Question

transfer of cytoplasm is done by recurrent selection

Answer 1

In this method two plants are selected and crossed and hybrid successively backcross to one of their parents. As a result the grain hybrid backcross progeny becomes increasingly similar to that of the parents to which it identical with the parent used for backcrossing. In this method the desirable variety which are lacking in some characteristics known as a recurrent or recipient parent, while the undesirable variety on wild variety processing only one or two desirable characteristics known as donor parent or non recurrent parent. The objectives of this method are to improve one or two specific defects of high yielding variety.

Answer 2

Male sterility in plants implies an inability to produce or to release functional pollen, and is the result of failure of formation or development of functional stamens, microspores or gametes. As a consequence male sterility is sometimes divided into:

• (a) ‘Pollen sterility’ in which male sterile individuals differ from normal only in the absence or extreme scarcity of functional pollen grains;
• (b) ‘Structural or staminal male sterility’ in which male flowers or stamens are malformed and non-functional or completely absent;
• (c) ‘Functional male sterility’ in which perfectly good and viable pollen is trapped in indehiscent anthers and thus prevented from functioning.

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