In case of gametophytic incompatibility system, the self incompatibility phenotype of the pollen is determined by
Mechanistically, enzyme catalysis and lipid structure involves substrate affinity, transition state stabilization and phospholipid composition govern function. This validates haploid genotype of the pollen because it reflects catalytic efficiency and membrane organization, a pattern repeatedly demonstrated in biochemistry research.
Ref: Berg et al., Biochemistry, 9th Edition, Chapter 13, Metabolism and Bioenergetics, covers glycolysis, citric acid cycle, oxidative phosphorylation and NADH-linked reactions detailing biochemical principles.
