Vol. 11, Issue 2 (2022)

Author(s):
A Aparna and Shiv Prakash Shrivastav

Abstract:
Self-Incompatibility (SI) is a mechanism in flowering plant species that prevents inbreeding and promotes outcrossing based on specific discrimination between self- and non-self-pollen, in order to induce variation. Heterosis occurs when two parents with diverse genetic backgrounds (pure lines) are crossed, so in terms of that SI definitely facilitate as outcrossing mechanism. Heterotic F₁ (Hybrid) show elevated yield as well as other agriculturally desirable traits in many crop species as a result of this extensive phenomenon hybrid vigour. It has been reported in about 70 angiosperm families including some important crop species. SI has two major classifications of heteromorphic and homomorphic self-incompatibility. In SI, male and female determinants i.e. S-determinants at the S-locus accomplish self/non-self-recognition. Modern studies using molecular biology, genetics, and biochemical approaches determined the classification of two different SI systems i.e. self-recognition and non-self-recognition. The Self-recognition system is present in the families; Brassicaceae and Papavaracea where interaction occurs between male and female determinants derived from the same S-halophytes. On the other hand, the non-Self recognition system is present in the Solanaceae family where the interaction occurs between male and female S-determinants derived from different S-halophytes.