EurekaMag.com logo
+ Site Statistics
References:
52,725,316
Abstracts:
28,411,598
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

The loss of desiccation tolerance during germination an ultrastructural and biochemical approach


Protoplasma 105(3-4): 225-240
The loss of desiccation tolerance during germination an ultrastructural and biochemical approach
Rye [Secale cereale cv. Lovaszpatonai] embryos of high viability and vigor can be imbibed for 1 h, dehydrated and subsequently rehydrated without harm. Extension of the imbibition period results in progressive structural damage to cells of both the embryonic root and the coleorhiza. Greatest sensitivity to this treatment is shown by the microtubule assembly system and the plasmalemma which loses its integrity permitting the egress of ribosomes and lipid towards the cell wall. Further stress results in fragmentation of the endoplasmic reticulum, disruption of plastid, mitochondrial and nuclear membranes and the disp dispersion of the contents of provacuoles. Damage is initiated during the drying of imbibed embryos but it is compounded by subsequent rehydration. Coleorhiza cells, particularly those distal to the root, which normally develop very rapidly during the early hours of germination are most sensitive to desiccation. The onset of sensitivity to desiccation (.apprx. 3 h after imbibition) corresponds with a transitory halt in the increasing rate of protein synthesis and with the start of DNA replication. These results are discussed in relation to DNA repair and the hardening of seeds to stimulate rapid growth following rehydration.


Accession: 006712148

DOI: 10.1007/bf01279221



Related references

Loss of desiccation tolerance during germination in neo-tropical pioneer seeds: Implications for seed mortality and germination characteristics. Seed Science Research 17(4): 273-281, 2007

Ultrastructure of pea embryonic axes during germination and the associated loss of desiccation tolerance. Plant Biology (Rockville) : 64, 2001

Loss of desiccation tolerance in Copaifera langsdorffii Desf. seeds during germination. Brazilian Journal of Biology 74(2): 501-508, 2014

Loss of desiccation tolerance during seed germination a free radical mechanism of injury. Leopold, A C (Ed ) Membranes, Metabolism, And Dry Organisms; Conference on Anhydrous Biology, Bellagio, Italy, October 21-25, 1985 374p Cornell University Press: Ithaca, New York, Usa; London, England, Uk Illus 85-101, 1986

Influence of protoplasmic water loss on the control of protein synthesis in the desiccation-tolerant loss Tortula ruralis. Ramifications for a repair-based mechanism of desiccation tolerance. Plant physiology 97(4): 1501-1511, 1991

Physiological and biochemical changes during the loss of desiccation tolerance in germinating Adenanthera pavonina L. seeds. Anais Da Academia Brasileira de Ciencias 87(4): 2001-2011, 2016

Proteomic analysis of embryonic axis of Pisum sativum seeds during germination and identification of proteins associated with loss of desiccation tolerance. Journal of Proteomics 77: 68-86, 2013

Post desiccation germination of mature seeds of tea (Camellia sinensis L.) can be enhanced by pro-oxidant treatment, but partial desiccation tolerance does not ensure survival at -20°C. Plant Science 184: 36-44, 2012

Free radical processes induced by desiccation in germinating maize The relationship with respiration and loss of desiccation tolerance. Proceedings of the Royal Society of Edinburgh Section B (Biological Sciences) 102(0): 211-218, 1993 ( ), 1994

Influence of Protoplasmic Water Loss on the Control of Protein Synthesis in the Desiccation-Tolerant Moss Tortula ruralis: Ramifications for a Repair-Based Mechanism of Desiccation Tolerance. Plant Physiology 97(4): 1501-1511, 1991