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KMID : 0903619780190010035
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Journal of the Korean Society for Horticultural Science
1978 Volume.19 No. 1 p.35 ~ p.40
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A Study on the Absorption of Water and Cations in Two Pear Rootstocks , Pyrus betulaefolia B. Resistant to and Pyrus serotina R. Susccptible to Physiological Disorder " Yubu Fruit Phenomenon ")
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변재균/Byun, Jae Kyun
전변현이/임진이/평전상미/Tanabe, Kenji/Hayashi, Shinji/Hirata, Naomi
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Abstract
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In order to study the $quot;Yubu Fruit Phenomenon$quot;, a physiological disorder mainly occurred in ´Isipseki´ pear cultivar, it was grafted on the Pyrus betulaefolia, a resistant rootstock and on the P. serotina, a non-resistant rootstock and the physiological activities of two rootstock were compared. The grafted plant were grown for 3 years in pot and xylem sap was collected and the Ca, Mg, and K content in the sap was determined. The amount of the sap, the difference of the salts absorption according to the soil types and rootstocks, and response differences of rootstocks by drought condition were studied along with the morphology of the xylem elements.
The results are as follows.
(1) The P. betulaefolia rootstock produced more xylem sap and absorbed more Ca, Mg, and K than the P. serotina. This difference became pronounced during the early growing season as compared to the later season.
(2) The ration of Ca/K and Ca/Mg was higher with P. betulaefolia. However, no consistant Mg/K ratio was obtained.
(3) The difference of absorption ability of the rootstock became greater in the volcanic soil as compared to the sand. In volcanic soil, P. butulaefolia absorbed Ca, Mg, and K better than P. serotina rootstock.
(4) Although drought treatment reduced the xylem sap and the the Ca, Mg, and K absorption, no difference by the rootstocks were noticed.
(5) The diameter of vessel element in the 2.5㎜ diameter roots of relatively differenciated xylem was greater in P. betulaefolia than in P. serotina.
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