What Substances is usually the limiting amino acid in foods particularly those of plant origin?

In foods, particularly those of plant origin, the limiting amino acid is often lysine. Many plant-based proteins, such as grains and legumes, tend to have lower levels of lysine relative to other essential amino acids, which can limit protein synthesis in the body. Other common limiting amino acids in specific plant foods include methionine in legumes and threonine in some grains. To achieve a balanced amino acid profile, it's beneficial to combine different plant protein sources, such as rice and beans.