Effects of flooding on ethanol and ethylene production by pear [Pyrus sp.] rootstocks
1996
Tamura, F. (Tottori Univ. (Japan). Faculty of Agriculture) | Tanabe, K. | Katayama, M. | Itai, A.
Effects of water logging on ethanol and ethylene production by flood-tolerant pear rootstocks, Pyrus calleryana Decne, strains No.6 and No.8 and intolerant rootstocks, P. betulaefolia Bunge and P. pyrifolia Nakai were studied. Ethanol content and alcohol dehydrogenase (ADH) activity in the roots were measured under flooded condition. Ethanol content increased in the roots with no significant difference among the rootstocks, whereas ADH activity in P. calleryana, No.6 and No.8 was three times higher than that in P. betulaefolia and P. pyrifolia three days after the treatment. Roots of P. calleryana, No.6 and No.8 seemed to secrete ethanol into the incubation medium, whereas P. betulaefolia and P. pyrifolia did not. CO2 evolution from the fine roots was measured in 10 to 10,000 ppm of ethanol solution. There was a little difference among the rootstocks in respiratory tolerance to ethanol. Internal ethylene concentrations and 1-aminocyclopropane-1-carboxylic acid (ACC) content in the roots and leaves were measured during the flooding treatment. The rootstocks had similar patterns of ethylene and ACC fluctuations; they increased for 3 days after the treatments started then decreased gradually. Increase in ethylene concentration and ACC content in the leaves was observed after the treatment for 5 days; it occurred first in P. pyrifolia then detected in P. betulaefolia and two strains of P. calleryana in that order
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