Identification of Phloem Involved in Assimilate Loading in Leaves by the Activity of the Galactinol Synthase Promoter

Description:

Article discussing the identification of phloem involved in assimilate loading in leaves by the activity of the galactinol synthase promoter.

Creator(s):
Creation Date: July 2000
Partner(s):
UNT College of Arts and Sciences
Collection(s):
UNT Scholarly Works
Usage:
Total Uses: 168
Past 30 days: 15
Yesterday: 0
Creator (Author):
Haritatos, Edith Emily, 1969-

Cornell University

Creator (Author):
Ayre, Brian G.

University of North Texas; Cornell University

Creator (Author):
Turgeon, Robert

Cornell University

Publisher Info:
Place of Publication: [Rockville, Maryland]
Date(s):
  • Creation: July 2000
Description:

Article discussing the identification of phloem involved in assimilate loading in leaves by the activity of the galactinol synthase promoter.

Degree:
Department: Biological Sciences
Note:

Plant Physiology, July 2000, Vol. 123, pp. 929-937, www.plantphysiol.org; © American Society of Plant Physiologists

Note:

Abstract: The definition of "minor" veins in leaves is arbitrary and of uncertain biological significance. Generally, the term refers to the smallest vein classes in the leaf, believed to function in phloem loading. The authors found that a galactinol synthase promoter, cloned from melon (Cucumis melo), directs expression of the gusA gene to the smallest veins of mature Arabidopsis and cultivated tobacco (Nicotiana tabacum) leaves. This expression pattern is consistent with the role of galactinol synthase in sugar synthesis and phloem loading in cucurbits. The expression pattern in tobacco is especially noteworthy since galactinol is not synthesized in the leaves of this plant. Also, the authors unexpectedly found that expression in tobacco is limited to two of three companion cells in class-V veins, which are the most extensive in the leaf. Thus, the "minor" vein system is defined and regulated at the genetic level, and there is heterogeneity of response to this system by different companion cells of the same vein.

Physical Description:

9 p.

Language(s):
Subject(s):
Keyword(s): phloem | galactinol synthase
Source: Plant Physiology, 2000, Rockville: American Society of Plant Physiologists, pp. 929-937
Partner:
UNT College of Arts and Sciences
Collection:
UNT Scholarly Works
Identifier:
  • ARK: ark:/67531/metadc81381
Resource Type: Article
Format: Text
Rights:
Access: Public
Citation:
Publication Title: Plant Physiology
Volume: 123
Page Start: 929
Page End: 937
Pages: 9
Peer Reviewed: Yes