1 edition of Pollen wall studies: composition, structure and development found in the catalog.
Pollen wall studies: composition, structure and development
|Statement||by Darlene Helmich Southworth.|
|The Physical Object|
|Pagination||100 leaves of plates :|
|Number of Pages||100|
The 22 papers collected in this special issue are dedicated to the memory of Bernard Lugardon (), one of the pioneers of transmission electron microscopy analysis of spores/pollen. Topics discussed include the description of cellular features in extant spores/pollen including studies of ontogeny (including exospore/exine development).Cited by: 1. The study of pollen should encompass all structural and ornamental aspects of the grain. Pollen morphology is studied using LM and SEM and is important to visualize the general features of a pollen.
A pollen grain is a microscopic body that contains the male reproductive cell of a plant. It is crucial in a plant's fertilization process. Learn more about this tiny structure and take a short. In this study, we characterized the rice (Oryza sativa) male sterile mutant, defective pollen wall 2 (dpw2), which showed an abnormal anther cuticle, a defective pollen wall, and complete male sterility. Compared with the wild type, dpw2 anthers have increased amounts of cutin and waxes and decreased levels of lipidic and phenolic by:
The majority of these genes are involved in pollen-wall formation including tapetal development, sporopollenin biosynthesis and transport, callose wall and primexine deposition. This chapter introduces the recent advance of pollen-wall formation in genetic and molecular by: 9. Such is the case with the literature on the changing nature and organization of work and the social and economic consequences of the growth of new forms of work. This literature was reviewed and synthesized into a new research agenda that offers an integrated perspective on the by: 2.
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This chapter discusses the stratification of angiosperm pollen grain walls. Pores and slits form conspicuous features of the pollen wall. Shortly before final maturation of the pollen grains, surface coatings of various kinds are acquired, derived from secretory or breakdown products of the by: Pollen grains vary in shape, size and pollen wall composition and this is likely to affect DNA extraction efficiency for different species .
The DNA analysed for DNA metabarcoding often comes. All these studies indicate that RG-II is important for pollen tube growth but none of the studies have shown biochemically that the RG-II structure in the pollen or the pollen tube was impaired. The development of specific probes targeting the different side chains of RG-II should facilitate studies on this non-abundant but important pectin motif in pollen tube growth but to date such tools are not Cited by: Pollen wall development in gymnosperms.
Although differences in pollen wall structure and development are evident in different extant and extinct gymnosperm groups, the main ontogenetic elements appear to be homologous (summarized in Lugardon ; Wellman ).
The pollen mother cell undergoes meiosis to form four haploid by: Studies on the mechanism(s) of pollen digestion remain inconclusive, but suggest that differences in digestibility among pollen types may reflect differences in pollen wall porosity, thickness.
Diversity in Pollen Coat Composition. The structure of the pollen coat also is adapted to different delivery mechanisms. Insect pollination is correlated with an abundant pollen coat (Pacini and Franchi, ). For example, the Brassica pollen coat can constitute 10 to 15% of the mass of the pollen grain (Dickinson et al., ).Cited by: pollen from threats such as bacterial and fungal attacks and severe environmental conditions.
The pollen wall consists of three layers, the exine (approximately μm in thick-ness), intine (approximately μm in thickness) and try-phine (or pollen coat, approximately μm in thickness). The exine is the outermost layer of the pollen.
The anther and pollen gene development network comprises of a complex system of gene expression and interactions; however, although species may have some unique mechanisms, there is a considerable degree of conservation (Wilson and Zhang ).Cited by: Phenotypic Analysis of the dpw Mutant Anther Development.
To investigate the cellular defects of the dpw mutant during pollen development, we first examined the integrity of the pollen wall following chemical treatments.
