ISHS Acta Horticulturae 636: XXVI International Horticultural Congress: Key Processes in the Growth and Cropping of Deciduous Fruit and Nut Trees
CHARACTERISTICS OF THE RESPIRATION CHAIN IN RELATION TO FLOODING TOLERANCE IN PEAR ROOTSTOCKS |
| Authors: | F. Tamura, K. Tanabe, A. Itai |
| Keywords: | flooding tolerance, rootstocks, Pyrus species, cyanide-insensitive respiration |
| Abstract:
Flooding tolerance of several pear rootstocks were estimated under experimental flooding conditions. Two strains of Pyrus calleryana (P. c), No. 6 and No. 8, were most tolerant to flooding. P. betulaefolia, strains U and N, and P. c, No. 4, No. 7 and No. 10 had medium tolerance to flooding. P. dimorphophylla, P. pyrifolia (P. p), P. pyrifolia x betulaefolia (P. p x b) and P. pyrifolia x calleryana were not tolerant to flooding. The effects of flooding on ethanol production, HCN evolution and cyanide-insensitive respiration of the flooding tolerant (P. c, No. 6 and No. 8) and intolerant (P. p and P. p x b) were studied. Ethanol content increased in the roots with no significant difference among the rootstocks during flooding treatment. The roots of the plants evolved the same level of HCN by flooding treatment. The level of cyanide-insensitive respiration of the roots was increased by flooding in P. c, No. 6 and No. 8, but not in P. p x b and P. p. No apparent change was detected in the density of mitochondrial particles (Fraction I) in roots of P. p x b and P. p by the flooding treatment. Conversely, the heavier mitochondrial particles (Fraction II) appeared in the roots of P. c, No. 6 and No. 8 by flooding. Fraction II was markedly insensitive to cyanide. | |
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