2 edition of Repeated imbibition/desiccation cycles and seed viability. found in the catalog.
Repeated imbibition/desiccation cycles and seed viability.
Written in English
Thesis (M.Sc.)--The Queen"s University of Belfast, 1983.
|The Physical Object|
In seeds, most of the evidence for cellular repair derives from investigations into the causal relationship between cellular damage and loss of viability during storage (Bewley and Black, ). Consequently, one has to keep in mind that the repair processes that have been identified may not play a major role in desiccation tolerance per se but. Loss of moisture in mature seeds of Quercus robur L. was associated with loss of viability, a rise in lipid peroxidation and build‐up of free radicals. Radical‐initiated damage was largely confined to the embryonic axes as their moisture contents declined to below 47 %.
More than 50% of freshly isolated, cleaned (sarcotesta removed) but undried seeds germinated at 26°C. However, desiccation to approx. 20%seed RH reduced germination at this temperature to desiccation induced seed dormancy rather than viability loss. This updated and much revised third edition of Seeds: Physiology of Development, Germination and Dormancy provides a thorough overview of seed biology and incorporates much of the progress that has been made during the past fifteen years. With an emphasis on placing information in the context of the seed, this new edition includes recent advances in the areas of molecular biology of Price: $
Seed Imbibition Triggers Changes in the Expression of Genes Encoding Enzymes From the Trehalose Pathway Along With Alteration of the Carbohydrate Metabolism in Medicago truncatula. Following the bioinformatic identification of M. truncatula TPS, TPP, and TRE genes, qRT-PCR was carried out to investigate gene expression during regular seed imbibition (). Analysis of the cell cycle in sugarbeet seed during development, maturation and germination. Cell cycle activity in sugarbeet seed was studied by flow cytometry. During embryo development the G 2 /G 1 ratio decreases up to days after pollination and then cell cycle activity is arrested (the G 2 /G 1 ratio becomes constant). This is an.
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Seeds which germinate rapidly and produce vigorously growing seedlings have higher respiratory rates and lower respiratory quotients than non-vigorous seeds. Vigorous and non-vigorous seeds can sometimes be distinguished within 1 hr after the start of imbibition by differences in by: 3.
Assessment of desiccation sensitivity of tea embryos for cryopreservation sensitive to repeated imbibition and desiccation cycles seeds were dried to % with % viability, indicating. Upon imbibition, the quiescent dry seed rapidly resumes metabolic activity.
The structures and enzymes necessary for this initial resumption of metabolic activity are generally assumed to be present within the dry seed, having survived, at least partially intact, the desiccation phase that termi- nates seed Cited by: Desiccation tolerance is one of the most fundamental properties of seeds.
It is acquired late in seed development and is considered necessary for the completion of the plant's life cycle, as an. Seeds of Magnolia ovata were dried to different water contents to assess the viability and transcript abundance of genes related to seed development, cell cycle, cytoskeleton and desiccation expression of development, cell cycle and cytoskeleton relative genes (ABI3, CDC2-like and ACT2) alone could not explain the germination behaviour of M.
ovata seeds in relation to drying Cited by: 4. The energy limitation during the period of reserve accumulation becomes even more problematic during seed desiccation because the viscosity and molecular packing density of the cells increase gradually and transform the tissue into a glassy mat Exposure of soybean seeds to high oxygen shows that late maturing seeds can recover from the low energy status, supporting the notion that.
ADVERTISEMENTS: The following points highlight the top five experiments on imbibition. The experiments are: 1.
Demonstration of Imbibition Process 2. Demonstration of Repeated imbibition/desiccation cycles and seed viability. book Effect of Osmotic Concentration (Or Osmotic Pressure) On Imbibition 3.
Demonstration of Pressure Released Due to Imbibition 4. Demonstration of Release of Heat Energy during Imbibition 5. List of top two experiments on Imbibition in Plants: 1. Effect of Seed Coat on Water Absorption by Dry Seeds 2.
Effect of the Nature of Seed on Water Absorption. Experiment # 1. Effect of Seed Coat on Water Absorption by Dry Seeds: The process ‘imbibition’ is considered as a special type of diffusion since the net movement of water is along. cycle. This is an extraordinary event, but very common and from a technical point of view, poorly understood.
