Self pollination

self pollination, mechanisms, factors,adv, disdv.

1. Sub.:- Fundamentals of Plant Breeding Course No. :- APB- 5211 Credit hours:- 3(2+1) Lec . Topic :- Self Pollination ,mechanisms . Presented by:- Lt. Roshan Parihar , Asstt . Professor Deptt . of Genetics & Plant Breeding Indira Gandhi Krishi Vishwavidyalaya Raipur, C.G. BTC College of Agriculture & Research Station , Sarkanda , Bilaspur ,(CG)-495001

2. Why flowers pollinate? To reproduce and create new life, which are new flowers.

3. POLLINATION-  The process of transfer of pollen grains from anther of a flower to the stigma of same or different flower is called pollination.

4. SOME IMPORTANAT TERMINOLOGY MONOC E IOUS PLANTS :-When a flower contains both stamens and pistils, the flower is said to be perfect. The plant which contains perfect flowers is known as a monoecious plant because it has both male and female reproductive organs in the same plant DIOC E IOUS PLANTS:- When a plant bears either staminate flowers or pistillate flowers, the plant is known as a dioecious plant.  You can find only one type of flowers from a dioecious plant.  Male and female reproductive organs are located in separate plants.

5.  It is an essential step as it brings the male and female gamete closer for fertilization.  This process was first discovered by Camerarius in 1694.  TYPES OF POLLINATION- Self pollination / Autogamy Cross pollination / Allogamy

6. Pollination Self-pollination Pollen from the anther is transferred to the stigma

7. Self-pollination

8. Self Pollination Bees and other animals bring pollen from the flower’s own anthers to its stigma.

9. The bees collect the pollen from the Anther and then gives it the Stigma

10. Patrick as editor Miles as Researcher Madison as Researcher Aldrin as Artist Jonathan as Music producer/ Bee

11. SELF POLLINATION:  When the pollen grains are transferred from anther to the stigma of same flower or a different flower produced on the same plant is called Self Pollination. Self Pollination Autogamy Geitonogamy

12. A UTOGAMY It is a type of self pollination in which an intersexual or perfect flower is pollinated by its own pollen. Autogamy occurs by 2 methods : Homogamy :The anthers and stigmas of chasmogamous or open flowers are brought together by growth, bending or folding. Cleistogamy : In cleistogamous flowers, the anthers dehisce inside closed flowers. Growth of style brings the pollen grains in contact with stigma. Pollination and seed set are assured. Pollinators are not required.

13. CONTRIVENCE OR ADAPTAION FOR SELF POLLINATION MONOCLINY (Bisexuality) :- It means flowers are bisexual . Homogamy:- when both the sex organs of flower mature at the same time. Ex mirabilis Cleistogamy :-In some plants, flowers never open up and the anthers dehisce inside these closed flowers to ensure pollination. Thus, cleistogamous flowers are invariably autogamous as there is no chance of cross-pollination. These flowers produce assured seed sets even in the absence of pollinators, e.g., Oxalis

14. Autogamy:  When the pollen grains are transferred from anthers of a flower to the stigma of the same flower is called as Autogamy.  This takes place in bisexual flower.  It occurs by cleistogamy and homogamy.

15. Geitonogamy:  It is a kind of pollination in which the pollen from the anther of one flower are transferred to the stigma of other flower born on the same plant.  It occurs in plants with monoecious condition.  Eg- Maize

16. ADVANTAGES- The flowers do not depend on external agents. Minimum wastage of pollen grains. It maintains genetic purity. It is a sure process. Plants do not waste energy to produce special devices to attract agents for pollination. It is more economical method. DISADVANTAGES- New varieties can not be produced. Progeny becomes weaker due to lack of mutation . Seeds have poor viability. There are no possibilities of variation.