1987 Fiscal Year Final Research Report Summary
Ecological genetic studies of Quercus ( in Hokkaido )
| Project/Area Number |
60304031
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | Kyushu University |
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Principal Investigator |
MIYAZAKI Yasusada Kyushu University . Prof., 農学部, 教授 (40038336)
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| Co-Investigator(Kenkyū-buntansha) |
KADOMATSU Masahiko Hokkaido University . Ass., 農学部, 助手 (60158847)
MATSUDA Kyo Hokkaido University . Lect., 農学部, 講師 (30002075)
KURAHASHI Akio Tokyo University . Lect., 農学部, 講師 (80012087)
INOUE Susumu Kyushu University . Ass. Prof., 農学部, 助教授 (20038342)
IGARASHI Tsuneo Hokkaido University . Prof., 農学部, 教授 (80001501)
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| Project Period (FY) |
1985 – 1987
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| Keywords | provenance test / oaks / hybridization / repeatability / acorn / cupule / 遺伝子浸透 / ウドンコ病 |
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| Research Abstract |
A provenance test scheme has been initiated since 1985 on 3 places located in the Kyushu University Forest in Hokkaido, the College Experiment Forest of Hokkaido University in Uryu, and the Tokyo University Forest in Hokkaido for oak tree species growing in Hokkaido. The oaks included not only 4 tree species of MIZUNARA(Quercus crispula), MONGORI-NARA(Q. mongolica), KASHIWA(Q. dentata) and KONARA(Q. serrata) but also their hybrids occured naturally among them. The materials used for the test were collected from 341 mother trees from 23 natural oak forests distributed in 3 districts in Hokkaido.
Repeatabilities of 13 characters on leaves, acorns and cupules of oaks were calculated for the purpose of finding genetically more reliable characters. Amongst them, repeatabilities of petiole ratio, serrata number of a leaf, length and width ratio of an acorn, and height and width ratio of a cupule indicated relatively heigher values of 0.43, 0.42, 0.45 and 0.40 respectively. The frequency analysis of the above mentioned characters suggested the existance of considerablly heigh variability within oak forests.
The component tree species within a oak population was analysed by means of comparing with the hair types beneath leaf. The analysis suggested that only 3 out of 34 oak populations might be composed of a single tree species on the one hand, remains might be complex populations of various kinds of oaks due to the introgressive spontaneous hybridization much or less.
Pathogenic studies were carried out with special emphasis on 4 kinds of root diseases, 13 kinds of trunk diseases, and 27 kinds of leaf diseases which were known as oaks' pathogens in Hokkaido. But the occurrence of these diseases were very rare during the period. The selection of tolerant individuals toward these pathogens would be expected under more suitable conditions for them.
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