Iron Chlorosis Resistance

Iron chlorosis resistance refers to a plant's genetic capacity to maintain adequate iron uptake and utilization in high-pH or alkaline soil conditions, where iron naturally becomes less bioavailable. This trait is of particular relevance in cannabis cultivation, as iron chlorosis—characterized by yellowing of new growth despite adequate soil iron content—can significantly impact plant vigor and yield potential. The condition arises when soil pH exceeds optimal ranges (typically 6.0-7.0 for cannabis), causing iron to precipitate into forms roots cannot readily absorb. Breeders working in this category have identified genotypes showing improved iron acquisition efficiency through enhanced root exudation or chelation capacity. Iron chlorosis resistance is commonly associated with certain landrace and modern breeding lines developed for cultivation in calcareous or naturally alkaline regions

Plant breeders incorporate iron chlorosis resistance when developing cultivars intended for cultivation in alkaline soils or regions where pH management presents ongoing challenges. Selection for this trait reduces the need for intensive nutrient supplementation and iron chelate applications during growth cycles.