Login
Registrati
Reimposta password
Pubblica & Distribuisci
Soluzioni Editoriali
Soluzioni di Distribuzione
Temi
Architettura e design
Arti
Business e Economia
Chimica
Chimica industriale
Farmacia
Filosofia
Fisica
Geoscienze
Ingegneria
Interesse generale
Legge
Letteratura
Linguistica e semiotica
Matematica
Medicina
Musica
Scienze bibliotecarie e dell'informazione, studi library
Scienze dei materiali
Scienze della vita
Scienze informatiche
Scienze sociali
Sport e tempo libero
Storia
Studi classici e del Vicino Oriente antico
Studi culturali
Studi ebraici
Teologia e religione
Pubblicazioni
Riviste
Libri
Atti
Editori
Blog
Contatti
Cerca
EUR
USD
GBP
Italiano
English
Deutsch
Polski
Español
Français
Italiano
Carrello
Home
Riviste
Gravitational and Space Research
Volume 3 (2015): Numero 2 (December 2015)
Accesso libero
New Insights in Plant Biology Gained from Research in Space
Ashley E. Cannon
Ashley E. Cannon
,
Mari L. Salmi
Mari L. Salmi
,
Gregory Clark
Gregory Clark
e
Stanley Roux
Stanley Roux
| 01 dic 2015
Gravitational and Space Research
Volume 3 (2015): Numero 2 (December 2015)
INFORMAZIONI SU QUESTO ARTICOLO
Articolo precedente
Articolo Successivo
Sommario
Articolo
Immagini e tabelle
Bibliografia
Autori
Articoli in questo Numero
Anteprima
PDF
Cita
CONDIVIDI
Article Category:
Review
Pubblicato online:
01 dic 2015
Pagine:
3 - 19
DOI:
https://doi.org/10.2478/gsr-2015-0007
© 2015 Ashley E. Cannon et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Figure 1.
Early growth and developmental time-line of Ceratopteris richardii spores. Spore germination is initiated by water and red light. Within hours of initiation, calcium enters through channels at the bottom of spores and there is an efflux of calcium out of the top. The calcium efflux peaks between 7 and 12 hours after light-initiated germination begins. Polarity of development is set by gravity after 24-30 hours of growth and it results in the downward migration of the cell nucleus and a subsequent asymmetrical cell division. A visual representation of the direction of polarity set by gravity is the emergence of a downward-growing rhizoid 72 hours after germination begins.
Figure 2.
Hypothetical model showing the role of eATP and calcium in polarization of Ceratopteris richardii spores. In response to gravity, an undefined mass would settle, selectively activating mechano-sensitive channels primarily along the bottom of the spore. These mechano-sensitive channels could release ATP. The ATP released accumulates asymmetrically, resulting in a gradient where the eATP on the bottom of the spore is higher than the top. The eATP could activate calcium channels directly or indirectly, establishing or contributing to the initiation of the trans-cell Ca2+ current that is essential for gravity-directed polarization.