Regulation of Vacuolar pH in Citrus limon

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The primary objective of this grant was to characterize the vacuolar V-ATPase of lemon fruits. Lemon fruit vacuoles have an internal pH of about 2.5. Since a typical plant vacuole has a luminal pH of around 5.5, the lemon fruit V-APTase must have special properties which allow it to acidify the lumen to such a low pH: (1) it might have a different structure; (2) it might have a different H{sup +}/ATP stoichiometry; and (3) it might be regulated differently. During the course of the investigations (which began in 1996) they characterized these aspects of the V-ATPases of both lemon ... continued below

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Taiz, Lincoln June 22, 2005.

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Description

The primary objective of this grant was to characterize the vacuolar V-ATPase of lemon fruits. Lemon fruit vacuoles have an internal pH of about 2.5. Since a typical plant vacuole has a luminal pH of around 5.5, the lemon fruit V-APTase must have special properties which allow it to acidify the lumen to such a low pH: (1) it might have a different structure; (2) it might have a different H{sup +}/ATP stoichiometry; and (3) it might be regulated differently. During the course of the investigations (which began in 1996) they characterized these aspects of the V-ATPases of both lemon fruits and lime fruits. They examined lime fruits because of the availability of both acidic limes with a low vacuolar pH and sweet limes, which have a much higher vacuolar pH. The existence of two types of lime fruits allowed a comparison of the V-ATPases of the two varieties. In this report they are including two publications from 1996 and 1997 as background for the later publications. A review article with Heven Sze on V-ATPase nomenclature was also generated during the funding period. In addition to the studies on citrus fruit vacuoles, they also initiated studies in two new areas: polar auxin transport and the regulation of stomatal opening by UV-B irradiation. These studies were intended to serve as a basis of future separate grants, but the proposals they submitted on these topics were not funded.

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  • Report No.: NONE
  • Grant Number: FG03-84ER13245
  • DOI: 10.2172/841076 | External Link
  • Office of Scientific & Technical Information Report Number: 841076
  • Archival Resource Key: ark:/67531/metadc787026

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 22, 2005

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 17, 2018, 5:13 p.m.

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Taiz, Lincoln. Regulation of Vacuolar pH in Citrus limon, report, June 22, 2005; United States. (digital.library.unt.edu/ark:/67531/metadc787026/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.