Types of parthenocarpy, Biology

Assignment Help:

Types of Parthenocarpy

Three types of Parthenocarpy are generally recognized:

  1. Genetical
  2. Environmental,
  3. Chemically-induced.

Genetical Parthenocarpy is observed in many species cultivated for their fruit. It arises due to mutations or hybridization. Generally parthenocarpic varieties have sterile pollen so that the pollination stimulus is available, but fertilization does not take place. As a result, a fruit is produced which has no seeds. The famous navel orange has arisen from a normal seeded Citrus variety through mutation in an axillary bud, which formed a branch bearing seedless fruits. Several cultivated varieties of grapes and cucumber have also resulted from bud mutations.

Environmental Parthenocarpy is the result of some environmental conditions such as frost or low temperature which interferes with the normal reproductive process. In tomato, for instance, cultivation under low temperature and high light intensity can induce Parthenocarpy. Under these conditions pollination is so poor that seeds are not produced but ovary is activated to form the fruit Induced Parthenocarpy involves treatment of the flowers with certain plant growth regulators. Auxins and gibberellins at low concentrations have been successfully utilized for induction of parthenocarpy in a large number of plants which otherwise bear seeded fruits. Seedless guava, tomato, and straw- fruits have been obtained by this method. Parthenocarpy is important in horticulture because seedless fruits are more convenient to consume and are particularly suitable for the industry manufacturing jams, jellies and fruit juices. Gibberellins also cause fruit enlargement (in grapes which are considered commercially beneficial for packaging and marketing, and also cause looseness of bunches).


Related Discussions:- Types of parthenocarpy

Do bacteria cells have a nucleus, Q. Do bacteria cells have a nucleus? ...

Q. Do bacteria cells have a nucleus? In bacteria the genetic material is dispersed in the cytosol and there is no inner membrane that delimits a nucleus.

Why is the determination of the blood types of the donor, Why is the determ...

Why is the determination of the blood types of the donor and of the recipient important in transfusions? The Red blood cells have different antigens in the outer surface of the

.ecology, Name three sources of biofuel

Name three sources of biofuel

Hydra, hydra has what symmetry......radial or biradial????

hydra has what symmetry......radial or biradial????

Preserving foods, One of man's oldest methods of preserving foods is drying...

One of man's oldest methods of preserving foods is drying or desiccation. The preservation of foods by drying is a direct result of removal of moisture. Microorganisms need water

Effect of a deletion in the operator of the lactose operon, Compare and con...

Compare and contrast the effect of a deletion in the operator of the lactose operon with one in the operator of the histidine operon.

What is the rh typing of the mother, What is the Rh typing of the mother an...

What is the Rh typing of the mother and of the fetus in the hemolytic disease of the newborn? In the hemolytic disease of the newborn the mother is Rh- and the fetus Rh+. In th

From which germ layer do blood cells originate, Q. From which germ layer do...

Q. From which germ layer do blood cells originate? What are other organs and tissues made from that germ layer? Blood cells have a mesodermal embryonic origin and other organs

Illustrate about sarcoplasmic reticulum membranes, An increase in the calci...

An increase in the calcium conductance of all sarcoplasmic reticulum membranes of a skeletal muscle with no external forces on it leads to A. Increased binding of calcium ions

What is the importance of surface area, A. How is the villus the functional...

A. How is the villus the functional unit of the small intestine? In your answer, include a discussion of its structure and function and the enzymes found there. What is the importa

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd