{"created":"2022-01-27T02:33:47.554435+00:00","id":2002625,"links":{},"metadata":{"_buckets":{"deposit":"950ae36b-b7aa-497b-b452-0e531c52b83e"},"_deposit":{"id":"2002625","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"2002625"},"status":"published"},"_oai":{"id":"oai:u-ryukyu.repo.nii.ac.jp:02002625","sets":["1642837622505:1642837905044:1642837922702","1642838403551:1642838407312"]},"author_link":[],"item_1617186331708":{"attribute_name":"Title","attribute_value_mlt":[{"subitem_1551255647225":"マヤプシキ(Sonneratia alba)の葉のガス交換特性とNa^+含量","subitem_1551255648112":"ja"},{"subitem_1551255647225":"Gas exchange characteristics and Na^+ content of the leaf in Sonneratia alba","subitem_1551255648112":"en"}]},"item_1617186419668":{"attribute_name":"Creator","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"川満, 芳信","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"吉原, 徹","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"川元, 知行","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"徳丸, 慶太郎","creatorNameLang":"ja"}]},{"creatorNames":[{"creatorName":"Kawamitsu, Yoshinobu","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Yoshihara, Toru","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Kawamoto, Tomoyuki","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"Tokumaru, Keitarou","creatorNameLang":"en"}]}]},"item_1617186476635":{"attribute_name":"Access Rights","attribute_value_mlt":[{"subitem_1522299639480":"open access","subitem_1600958577026":"http://purl.org/coar/access_right/c_abf2"}]},"item_1617186609386":{"attribute_name":"Subject","attribute_value_mlt":[{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"マングローブ"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"マヤプシキ"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"水ポテンシャル"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"気孔伝導度"},{"subitem_1522299896455":"ja","subitem_1522300014469":"Other","subitem_1523261968819":"ガス交換速度"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Gas exchange"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"A"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Ci curve"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Na content"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Mangrove"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Sonneratia alba"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Stomatal conductance"},{"subitem_1522299896455":"en","subitem_1522300014469":"Other","subitem_1523261968819":"Water potential"}]},"item_1617186626617":{"attribute_name":"Description","attribute_value_mlt":[{"subitem_description":"マングローブ樹種の中で塩分濃度の高い潮間帯地域に自生するマヤプシキを対象に,その著しく高い耐塩機構を解明するため,葉身のガス交換,水ポテンシャル,イオン・窒素吸収特性を調査した.次に,マヤプシキの幼齢木にNaCl処理を加え,光-光合成曲線とCO_2-光合成曲線を調べ,自然条件下の測定結果と比較しながらガス交換特性を種々検討した.1.マヤプシキの光合成速度は,他種と比較して著しく高く,20 μmol m^<-2>s^<-1>前後であった.また,光飽和点は,1500 μmol m^<-2>s^<-1>付近にあり,光合成最適温度は35℃付近にあった.2.マヤプシキのガス交換の日変化についてみると,光合成速度は,午前8時には最大値をとり,光強度が低下する午後6時まで一定に推移した.気孔伝導度及び蒸散速度は,正午に最大値を示し午後からは徐々に低下した.従って,1日の水利用効率は,午前と午後に高く蒸散速度の最大値を示す正午で低かった.葉内CO_2濃度は,日中ほぼ一定であり,CO_2固定系の活性が維持されていた.3.水ポテンシャルは,夜明け前の-0.8MPaから午後4時の-2.9MPaまで大きく低下しその後上昇した.しかし,水ポテンシャルの低下に伴う光合成の低下はみられず,葉のクロロブラスト内の浸透圧調節機構の充実度が高いことが予想された.4.マヤプシキの光合成速度をA/Ciカーブの初期勾配でみると,0mM及び400mM区よりも100mM区で高く,CO_2固定系が活性化されていることが認められた.しかし,CO_2濃度が350ppmの時の水利用効率は400mM区が最も高く,塩濃度が高い場合水を有効に利用していることが認められた.5.マヤプシキの根は,幼齢木の段階ですでに塩分排除機能を有しており,壮齢木,若齢木に比べて高い水ポテンシャル及び高い気孔伝導度及び蒸散速度を示した.マヤプシキ幼齢木の葉身には,壮齢木に比べ1.8倍のNa^+が含まれ,K^+は低く,K^+/Na^+比は低かった.マヤプシキの葉には浸透圧調節物質であるグリシンベタイン及びプロリンの蓄積は認められなかった.","subitem_description_type":"Other"},{"subitem_description":"The mangrove has a special salt filtration, thus salt tolerance mechanism. The photosynthate produced in the leaf is transferred to each organ and used for the salt tolerance process. In this report, we examined the gas exchange characteristics and Na^+ content of the leaf in Sonneratia alba, a high salt tolerance species. Sonneratia alba had the highest leaf photosynthetic rate as 20 μmol m^<-2>s^<-1>, Rhizophora stylosas=13 μmol m^<-2>s^<-1>, Bruguiera gymnorrhiza=8 μmol m^<-2>s^<-1>, Kandelia candel=15 μmol m^<-2>s^<-1>, Avicennia marina=13 μmol m^<-2>s^<-1>, Nypa fruticans=9.3 μmol m^<-2>s^<-1>, and Lumnitzera racemosa=9 μmol m^<-2>s^<-1>. Na^+ concentration in the leaf was higher in Avicenmia marina than other species due to the salt glands on the leaf.","subitem_description_type":"Other"},{"subitem_description":"紀要論文","subitem_description_type":"Other"}]},"item_1617186643794":{"attribute_name":"Publisher","attribute_value_mlt":[{"subitem_1522300295150":"ja","subitem_1522300316516":"琉球大学農学部"}]},"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/20.500.12000/3592"}]},"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":"琉球大学農学部学術報告"},{"subitem_1522650068558":"en","subitem_1522650091861":"The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus"}]},"item_1617187056579":{"attribute_name":"Bibliographic Information","attribute_value_mlt":[{"bibliographicIssueNumber":"50","bibliographicPageEnd":"33","bibliographicPageStart":"21"}]},"item_1617258105262":{"attribute_name":"Resource Type","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_1617265215918":{"attribute_name":"Version Type","attribute_value_mlt":[{"subitem_1522305645492":"VoR","subitem_1600292170262":"http://purl.org/coar/version/c_970fb48d4fbd8a85"}]},"item_1617605131499":{"attribute_name":"File","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","filename":"KJ00004258130.pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://u-ryukyu.repo.nii.ac.jp/record/2002625/files/KJ00004258130.pdf"},"version_id":"d87f7f6d-8b93-47e8-a37c-2e543c3c6dc6"}]},"item_title":"マヤプシキ(Sonneratia alba)の葉のガス交換特性とNa^+含量","item_type_id":"15","owner":"1","path":["1642837922702","1642838407312"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-02-14"},"publish_date":"2008-02-14","publish_status":"0","recid":"2002625","relation_version_is_last":true,"title":["マヤプシキ(Sonneratia alba)の葉のガス交換特性とNa^+含量"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-02-14T21:38:07.814361+00:00"}