Sexual Reproduction in Flowering Plants: Stamen and Pistil Identification

Function of the Stamen

• The stamen is the male reproductive part of a flower, responsible for producing pollen.
• It typically consists of two main parts: the anther and the filament.

Attachment of Stamen

• The filament, part of the stamen, attaches to the thalamus or petal of the flower.

Microsporangia in Angiosperm Anther

• Each lobe of an angiosperm anther typically contains four microsporangia.

Anther Structure

• An anther with two theca in each lobe is described as a dithecous anther.
• The transverse section of an anther reveals a complex layered structure.

Pollen Sacs Development

• Within microsporangia, microspore mother cells develop further and become pollen sacs.

Function of Wall Layers in Microsporangium

• The outer three wall layers of a microsporangium provide protection and structure for developing pollen grains.

Nourishment of Pollen Grains

• The inner wall layer of a microsporangium functions to nourish the developing pollen grains throughout their development.

Role of Tapetal Cells

• Tapetal cells play a crucial role in pollen development by supplying nutrients and substances needed for maturation.
• Tapetal cells generally possess more than one nucleus to enhance their metabolic capacity for supporting pollen growth.

Cell Types in Young Anther

• When the anther is young, it is primarily occupied by sporogenous cells in the center of each microsporangium.

Process During Microsporogenesis

• During microsporogenesis, the cells of sporogenous tissue undergo meiosis, resulting in the production of microspores.