Question

Pusa swarnim, a variety of Brassica , is resistant to?

Answer 1

Brassica is resistant to oomycetes namely Albugo candida being a relative variety of it. Mutation breeding is done basically to resist this plant.

Complete answer-
When we talk about resistance, it usually resists diseases by breeding. Breeding is carried out by the conventional breeding technique or by mutation breeding. Conventional method of breeding for disease resistance is that of hybridisation and selection. It helps for high yield.
The various steps are: screening germplasm for resistance, hybridisation of selected parents, selection and evaluation of hybrid and testing and release of new varieties.
Pusa swarnim (karan rai) variety of Brassica is resistant to disease white rust. The answer to this question is White rust. White rust is caused by oomycetes Albugo candida (close relative). This variety is resistant to disease due to breeding being performed.
The signs and symptoms of these include:
1. White blisters on the upper surface of the leaves.
2. Chlorosis on the surface of leaves.
3. Swelling up of the stem and roots of the plants.
This disease can cause problems in development of the host in sterility, deformation of the flower and twisting of the leaves. This problem is severe and might completely deteriorate the plants and lessens its productivity.

Note-
Mutation breeding is referred to as variation breeding, the process of exposing seeds to chemicals in order to generate mutants which we desire is done with the species. They are referred to as mutants. Plants are usually resistant to this disease because of this breeding only. It causes great loss in the fields of plants like cauliflower, mustard and many more. It causes abnormal growth, white blisters on leaves, swelling of roots. White blisters are released containing sporangia, which burst out of plant tissues. These blisters will penetrate and infect the host through stoma thus causing infections.