Update file progagation_of_mutant_plants.md

assays/plant_propagation/protocols/progagation_of_mutant_plants.md

+## Propagation of *lwd1* mutant plants
+
+- plants were grown in LD conditions until maturity
+- seeds were harvested for each plant individually
+
+**Generations:**
+- T0 plants: regenerated plants from cell culture (embryo transformation), produce T1 seeds
+- T1 plants: genotyping for potential mutants, produce T2 seeds
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