Pollen germination is the process by which a pollen grain attaches to the stigma of a flower and develops a pollen tube that transports sperm to the ovule for fertilization. The document includes microscope images showing pollen grains, pollen tubes growing from grains attached to stigmas, and cellular structures within pollen tubes at magnifications from 4.5x to 400x.
The Shoot apex is also known as the terminal bud of plants that grows from 0.1-1.0 mm and consists of the apical meristem, developing leaves and the immediate surrounding leaf primordial. The shoot apex is present in both dicot and monocot plants.
This PPT offers a birds' eye view of the Angiosperm Phylogeny Group III to cover the course content and its complexity.It also covers the emerging trend of the plants taxonomic domain.
The Shoot apex is also known as the terminal bud of plants that grows from 0.1-1.0 mm and consists of the apical meristem, developing leaves and the immediate surrounding leaf primordial. The shoot apex is present in both dicot and monocot plants.
This PPT offers a birds' eye view of the Angiosperm Phylogeny Group III to cover the course content and its complexity.It also covers the emerging trend of the plants taxonomic domain.
Plant embryology and palynology, history of plant embryology, General basic terms in embryology (sporogenesis, Gametogenesis, Pollination, Fertilization, Double fertilization, Endosperm, Embryogenesis), Diagnostic embryological characters, Primitive and advance embryological characters, Role of embryology and palynology in taxonomy.
Pollen pistil interaction
Types of Incompatibility in plants
Methods to overcome Incompatibility
Prepared by
Dr. T. Annie Sheron
Assistant Professor of Botany
DEPARTMENT OF BOTANY
KAKATIYA GOVERNMENT COLLEGE, HANAMKONDA
This is an excerpt of basic concepts and principles of palynology as it applies to systematics and taxonomy of plants. Credits are given to the authors and owners of photographs used in the entire presentation.
description of different types of reproductive organs, developmental stages and process of reproduction in Cycas. Various internet sources have been used.
In this presentation you will get to know about aspects of paleobotany, about coal and petroleum exploration and its extraction and how paleobotany is related to coal and petroleum.
This presentation was given by Dr. Avishek Bhattacharjee in Botanical Nomenclature Course held in Botanical Survey of India, Eastern Regional Centre, Shillong in November 2016. This may be helpful to the undergraduate and post graduate Botany students to understand different types of taxonomic literature, especially Flora, Revision and Monograph.
Plant embryology and palynology, history of plant embryology, General basic terms in embryology (sporogenesis, Gametogenesis, Pollination, Fertilization, Double fertilization, Endosperm, Embryogenesis), Diagnostic embryological characters, Primitive and advance embryological characters, Role of embryology and palynology in taxonomy.
Pollen pistil interaction
Types of Incompatibility in plants
Methods to overcome Incompatibility
Prepared by
Dr. T. Annie Sheron
Assistant Professor of Botany
DEPARTMENT OF BOTANY
KAKATIYA GOVERNMENT COLLEGE, HANAMKONDA
This is an excerpt of basic concepts and principles of palynology as it applies to systematics and taxonomy of plants. Credits are given to the authors and owners of photographs used in the entire presentation.
description of different types of reproductive organs, developmental stages and process of reproduction in Cycas. Various internet sources have been used.
In this presentation you will get to know about aspects of paleobotany, about coal and petroleum exploration and its extraction and how paleobotany is related to coal and petroleum.
This presentation was given by Dr. Avishek Bhattacharjee in Botanical Nomenclature Course held in Botanical Survey of India, Eastern Regional Centre, Shillong in November 2016. This may be helpful to the undergraduate and post graduate Botany students to understand different types of taxonomic literature, especially Flora, Revision and Monograph.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
2. First of all, Germination is the development of a plant. Pollen Germination is when a pollen grain is attached to the stigma of a flower and then germinates to create a pollen tube toward the flower’s ovule. This pollen tube transports the sperm toward the ovule to fertilize it. Pollen Germination
Many aspects of Angiosperm pollen germination and tube growth are discussed including mechanisms of dehydration and rehydration, in vitro germination, pollen coat compounds, the dynamic involvement of cytoskeletal elements (actin, microtubules), calcium ion fluxes, extracellular matrix elements (stylararabinogalactan proteins), and control mechanisms of gene expression in dehydrating and germinating pollen.Pollen germinates when the stigma releases a sugar like sucrose, then it starts growing the pollen tube. Though, this only occurs if the stigma recognizes the pollen grain. Another germination event during the life cycle of gymnosperms and flowering plants is the germination of a pollen grain after pollination. Like seeds, pollen grains are severely dehydrated before being released to facilitate their dispersal from one plant to another. They consist of a protective coat containing several cells (up to 8 in gymnosperms, 2-3 in flowering plants). One of these cells is a tube cell. Once the pollen grain lands on the stigma of a receptive flower (or a female cone in gymnosperms), it takes up water and germinates. Pollen germination is facilitated by hydration on the stigma, as well as by the structure and physiology of the stigma and style.[2] Pollen can also be induced to germinate in vitro (in a petri dish or test tube).[6][7]During germination, the tube cell elongates into a pollen tube. In the flower, the pollen tube then grows towards the ovule where it discharges the sperm produced in the pollen grain for fertilization. The germinated pollen grain with its two sperm cells is the mature male microgametophyte of these plants
Anther Cruz de Malta 4.5x
Stigma Cruz de Malta 5.6xStigma stays closed until the ovule’s matured and also to avoid self-pollination.
Stigma Cruz de Malta 5.6x When the stigma has opened, it is ready to receive pollen from other flowers. The pollen cells are trapped by the adhesive fibers of the stigma. Though, the stigma doesn’t send the signal to germinate unless it is identified as pollen cell from a cruz de malta flower.
Impatiens Pollen 5.6x
Pollen tubes 40xBrightfield
Pollen Tubes 100x Brightfield
Pollen tubes 100x Phase
Pollen tube 200x BrightfieldThe pollen tube needs water and nutrients to elongate. Which these nutrients are carried by the organelles moving alongside the Vacuole.