inoculation with G. margarita. As for other nutrients, the observed differences in nutrient concentration resulted rather from sterilization than from inoculation with different VA fungi. In sterile soil, inoculation with G. margarita increased total nutrient uptake two fold relative to other VA especies
| Main Authors: | , |
|---|---|
| Format: | biblioteca |
| Published: |
1981
|
| Subjects: | THEOBROMA CACAO, MYCORRHIZAE, FLORA DEL SUELO, NUTRICION MINERAL, |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The importance of mycorrhiza for cacao was studied in pot experiments under unsterile and partially sterile soil conditions. Four species of vesicular arbuscular (VA) fungi were inoculated on the roots of two weeks old cacao seedlings. Sterilization by either autoclaving or fumigation with methyl bromide was detrimental to plant growth. Plants grown in sterile soil were stunted showing ondulating leaf margins resembling severe symptoms of zinc deficiency. Plants inoculated with Gigaspora margarita recovered after 15 weeks while control plants and those inoculated with other types of VA fungi did not recover, remaining stunted. Inoculation under non sterile conditions had no effect on plant growth. Sterilization reduced root infection by VA fungi and the effect of methyl bromide was more severe than autoclaving. G. margarita showed higher infection rates than all other species inoculated. Inoculation with Gigaspora heterogama reduced indigenous VA fungi infection. Zinc concentration on above-ground tissue as well as total zinc uptake were increased by inoculation with G. margarita. As for other nutrients, the observed differences in nutrient concentration resulted rather from sterilization than from inoculation with different VA fungi. In sterile soil, inoculation with G. margarita increased total nutrient uptake two fold relative to other VA especies |
|---|