Seed moisture content plays a critical role in all aspects of seed science, technol ogy, and commercial trade. In this publication, we explore the interesting facets of biological water in general and seed moisture content in particular.
Imbibition of Seeds in Metal Salts and Water Uptake by Germinating Seeds Seeds of plants were supplied by the local Ministry of Agriculture office located in Kayseri, Turkey. Damaged or empty seeds hulls were discarded. The imbibition and germination experiments described below were conducted 4–6 months after seed collection.
Imbibition In Plants. Imbibition causes swelling of seeds and results in the breaking of testa. Imbibition is the initial step in seed germination. The water moves into ovules which are ripening into seeds by imbibition. Imbibition is dominant in the initial stage of water absorption by roots. Imbibition Pressure.
However, when the initial imbibition (i.e. predesiccation) time of the grains is taken into account, the total time that the seeds are hydrated before germination is completed is the same as control (once-imbibed) grains.
Hence it appears that events occurring prior to desiccation do not have to be repeated for germination to be completed. Hydration–dehydration cycles can frequently cause stress to seeds, but can also be used to improve germination.
However, the molecular basis of the stress caused is poorly understood. Herein, we examine the effects of hydration–dehydration cycles on seed viability and profile the membrane glycerolipid molecular species. We find that seed viability was not affected during the first two.
Rice Aldehyde Dehydrogenase7 Is Needed for Seed Maturation and Viability Jun-Hye Shin, Sung-Ryul Kim, Gynheung An Plant Physiology Feb(2) ; DOI: /pp Results.
Artificial aging of Pisum sativum (L.) seeds produced differential viability (highly viable “A” to dead “E” populations), and seedlings with different root and shoot lengths (classified into “vigor types” 4 to 0; explanations in Fig.
1A).Highly viable seeds germinated when they reached a threshold MC of ∼55%, found in untreated A and aged B seeds alike. Smith, M T and Berjak, P () Deteriorative changes associated with the loss of viability of stored desiccation-tolerant and desiccation-sensitive seeds.
pp – in Kigel, J, Galili, G (Eds) Seed development and germination. Recently, it was found that visibly germinated seeds of cucumber (Cucumis sativus L.) and Impatiens walleriana could be made desiccation tolerant, thereby retaining full viability upon drying (Bruggink and van der Toorn, ).
Tolerance to desiccation was generated by a pretreatment in – MPa PEG at 8 °C for up to 7 days folowed by. Interestingly, and despite no difference in mature seed water content before or after treatment in an LiCl hygrostat (Fig, 1B, Initial and LiCl, respectively), atem seeds take up more water than wild-type seeds (Fig, 1B, Hydrated).On drying, both genotypes lose >97% of their water content during the assay period, but mutant seeds lose more water than wild-type seeds.
Throughout the study, seed desiccation tolerance was quantified both in terms of water content and water activity. Whatever the parameter used, the extent of seed desiccation tolerance in F1 hybrids corresponded to that of the midparent, thus indicating an additive inheritance of seed desiccation tolerance at the F1 level.
The average seed size was x x cm (length x width x thickness) whereas the average embryo length was mm and represented approximately 1/40 of the total seed volume. Viability of Magnolia ovata seeds after desiccation and Expression of genes related to seed development, cell cycle and cytoskeleton during drying and imbibition.
Imbibition is a seed's or a plant’s absorption of water, a process that causes swelling in some plant cells and organs. Seeds undergo imbibition swelling when exposed to water.
The process of imbibition is important to the plant since it encourages seedlings to emerge out of the soil and establish themselves.Despite this, the phenomenon of seed desiccation sensitivity appears to have been largely overlooked by ecologists.
For example, in a recent book reviewing current themes in plant regeneration ecology (Fenner ), seed desiccation sensitivity is explicitly mentioned in just three of the 16 chapters.
This is perhaps a consequence of the trait.Raffinose family oligosaccharides (RFOs) have been implicated in mitigating the effects of environmental stresses on plants.
In seeds, proposed roles for RFOs include protecting cellular integrity during desiccation and/or imbibition, extending longevity in the dehydrated state, and providing substrates for energy generation during germination.
A gene encoding galactinol synthase (GOLS), the.