Gravitropism in cut flower stalks of snapdragon
| Autor: | Haya Friedman, R. Berkovitz-Simantov, Sonia Philosoph-Hadas, P. Balk, Peter B. Kaufman, Abraham H. Halevy, E. J. Woltering, Ida Rosenberger, Shimon Meir |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Atmospheric Science
Time Factors Gravitropism Aerospace Engineering chemistry.chemical_element Gene Expression Instituut voor Agrotechnologisch Onderzoek Calcium Stimulus (physiology) Genes Plant Antirrhinum majus Plant Growth Regulators Auxin Life Science Amyloplast Plastids Gravity Sensing Actin Cytoskeleton Chelating Agents chemistry.chemical_classification biology Indoleacetic Acids Plant Stems Herbicides Astronomy and Astrophysics Ethylenes biology.organism_classification Actin cytoskeleton Cold Temperature Geophysics chemistry Space and Planetary Science Agrotechnological Research Institute Biophysics General Earth and Planetary Sciences Plant Structures Scrophulariaceae Gravitation |
| Zdroj: | Advances in Space Research, 27, 5-932 Advances in Space Research 27 (2002) |
| ISSN: | 0273-1177 |
| Popis: | The negative gravitropic response of cut flower stalks is a complex multistep process that requires the participation of various cellular components acting in succession or in parallel. The process was particularly characterized in snapdragon (Antirrhinum majus L.) spikes with regard to (1) gravity stimulus perception associated with amyloplast reorientation; (2) stimulus transduction mediated through differential changes in the level, action and related genes of auxin and ethylene and their possible interaction; (3) stimulus response associated with differential growth leading to stalk curvature; (4) involvement of cytosolic calcium and actin cytoskeleton. Results show that the gravity-induced amyloplast reorientation, differential over-expression of two early auxin responsive genes and asymmetrical distribution of free IAA are early events in the bending process. These precede the asymmetrical ethylene production and differential stem growth, which was derived from initial shrinkage of the upper stem side and a subsequent elongation of the lower stem side. Results obtained with various calcium- and cytoskeleton-related agents indicate that cytosolic calcium and actin filaments may play essential roles in gravitropism-related processes of cut flower stalks. Therefore, modulators of these two physiological mediators may serve as means for controlling any undesired gravitropic bending. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect