Dependence of calcium uptake on water absorption and respiration in roots of tomato plants (Lycopersicon esculentum Mill.)

研究成果: ジャーナルへの寄稿記事

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Root xylem sap exuded from the decapitated stem stumps of tomato plants (Lycopersicon esculentum Mill.) was collected in the daytime and the nighttime, and dependence of calcium uptake on water absorption and respiration in the tomato roots is examined by analyzing exudation rate (JW; μLs-1), calcium concentration ([Ca2+]; mmol L-1) in the xylem sap and root calcium uptake rate (J(Ca); nmol s-1) in the root exudation. JW from the stem slump was about one third of transpiration rate from the whole shoot before decapitation and was kept two to five times higher in the daytime than in the nighttime. The xylem sap [Ca2+] was about 3 to 4.5 times higher than that of the nutrient solution in the hydroponic pot, and the xylem sap [Ca2+] in the daytime was 1.5 times higher than that in the nighttime. Consequently, J(Ca) in the daytime was 3 to 5.5 times higher than that in the nighttime. The daytime higher J(Ca) was depressed in the restrictedly water absorbing plant, and the restriction of root respiration in the daytime lowered the xylem sap [Ca2+], which resulted in significant depression in J(Ca). Furthermore, the lower J(Ca) in the nighttime was not enhanced by activating the nighttime root respiration. Thus, the daytime root calcium uptake was regulated by both of the water absorption and the respiration in roots, and the nighttime root respiration was not a rate-limiting factor for the lower calcium uptake in the nighttime. The observed dependence of calcium uptake on water absorption and respiration in roots was explained in relation to the important role of the root endodermis.

元の言語英語
ページ(範囲)121-130
ページ数10
ジャーナルBiotronics
28
出版物ステータス出版済み - 1999

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Plant Roots
Xylem
Lycopersicon esculentum
Solanum lycopersicum var. lycopersicum
water uptake
Respiration
respiration
calcium
tomatoes
Calcium
uptake mechanisms
Water
xylem
sap
water
Hydroponics
Decapitation
exudation
stem
decapitation

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences(all)
  • Plant Science
  • Environmental Science(all)

これを引用

@article{966760092dd9436d99729177f25657f5,
title = "Dependence of calcium uptake on water absorption and respiration in roots of tomato plants (Lycopersicon esculentum Mill.)",
abstract = "Root xylem sap exuded from the decapitated stem stumps of tomato plants (Lycopersicon esculentum Mill.) was collected in the daytime and the nighttime, and dependence of calcium uptake on water absorption and respiration in the tomato roots is examined by analyzing exudation rate (JW; μLs-1), calcium concentration ([Ca2+]; mmol L-1) in the xylem sap and root calcium uptake rate (J(Ca); nmol s-1) in the root exudation. JW from the stem slump was about one third of transpiration rate from the whole shoot before decapitation and was kept two to five times higher in the daytime than in the nighttime. The xylem sap [Ca2+] was about 3 to 4.5 times higher than that of the nutrient solution in the hydroponic pot, and the xylem sap [Ca2+] in the daytime was 1.5 times higher than that in the nighttime. Consequently, J(Ca) in the daytime was 3 to 5.5 times higher than that in the nighttime. The daytime higher J(Ca) was depressed in the restrictedly water absorbing plant, and the restriction of root respiration in the daytime lowered the xylem sap [Ca2+], which resulted in significant depression in J(Ca). Furthermore, the lower J(Ca) in the nighttime was not enhanced by activating the nighttime root respiration. Thus, the daytime root calcium uptake was regulated by both of the water absorption and the respiration in roots, and the nighttime root respiration was not a rate-limiting factor for the lower calcium uptake in the nighttime. The observed dependence of calcium uptake on water absorption and respiration in roots was explained in relation to the important role of the root endodermis.",
author = "Kitano Masaharu and T. Araki and Satoshi Yoshida and Toshihiko Eguchi",
year = "1999",
language = "English",
volume = "28",
pages = "121--130",
journal = "Biotronics",
issn = "0289-0011",
publisher = "Kyushu University, Faculty of Science",

}

TY - JOUR

T1 - Dependence of calcium uptake on water absorption and respiration in roots of tomato plants (Lycopersicon esculentum Mill.)

AU - Masaharu, Kitano

AU - Araki, T.

AU - Yoshida, Satoshi

AU - Eguchi, Toshihiko

PY - 1999

Y1 - 1999

N2 - Root xylem sap exuded from the decapitated stem stumps of tomato plants (Lycopersicon esculentum Mill.) was collected in the daytime and the nighttime, and dependence of calcium uptake on water absorption and respiration in the tomato roots is examined by analyzing exudation rate (JW; μLs-1), calcium concentration ([Ca2+]; mmol L-1) in the xylem sap and root calcium uptake rate (J(Ca); nmol s-1) in the root exudation. JW from the stem slump was about one third of transpiration rate from the whole shoot before decapitation and was kept two to five times higher in the daytime than in the nighttime. The xylem sap [Ca2+] was about 3 to 4.5 times higher than that of the nutrient solution in the hydroponic pot, and the xylem sap [Ca2+] in the daytime was 1.5 times higher than that in the nighttime. Consequently, J(Ca) in the daytime was 3 to 5.5 times higher than that in the nighttime. The daytime higher J(Ca) was depressed in the restrictedly water absorbing plant, and the restriction of root respiration in the daytime lowered the xylem sap [Ca2+], which resulted in significant depression in J(Ca). Furthermore, the lower J(Ca) in the nighttime was not enhanced by activating the nighttime root respiration. Thus, the daytime root calcium uptake was regulated by both of the water absorption and the respiration in roots, and the nighttime root respiration was not a rate-limiting factor for the lower calcium uptake in the nighttime. The observed dependence of calcium uptake on water absorption and respiration in roots was explained in relation to the important role of the root endodermis.

AB - Root xylem sap exuded from the decapitated stem stumps of tomato plants (Lycopersicon esculentum Mill.) was collected in the daytime and the nighttime, and dependence of calcium uptake on water absorption and respiration in the tomato roots is examined by analyzing exudation rate (JW; μLs-1), calcium concentration ([Ca2+]; mmol L-1) in the xylem sap and root calcium uptake rate (J(Ca); nmol s-1) in the root exudation. JW from the stem slump was about one third of transpiration rate from the whole shoot before decapitation and was kept two to five times higher in the daytime than in the nighttime. The xylem sap [Ca2+] was about 3 to 4.5 times higher than that of the nutrient solution in the hydroponic pot, and the xylem sap [Ca2+] in the daytime was 1.5 times higher than that in the nighttime. Consequently, J(Ca) in the daytime was 3 to 5.5 times higher than that in the nighttime. The daytime higher J(Ca) was depressed in the restrictedly water absorbing plant, and the restriction of root respiration in the daytime lowered the xylem sap [Ca2+], which resulted in significant depression in J(Ca). Furthermore, the lower J(Ca) in the nighttime was not enhanced by activating the nighttime root respiration. Thus, the daytime root calcium uptake was regulated by both of the water absorption and the respiration in roots, and the nighttime root respiration was not a rate-limiting factor for the lower calcium uptake in the nighttime. The observed dependence of calcium uptake on water absorption and respiration in roots was explained in relation to the important role of the root endodermis.

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VL - 28

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JO - Biotronics

JF - Biotronics

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