PTERIDOLOGY | SELAGINELLA

MALE & FEMALE GAMETOPHYTE DEVELOPMENT
MALE GAMETOPHYTE

* 0.015 to 0.05 ml
* It has two walls , outer exine and inner intine
* Exine - thick , scluptured and also called as exospore
* Intine - thin, delicate .also called endospore 
* It consists of reserve food materials
* Up to 13 celled condition - development is inner
*Pollination is also called small polination 
* After liberation - numerous development 
*4 primary androgonial cell - androgonial mother cell
*Anthrozites - antherozoid
FEMALE GAMETOPHYTE
* 1.5 to 5 mm
* It has two walls exine , mesospore and intine
*  Has reserve food materials
* Germination takes place inner sites
* It totally depends on the species
* Germination
* Nucleus - numerous divition - formation of free nucleus
* it has large vacuole - peripheral side 
Wall formation after numerous divition


Comments

Post a Comment

Popular posts from this blog

Gymnosperm - Cycas male & female structures

Image
Introduction Gymnosperms are the plants that doesn't produce flowers. So their reproductive structures are cones. Cycas is one of a plant belongs to the group gymnosperms VEGITATIVE REPRODUCTION vegetative reproductive structures of cycas is called bulbils  or  adventitious buds                        bulbil of cycas *  Develop in the basal part of the stem, in the crevices between persistent leaf base  *  Decurrent base is covered with scale leaves and a few foliage leaves,develop from the centre. * After falling on soil, develop to a new one *  Male plant bearing bulbil develop as male cycas  *   Those from female plant develop as female cycas SEXUAL REPRODUCTION Cycas is a dioecious plant ( male and female on different plants ) MALE CONE *  Microsporangiate strobilus * Develop singly at the apex of stem *  Stem may get arrested for the crown *  Growth will resumed by development of lateral bud,arising from the cone base  *  The cone get pushed one side
Read more

PTERIDOPHYTE , SELAGINELLA

Image
Introduction Internal morphology of plant shows the structure and arrangement of cells in the plant body. In this section we are going to have a look to internal morphology of selaginella stem,leaf,root & ligule                                                                                    Selaginella sporophytic plant body   STEM *  Cutinised *  Divided in to 3 regions. Epidermis, cortex, vascular cylinder or stele *   Epidermis - uniseriate - prosenchymatous (  plant tissue consisting of long narrow cells with pointed ends) *  Devoid of stomata  and hairs * Cortex  :- multiseriate - compactly arranged parenchyma cells *  In maturity cortex is differentiated into two *  Outer cortex - thick walled lignified parandhama - hypodermis * inner cortex - thin- walled - chlorenchyma * In xerophytes cortex - only thick-walled schlerenchyma *   Endodermis  :- radially elongated endodermal cells - trabeculae *  They posses casparian    bands on lateral sides * Stele :- stel
Read more

PTERIDOLOGY SELAGINELLA

Image
Introduction In this section we are going to discuss about the reproduction of Selaginella. Selaginella reproduce manily two ways Vegitative Reproduction and sexual reproduction Vegitative Reproduction In vegitative Reproduction mainly 4 processes are takes place * Fragmentation * Dormant buds * Bulbils * stem-tubers Fragmentation * During favorable conditions * Prostate branches produce roots * These branches brake * New sporophyte produced Dormant buds * Produced in areal branches * During favorable conditions * Develop in to new plant Stem-tubers * Produced at the apices of areal branches * During favorable conditions  * Develop in to new sporophytic plant body                                                                           Sexual Reproduction Sexual reproduction occurs by formation of spores. Selaginella is heterosporous, which produce two types of spores. Megaspores and Microspores                     V.S of Selaginella strobili * Sporophylls are generally ar
Read more