Abstract
In order to clarify biochemical natures of the resistance on the chestnuts tree to chestnut gall wasp, polyphenolic substances were estimated as compared with the resistant wild Japanese chestnuts and the susceptible ones. Furthermore, contents in the barks of both current year shoots were determined every month. The results obtained were summarized as follows:1) In wild Japanese chestnuts similarly in the cultural varieties, catechol tannins and leucoanthocyanidins are abundant, but pyrogallol tannins are a little in the resistant varieties.2) Total tannins decrease accordnig to ageing and the amount of decrease from June to August in the resistant trees are less than of the susceptible.3) Catechol tannins are poor within the current year shoots are young, but increase their content with maturing the tissues, and trend are most remarkable increase during the period from middle or late June to early August, that is, from before the laying eggs of chestnut gall wasp through the period of hatching to the gall formation. The resistant varieties contain more catechol tannins every time than the susceptible ones, and are more active in biosynthesis.4) As for leucoanthocyanidins, the same inclination with catechol tannins was observed.5) Pyrogallol tannins contain more in the susceptible trees and in immature tissues, and decrease seasonaly, and their decrement is greater in the resistant.
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Claims 7
Claim · model-written summary
Resistant wild Japanese chestnuts had abundant catechol tannins and leucoanthocyanidins but little pyrogallol tannins.
Verbatim
t0“chestnuts tree”
e0“In wild Japanese chestnuts similarly in the cultural varieties, catechol tannins and leucoanthocyanidins are abundant, but pyrogallol tannins are a little in the resistant varieties”
Claim · model-written summary
Total tannins declined with age, with a smaller June to August decrease in resistant than susceptible trees.
Verbatim
t0“chestnuts tree”
e0“Total tannins decrease accordnig to ageing and the amount of decrease from June to August in the resistant trees are less than of the susceptible”
Claim · model-written summary
Catechol tannin content increased as current-year shoots matured, particularly from late June to early August.
Verbatim
t0“chestnuts tree”
e0“Catechol tannins are poor within the current year shoots are young, but increase their content with maturing the tissues, and trend are most remarkable increase during the period from middle or late June to early August”
Claim · model-written summary
Resistant varieties contained more catechol tannins than susceptible varieties at every sampling time.
Verbatim
t0“chestnuts tree”
e0“The resistant varieties contain more catechol tannins every time than the susceptible ones”
Claim · model-written summary
Catechol tannin biosynthesis was more active in resistant varieties.
Verbatim
t0“chestnuts tree”
e0“The resistant varieties contain more catechol tannins every time than the susceptible ones, and are more active in biosynthesis”
Claim · model-written summary
Leucoanthocyanidins followed the same trend as catechol tannins.
Verbatim
t0“chestnuts tree”
e0“As for leucoanthocyanidins, the same inclination with catechol tannins was observed”
Claim · model-written summary
Pyrogallol tannins were more abundant in susceptible trees and immature tissue and declined seasonally, more in resistant trees.
Verbatim
t0“chestnuts tree”
e0“Pyrogallol tannins contain more in the susceptible trees and in immature tissues, and decrease seasonaly, and their decrement is greater in the resistant”