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https://hdl.handle.net/20.500.14094/90005376
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2024-04-19
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90005376 (fulltext)
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1.54 MB
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メタデータID
90005376
アクセス権
open access
出版タイプ
Accepted Manuscript
タイトル
Leaf water maintains daytime transpiration in young Cryptomeria japonica trees
著者
Himeno, Sawa ; Azuma, Wakana ; Gyokusen, Koichiro ; Ishii, Hiroaki
著者名
Himeno, Sawa
著者名
Azuma, Wakana
著者名
Gyokusen, Koichiro
著者ID
A1284
研究者ID
1000050346251
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=a835b4aff585cb5b520e17560c007669
著者名
Ishii, Hiroaki
石井, 弘明
イシイ, ヒロアキ
所属機関名
農学研究科
収録物名
Tree Physiology
巻(号)
37(10)
ページ
1394-1403
出版者
Oxford University Press
刊行日
2017-10-01
公開日
2018-11-20
注記
This is a pre-copyedited, author-produced version of an article accepted for publication in Tree Physiology following peer review. The version of record Sawa Himeno, Wakana Azuma, Koichiro Gyokusen, H Roaki Ishii; Leaf water maintains daytime transpiration in young Cryptomeria japonica trees, Tree Physiology, Volume 37, Issue 10, 1 October 2017, Pages 1394–1403 is available online at: https://doi.org/10.1093/treephys/tpx056
抄録
Compared with stem water storage, leaf water storage is understudied although it may be important for alleviating water stress by contributing quickly and directly to transpiration demand. To quantify the relative contribution of stem versus leaf water storage to daily water deficit, we measured diurnal changes in transpiration rate, sap-flow velocity and stem radius of 10-year-old Cryptomeria japonica D. Don trees. We assumed that the duration of time lags between transpiration rate and sap-flow velocity reflected stored water in the stem and leaf, and that stem volume change represented water content of elastic tissue. The relationship between fresh mass and water potential of the whole tree indicated that the study trees had capacity to store, on average, 91.4 ml of water per kg fresh mass at turgor loss. Leaves, sapwood and elastic tissue contributed around 51%, 29% and 20% of stored water, respectively. During morning, transpiration rates were higher than sap-flow velocity suggesting depletion of stored water. During the first 2 h after onset of transpiration, stored water contributed more than 100% of whole-tree transpiration. Depletion of leaf water (PLeaf) and sapwood water (PSap) coincided with the onset of transpiration and became maximum around 15:00 h. Depletion of elastic tissue water (PElastic) lagged behind that of PLeaf and PSap by 1–2 h, indicating that replenishment of stored water occurs late in the day when low leaf water potentials resulting from daytime transpiration drive water uptake. Maximum depletion of PLeaf was about 1–3 times and 5–10 times that of PSap and PElastic, respectively. The contribution of PLeaf to total daily transpiration was 5–8%, while those of PSap and PElastic were 3–4% and 0.7–1%, respectively. Our results suggest the importance of leaf water storage in maintaining daily transpiration in young C. japonica trees.
カテゴリ
農学研究科
学術雑誌論文
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資源タイプ
journal article
言語
English (英語)
ISSN
0829-318X
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eISSN
1758-4469
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NCID
AA10723688
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関連情報
DOI
https://doi.org/10.1093/treephys/tpx056
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