How artificial hybridisation help in introducing new varieties of plants?
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Answer:
Pollination is the process on which plants depend to transfer pollen grains from anther to stigma. It can be either cross-pollination or self-pollination, and their results vary. All pollinations will not lead to a successful fertilization because of a successful fertilization pistil of a flower has to recognize its right pollen of same species. In other words, pollen and stigma should be compatible. Incompatibility may lead to rejection of pollen. This situation is undesirable, especially in commercial crop production. Thus, artificial hybridization was developed.
Artificial Hybridization
As mentioned, pollen-stigma compatibility is essential for a successful pollination and fertilization. Once compatible pollen is accepted by pistil, events for fertilization proceeds, whereas incompatible pollen will be rejected. This interaction where a pistil is capable of recognizing its pollen is the result of long-term pollen-pistil interaction and chemicals released by pollen.
Understanding of pollen-pistil interaction is important in hybridization. It is one of the innovative methods of the crop production improvement program. During artificial hybridization, only the desired pollen grains are introduced to the stigma through pollination. This helps to avoid unwanted pollen rejection and saves time.
Hybridization proceeds in two steps, one is emasculation and another is bagging.
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