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THE EFFECT OF TEMPERATURE ON THE PERCENTAGE OF GERMINATION OF MUNG BEANS
Abstract
The experiments described were designed to investigate the way in which high temperatures (30°C and above) affected the survival and infectivity of spores of Glomus intraradices formulated as the commercial inoculum NutriLinkTM. Infection of mung bean (Vigna radiata) occurred most rapidly at 30°C compared with either 22° or 38°C, although the final percentage of the root length infected (6 weeks) was similar at all three temperatures. Early rapid infection led to greater plant growth of this species at 30°. In cashew (Anacardium occidentale) no infection occurred at 38°C and this was associated with low plant growth, compared with the other temperatures at which infection reached 40–60% after 4 months. In both species differences in root temperature were associated with marked differences in the morphology and growth of the root systems, with poor root growth at 38°C. Spores of G. intraradices retained infectivity with respect to mung bean for up to 6 weeks in moist fallow soil, although maximum infectivity was observed in soil without a fallow period. The effects of temperature on germination of spores buried in filter paper sandwiches in soil were consistent with the data for infection and growth. Germination was most rapid and reached the highest percentage at 3 weeks at 30°C. Lowest germination was attained at 38°C. We conclude that G. intraradices can retain its infectivity in moist soil at high temperatures, but that the extent to which the plants become infected and hence their response, depends not only on this but also on host factors such as root growth.
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