2 edition of Cytokinin involvement in seed germination and some other plant processes. found in the catalog.
Cytokinin involvement in seed germination and some other plant processes.
Norman Leonard Biddington
Thesis (Ph.D.)- University of Birmingham, Dept of Plant Biology.
THE LIGHT ENVIRONMENT. The initial period of Arabidopsis seedling growth can be divided into three major stages (Fig. 1B; reviewed in Casal et al., ; Maloof et al., ; Neff et al., ).The first is germination. Factors including availability of water and temperature, in addition to light, play a large role in determining the timing of seedling emergence (Seed Dormancy and Germination. BRs regulate a wide range of growth and developmental processes, including cell elongation, seed germination, stomata formation, vascular differentiation, plant architecture, flowering, male fertility and senescence. Accumulating evidence supports the fact that there is a crosstalk between BR and GA signaling pathways.
Seed Development, Dormancy and Germination provides a comprehensive overview of seed biology from the point of view of the developmental and regulatory processes that are involved in the transition from a developing seed through dormancy and into germination and seedling growth. This paper studied the phyA-dependent transcriptome when germination is induced by a far-red pulse in Arabidopsis seeds. Auxin- and GA-associated elements were overrepresented in genes whose expressions were modified by phyA. Although phyA and PIL5 signaling pathways share some molecular components, our data suggest that phyA signaling is partially independent of PIL5 when germination is Cited by:
We used loss-of-function mutants to study three Arabidopsis thaliana sensor histidine kinases, AHK2, AHK3, and CRE1/AHK4, known to be cytokinin receptors. Mutant seeds had more rapid germination, reduced requirement for light, and decreased far-red light sensitivity, unraveling cytokinin functions in seed germination control. Triple mutant seeds were more than twice as large as wild-type . Today, owing to the versatile functionality and physiological importance of the phytohormone cytokinin (Ck) is a major focus of attention in contemporary wide areas of plant science. Cytokinins (Cks) have implicated in diverse essential processes of plant growth and development as well as in regulation of key genes responsible for the metabolism and activities of by:
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Cytokinins are a major group of plant hormones that control various processes in plant growth and development. Chemically they are N6-substituated adenine derivatives, including their respective. INTRODUCTION. Cytokinin is a plant hormone that plays positive and negative regulatory roles in many aspects of plant growth and development.
It stimulates the formation and activity of shoot meristems, is able to establish sink tissues, retard leaf senescence, inhibit root growth and branching, and plays a role in seed germination and stress by: We used loss-of-function mutants to study three Arabidopsis thaliana sensor histidine kinases, AHK2, AHK3, and CRE1/AHK4, known to be cytokinin receptors.
Mutant seeds had more rapid germination, reduced requirement for light, and decreased far-red light sensitivity, unraveling cytokinin functions in seed germination control.
Triple mutant seeds were more than twice as large as wild-type Cited by: Cytokinin and auxin have long been known to interact antagonistically, and more recent studies have shown that cytokinins also interact with other plant hormones to regulate plant development.
Influence of SW, KAR 1, and TMB on Lettuce Seed Germination. The effects of SW, KAR 1, and TMB on the germination of cv Grand Rapids lettuce seeds after 24 h were compared for dark and R and FR light ().At 25°C in the dark, germination in water control seeds was 12%.
However, when seeds were treated with KAR 1 and SW, the germination increased to 94% and 92%, : Shubhpriya Gupta, Lenka Plačková, Manoj G. Kulkarni, Karel Doležal, Johannes Van Staden. SEED DEVELOPMENT. Seed development comprises two major phases: embryo development and seed maturation.
Embryogenesis, which is a morphogenesis phase, starts with the formation of a single-cell zygote and ends in the heart stage when all embryo structures have been formed (Mayer et al., ).It is followed by a growth phase during which the embryo fills the seed sac Cited by: Numerous plant hormones interact during plant growth and development.
Elucidating the role of these various hormones on particular tissue types or developmental stages has been difficult with exogenous applications or constitutive expression studies. Therefore, we used tissue-specific promoters expressing CKX1 and gai, genes involved in oxidative cytokinin degradation and gibberellin (GA Cited by: In wild-type seed, ZR was the most abundant cytokinin except in dry seed (in which 2iP was highest) and in seeds that were completing germination.