The abnormal pollen exine of pollen wall defective mutants is usually sensitive to chemical treatment, such as acetic anhydride (Aarts et al., ).Cited by: Background. Glutathione is an important antioxidant and redox buffer in eukaryotes and most prokaryotes that fulfills many roles in plant metabolism and plant defense during abiotic and biotic stress conditions in the sporophyte , but its role remains largely unknown for the the sporophyte, glutathione is involved in the detoxification of reactive oxygen species (ROS), redox Cited by: The aim of this study was to observe pollen wall ontogeny in pollen grains at various stages of development, from pollen mother cells to fully mature grains, using a light microscope (LM) for identifying the stages of development and a Focused Ion Beam-Scanning Electron Microscope (FIB-SEM) for examination and sectioning of the pollen earlier work has shown that the FIB Author: A.
House, K. Balkwill. Pollen: Development and Physiology focuses on pollen physiology, with emphasis on the living pollen grains, their growth, and essential biological functions. Topics covered in this book include the role of nucleus and cytoplasm in microsporogenesis; the development of the pollen grain wall; the metabolism of pollen tubes; pistil-pollen interactions; and incompatibility.
The pollen tube is a fast tip-growing cell carrying the two sperm cells to the ovule allowing the double fertilization process and seed setting. To succeed in this process, the spatial and temporal controls of pollen tube growth within the female organ are critical. It requires a massive cell wall deposition to promote fast pollen tube elongation and a tight control of the cell wall remodeling Cited by: The pollen wall consists of an exine and an intine.
The mechanism underlying its formation is not well understood. Glycosyltransferases catalyze the modification of biological molecules by attaching a single or multiple sugars and play key roles in a wide range of biological processes.
We examined the role of GLYCOSYLTRANSFERASE1 (OsGT1) in pollen wall development in rice ( Cited by: Honys et al. Male gametophyte development and function Floriculture, Ornamental and Plant Biotechnology Volume I © Global Science Books, UK Fig.
1 Bicellular and tricellular pollen. Pollen of bicellular - hop (A), and tricellular - elderberry (B), stained with the DNA stain r DNA within the vegetative (V), generative (G) or. The exine (the outer, resistant, and rigid layer) is richly sculptured and ornamented.
It is composed of sporopollenin, an organic biopolymer of extremely high stability. The outer pollen wall with its structures and surface substances takes part in the process of adaptation between the pollen and by: The biosynthesis, composition and assembly of the outer pollen wall: A tough case to crack we performed a thorough study on the cell wall composition during pollen development in mango.
The Arabidopsis thaliana MALE STERILITY1 (MS1) gene is critical for viable pollen formation and has homology to the PHD-finger class of transcription factors; however, its role in pollen development has not been fully defined.
We show that MS1 transcription appears to be autoregulated by the wild-type MS1 transcript or protein. Using a functional green fluorescent protein (GFP) fusion to Cited by: Aliphatic alcohols naturally exist in many organisms as important cellular components; however, their roles in extracellular polymer biosynthesis are poorly defined.
We report here the isolation and characterization of a rice (Oryza sativa) male-sterile mutant, defective pollen wall (dpw), which displays defective anther development and degenerated pollen grains with an irregular by: The timely programmed cell death (PCD) of the tapetum, the innermost somatic anther cell layer in flowering plants, is critical for pollen development, including the deposition and patterning of the pollen wall.
Although several genes involved in tapetal PCD and pollen wall development have been characterized, the underlying regulatory mechanism remains : Muhammad Uzair, Dawei Xu, Lukas Schreiber, Jianxin Shi, Wanqi Liang, Ki-Hong Jung, Mingjiao Chen, Zh.
Pollen development is a complex and highly conserved process in angiosperms (McCormick ; Blackmore et al. ) that has been widely studied in model plants such as Arabidopsis thaliana or.The Pollen Book, Chapter 1 Bee Product Science, 15 January 3 The transfer of pollen grains to the female reproductive structure (pistil in angiosperms) is called pollination.
This transfer can be mediated by the wind, in which case the File Size: KB.You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them.