The correct option is
C okra
Infectious diseases in plants can be viral, bacterial or fungal and can result in 20-30% or sometimes even total crop loss.
Thus, producing high-yielding cultivated varieties of plants that are resistant to one or more diseases would immensely help in increasing crop production.
A plant's resistance to a particular pathogen is a function of its genetic composition and enables it to prevent the pathogen from establishing an infection.
Disease resistance in high-yielding cultivated crop varieties can be developed by conventional breeding.
Many wild plants that are genetically related to cultivated varieties possess the disease resistance genes but give a poor yield. The gene providing disease resistance to a wild variety can be introduced into a high yielding cultivated variety. The wild variety of plant (resistant to diseases) is artificially crossed with a high yielding variety (having poor resistance to diseases).
The progeny obtained from such a cross can be screened for the selection of the hybrids that exhibit a combination of the desired characters, i.e., high yield and disease resistance. The selected varieties are self-pollinated for several generations until they become pure lines. These newly developed varieties are evaluated by growing in the research fields and recording their performance under ideal fertiliser application, irrigation, and other crop management practices.
- One such variety of okra (Abelmoschus esculentus) developed is Parbhani Kranti which is both high yielding and resistant to diseases like yellow mosaic caused by yellow mosaic virus. Okra is also called bhindi.
Pusa Shubhra is a variety of cauliflower that is resistant to the bacterial diseases such as black rot and curl blight black rot.
Himgiri is a wheat variety that is resistant to fungal infections such as leaf and stripe rust and hill bunt.
Pusa Komal is a cowpea variety that is resistant to bacterial blight.
Pusa sadabahar is a variety of chilli that is resistant to chilli mosaic virus, tobacco mosaic virus and chilli leaf curl virus.