In the latter case, a striking accumulation of Z-O-Glu was apparent (increasing from. In wild‐type seed, ZR was the most abundant cytokinin except in dry seed (in which 2iP was highest) and in seeds that were completing germination. In the latter case, a striking accumulation of Z‐O‐Glu was apparent (increasing from Cited by: S.D.
Clouse, in Encyclopedia of Applied Plant Sciences, Overview. Plant hormones are essential regulators of plant development beginning with seed germination and culminating in whole-plant senescence. Until recently it was generally believed that the five classes of compounds comprising abscisic acid, auxin, cytokinins, ethylene, and gibberellins could account for most or all of the.
Cytokinins are a class of phytohormones that regulate multiple aspects of plant growth and development including shoot and root growth, chloroplast development, seed fill, senescence, and nutrient uptake [1,2,3,4,5].They also regulate responses to the environment such as to abiotic and biotic stresses [2,3,6,7,8].Cytokinin signal transduction occurs through a multistep phosphorelay related to Author: Yan O.
Zubo, G. Eric Schaller. Plant hormones (also known as phytohormones) are signal molecules, produced within plants, that occur in extremely low hormones control all aspects of plant growth and development, from embryogenesis, the regulation of organ size, pathogen defense, stress tolerance and through to reproductive development.
Unlike in animals (in which hormone production is restricted to. Seed germination is crucial stage in plant development and can be considered as a determinant for plant productivity. Physiological and biochemical changes followed by morphological changes during germination are strongly related to seedling survival rate and vegetative growth which consequently affect yield and quality.
This study is aimed to focus on proceeding of the most vital metabolic Cited by: 3. Seed dormancy allows seeds to overcome periods that are unfavourable for seedling established and is therefore important for plant ecology and agriculture.
Several processes are known to be involved in the induction of dormancy and in the switch from the dormant to the germinating state. The role of plant hormones, the different tissues and genes involved, including newly identified genes in Cited by: SPINDLY (SPY) is a negative regulator of gibberellin (GA) responses; however, spy mutants exhibit various phenotypic alterations not found in GA-treated plants.
Assaying for additional roles for SPY revealed that spy mutants are resistant to exogenously applied cytokinin. GA also repressed the effects of cytokinin, suggesting that there is cross talk between the two hormone Cited by: Plants respond to abiotic stresses by activating a specific genetic program that supports survival by developing robust adaptive mechanisms.
This leads to accelerated senescence and reduced growth, resulting in negative agro-economic impacts on crop productivity.
Cytokinins (CKs) customarily regulate various biological processes in plants, including growth and : Ranjit Singh Gujjar, Kanyaratt Supaibulwatana. Many proteomics-based studies have been carried out in different plant species to understand the molecular processes of seed germination.
This has identified the involvement of proteins associated with energy metabolism, mobilization of storage reserves, cell cycle regulation, DNA replication, repair of damaged DNA, transcription, splicing Author: Neeti Sanan-Mishra, Anita Kumari.
Introduction. Hydrogen peroxide (H 2 O 2) is a reactive molecule that plays a dual role in plant physiological and developmental processes and in resisting mutual relationship between positive and negative functions performed by H 2 O 2 in biological systems depends on the H 2 O 2 concentration, on physiological conditions, and on the specificities of processes affected by H 2 O by: Since CKs are critically involved in various aspects of plant growth, development and physiology 6, such a highly fine-tuned mechanism ensures minimal perturbation of other Cited by: Physicochemical properties of seed covering tissues, such as testa and endosperm, affect the occurrence or the timing of seed germination.
Physiological repression may be present in the embryo itself in some species. Plant hormones such as abscisic acid and gibberellin affect the physiological status of the embryo.
Both these processes can affect crop production and the phytohormones which are produced by synergistic interactions between plants and soil bacteria can affect seed germination. Some plant genes, which are necessary for the activity of plant hormones and the other Cited by: 7.
Gibberellins (GAs) are a large family of tetracyclic diterpenoid plant growth regulators. Biologically active GA forms, GA 1, GA 3, GA 4, and GA 7, control different plant growth processes including seed germination, stem elongation, leaf expansion, and flower and seed development (Yamaguchi, ).Cited by: Gibberellins (GA) are key positive regulators of seed germination.
Although the GA effects on seed germination have been studied in a number of species, little is known about the transcriptional Cited by: 1.