Influence of organic manures on arbuscular mycorrhizal fungi associated with Vigna unguiculata (L.) Walp. in relation to tissue nutrients and soluble carbohydrate in roots under field conditions |
| |
| Authors: | T Muthukumar K Udaiyan |
| |
| Institution: | (1) Microbiology Laboratory, Department of Botany, Bharathiar University, Coimbatore-641 046, Tamil Nadu, India e-mail: botany@bharathi.ernet.in, IN |
| |
| Abstract: | The interaction of plant nutrients, root-soluble carbohydrate availability and arbuscular mycorrhizal (AM) fungi was examined
in field grown cowpea Vigna unguiculata (L.) Walp.]. Plant nutrients were altered through application of farmyard (cow dung, sheep manure) and green (sunnhemp, pongamia)
manures. Organic amendments increased plant growth, AM fungal colonization, soluble carbohydrate concentration in roots, and
spore numbers. Percent total colonization, root length with vesicles and spore numbers in soil were negatively correlated
with the concentration of soluble carbohydrates within roots, which in turn were related to tissue nutrient levels. However,
a positive correlation existed between soluble carbohydrate concentrations within root and root length with arbuscules. But
the mycorrhizal parameters were related more to plant nutrient level and their ratios, indicating that tissue nutrients have
another level of control in addition to their effect on soluble carbohydrate concentration in roots. Increased AM colonization
due to organic amendment significantly reduced nutrient imbalances. The strong relationship between colonization and root-soluble
carbohydrate concentration levels validates the basic assumption that mycorrhizal fungi act as a 'strong sink' for photosynthates.
This study indicates that the host influences AM colonization by regulating the formation of AM fungal structures and spore
formation via availability of root carbohydrates.
Received: 15 January 1999 |
| |
| Keywords: | Arbuscular mycorrhizal fungi Cowpea Organic manures Carbohydrates Arbuscules |
| 本文献已被 SpringerLink 等数据库收录！ |
|
