{"created":"2022-01-27T02:45:41.148455+00:00","id":2003010,"links":{},"metadata":{"_buckets":{"deposit":"4bfc87a9-352c-4e46-93b5-aad304ac3990"},"_deposit":{"id":"2003010","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2003010"},"status":"published"},"_oai":{"id":"oai:u-ryukyu.repo.nii.ac.jp:02003010","sets":["1642837622505:1642837905044:1642837914150","1642838403551:1642838407312"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_1551255647225":"\u30de\u30c4\u5c5e\u306e\u751f\u9577\u306b\u304a\u3088\u307c\u3059\u65e5\u9577\u3068\u6c17\u6e29\u306e\u5f71\u97ff(\u9644\u5c5e\u6f14\u7fd2\u6797)","subitem_1551255648112":"ja"},{"subitem_1551255647225":"Effects of photoperiod and temperature on the vegetative growth in pine seedlings (Forestry Experiment 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thunbergii are naturally distributed from Honshu to Kyushu in Japan. In Okinawa, however, it is observed that the planted seedlings of these species do not grow well. This paper has tried to investigate a cause of their poor in Okinawa by means of the examination obtained through photoperiodic and temperature conditions. The vegetative growth of first-year seedlings of pine species becomes greater with longer photoperiod. The photoperiodic responses are some what different in the growth between the first-year and more than second-year seedlings. It has been reported that the photoperiodic treatment applied during the elongating period of main shoot hardly affected the growth in the second-year and older seedlings. However, the growth of Pinus densiflora and Pinus thunbergii is contiuously poor in Okinawa. In this paper the plants are therefore examined by the second-year and older seedlings. 1. The day length during the vegetative growth period in the northern hemisphere becomes longer as latitude increases upward from the vernal equinox on. Therefore, the photoperiodic treatment of vegetative growth of two pine species started from the Vernal Equinox Day. The result reveals that some increase on the shoot growth arises by continuous illumination (seedlings grown under natural day-length and the supplement illumination from sunset till sunrise). On the contrary, as to shoot growth, it appears, there is no notable difference between three treatments; that is, seedlings grown under natural day-length, seedlings grown under natural day-length and then the supplement illumination in two hours after sunset, and other seedlings grown under natural day-length and then the supplement illumination in two hours before sunrise. It is assumed that the seedlings completely begin to sprout before the vernal equinox and then the shoot has almost elongated before the photoperiodic treatment starts. 2. The following became clear after the preliminary investigation on vegetative growth of pine species.","subitem_description_type":"Other"},{"subitem_description":"The time of the beginning and cessation of the shoot growth is different between Okinawa and Kyoto, which is equivalent to the central area of the distributed range of Pinus densiflora and Pinus thunbergii. In Okinawa the shoot had begun and stopped growing about two months before in Kyoto. In Okinawa the shoot growth by day-length far less than 12 hours before vernal equinox starts. The difference of day-length is about an hour and a half during the vegetative growth period between Okinawa and Kyoto. Therefore, photoperiodic treatments are begun from the time of the beginning of the shoot growth and the experimental results between the two photoperiodic conditions are compared. The seedlings only grow under natural day light from sunrise to sunset (ND). Other seedlings grow under the same natural day light and then supplement illumination after sunset for two hours (LD). The LD treatment is under the condition close to the vegetative growth period of these species in Kyoto. 3. The vegetative growth, especially the elongation of main shoot and needles under ND treatment is remarkably less than those organs under the LD treatment. The above results abtained reveal the fact that apparently the effect of photoperiodic treatment of the vegetative growth is also recognized in the case of second-year seedlings, and the growth of Pinus densiflora and Pinus thunbergii grown in Okinawa is evidently suppressed by natural day-length which is one of all environmental factors. But the photoperiodic treatment has less effect on Pinus thunbergii than on Pinus densiflora. 4. The following year it is investigated under the same conditions continuously on the effect of photoperiodic treatment of third-year seedlings which have been used in previous experiment. The results show approximately the same as that obtained from the second-year seedlings. These pine species of poor growth in Okinawa are considered to be influenced by short-day d","subitem_description_type":"Other"},{"subitem_description":"\u7d00\u8981\u8ad6\u6587","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_1522300295150":"ja","subitem_1522300316516":"\u7409\u7403\u5927\u5b66\u8fb2\u5b66\u90e8"}]},"item_1617186702042":{"attribute_name":"Language","attribute_value_mlt":[{"subitem_1551255818386":"jpn"}]},"item_1617186783814":{"attribute_name":"Identifier","attribute_value_mlt":[{"subitem_identifier_type":"HDL","subitem_identifier_uri":"http://hdl.handle.net/20.500.12000/3981"}]},"item_1617186920753":{"attribute_name":"Source Identifier","attribute_value_mlt":[{"subitem_1522646500366":"ISSN","subitem_1522646572813":"0370-4246"},{"subitem_1522646500366":"NCID","subitem_1522646572813":"AN00250548"}]},"item_1617186941041":{"attribute_name":"Source Title","attribute_value_mlt":[{"subitem_1522650068558":"ja","subitem_1522650091861":"\u7409\u7403\u5927\u5b66\u8fb2\u5b66\u90e8\u5b66\u8853\u5831\u544a"},{"subitem_1522650068558":"en","subitem_1522650091861":"The Science Bulletin of the Faculty of Agriculture. 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