1994 Volume 63 Issue 3 Pages 619-628
Effects of vesicular-arbuscular mycorrhizal fungus (VAMF) inoculation on seedling growth in 17 species of vegetable crops were investigated, using two lines of VAMF (Glomus etunicatum and Glomus intraradices).
1. Growth was noticeably enhanced by VAMF inoculation to roots in Welsh onion, asparagus, pea, celery, and cucumber. The degree of growth enhancement varied with the host-fungus combination. VAMF inoculation caused both leaf sheaths and leaf blades to thicken in Welsh onion, and enhanced the formation of shoots and crowns in asparagus.
2. Fresh weights of shoot and root increased when the plants were inoculated with VAMF. In most vegetables, the increase in fresh weight of roots was caused by an increase of the number of roots, but in Welsh onion and asparagus, it was caused by an in- crease in the number of roots and a thickening of the main roots.
3. VAMF infection was recognized in most vegetables except petsai. A high infection level (rate of infected portion in a root system) was obtained mainly in plants with a large growth response to the fungus. In most vegetables except Welsh onion, VAMF infection was observed only in lateral roots ; the root caps were uninfected. Vesicules (symbiotic organ) developed in the roots of plants with a large growth response to the fungus.
4. Mycorrhizal dependency (ratio of total dry weight of 10 VAMF-inoculated plants to total dry weight of 10 non-inoculated plants) was maximum in Liliaceae (Welsh onion and asparagus) among 7 families with VAM fungus infection.