Skip to main content

Structure of typical embryo sac, (Polygonum, Allium and Adoxa type)

 Structure of typical embryo sac, (Polygonum, Allium and Adoxa type)

Certainly! The structure of the embryo sac can vary among different plant species. Let's take a closer look at the structure of the embryo sac in the Polygonum (type Polygonum), Allium (type Allium), and Adoxa (type Adoxa) plants.

1. Polygonum Type:

  • Monosporic Development:
    • The embryo sac develops from a single functional megaspore.
  • Antipodal Cells:
    • Three antipodal cells located at the opposite end of the embryo sac from the egg cell.
  • Egg Apparatus:
    • Consists of two synergids and one egg cell. The synergids guide the pollen tube to the egg cell.
  • Central Cell:
    • Contains two polar nuclei.
  • Nuclei Arrangement:
    • The embryo sac typically has eight nuclei in total.

2. Allium Type:

  • Bisporic Development:
    • Arises from one of the two dyads formed during the initial meiotic division (Meiosis I) of the Megaspore Mother Cell.
  • Antipodal Cells:
    • Three antipodal cells located at the opposite end of the embryo sac from the egg cell.
  • Egg Apparatus:
    • Consists of two synergids and one egg cell.
  • Central Cell:
    • Contains two polar nuclei.
  • Nuclei Arrangement:
    • The embryo sac typically has eight nuclei in total.

3. Adoxa Type:

  • Pentasporic Development:
    • Unlike the monosporic development in Polygonum and Allium types, the embryo sac in Adoxa type develops from five megaspores.
  • Antipodal Cells:
    • Three antipodal cells located at the opposite end of the embryo sac from the egg cell.
  • Egg Apparatus:
    • Consists of two synergids and one egg cell.
  • Central Cell:
    • Contains two polar nuclei.
  • Nuclei Arrangement:
    • The embryo sac typically has seven nuclei in total.

In Summary: While there are variations in the number of megaspores that contribute to the development of the embryo sac, the basic structure includes antipodal cells, the egg apparatus (synergids and egg cell), and a central cell with polar nuclei. These structures play crucial roles in guiding pollen tubes, facilitating fertilization, and initiating the formation of seeds in the respective plant species.

It's important to note that the specific details can vary within each type, and variations may exist among individual species within the same type. Understanding these variations contributes to our appreciation of the diversity in plant reproduction

Popular posts from this blog

Welcome to Let Me Explain (A Part of bionexts.in)

  Welcome to my Blogspot! Here, I explain various topics related to Bio-Medical Science with detailed class study notes. I trust it will be helpful for you. MISSION OF THE PROJECT My mission is to provide you Class Study Notes with a clear understanding of various Bio-Medical related topics, especially professional courses, using easy language. Don't worry; I'll also include other topics.  ☺️ CLICK ANY ONE OF THE SUBJECTS Immunology   Techno Professional Skill  Developmental Biology   Molecular Biology Cell Biology Genetical Engineering Biostatistics Bioinformatics Basic Acclimatization Skill Animal Biotechnology Medical Biotechnology Industrial Biotechnology Plant and Agricultural Biotechnology Research Methodology, IPR and Bioethics Are You Preparing For The GATE Examination Also! Click Here  Click Here   Are You Preparing For The UPSC Examination Also! Click Here Yes And Normal General Science Click Here And I'm going to explain to you the biology t...
Read more

Animal Biotechnology

On this page, you will find all topics related to Immunology! Here Every Major Topic Includes Sub-Major Topics. Find the topic you want to learn! Describe the basics of animal cell culture Introduction Definition, scope, and importance. Historical developments in animal biotechnology Basic requirement for animal cell culture Types of animal cells and their characteristics. Types of Culture Primary and secondary culture. Cell Cine & Maintenance and preservation of cell lines. history of animal cell culture Suspension culture ,  Cell cloning and hybridization ,  3D cultures ,  Scaling up & Growth factors.  Cell line and maintenance, viability test, cytotoxicity  Describe the cell culture and vaccine production Application of cell culture technology in the production of different vaccines and pharmaceutical proteins. Explain reproductive structures and artificial fertilization  Structure of sperm and ovum Cryopreservation of sperms and ova of...
Read more

MOLECULAR BIOLOGY

On this page, you will find all topics related to Immunology! Here Every Major Topic Includes Sub-Major Topics. Find the topic you want to learn! Genome Introduction to the Genome Prokaryotic and Eukaryotic Genome The Central Dogma of life C value paradox Genes are made of DNA Semi-conservative mode of DNA replication Cot Curve   Repetitive DNA sequences (satellite DNA, LINE, SINE etc) DNA melting and buoyant density Neucleosome Phasing DNA Replication and Recombination Replication initiation, elongation and termination in prokaryotes and eukaryotes DNA Replication (Explain) The Meselson-Stahl experiment Homologous Recombination at the molecular level The Holliday Model Double-stranded DNA repair model Removing of the DNA Primer / Flap Model DNA damage and Repair Mutation- Nonsense, missense and point mutations Intragenic and Intergenic suppression Frameshift Mutation Mutagens Transposition Transposable genetic elements in prokaryotes and eukaryotes Mechanism of transposition Role ...
Read more