PJB-2019-695
METHODS ON CATEGORIZATION AND IDENTIFICATION OF BRASSICA GENOTYPES FOR HIGHER DRY MATTER, PHOSPHORUS ACCUMULATION AND UTILIZATION EFFICIENCY
Muhammad Irfan
Abstract
Development and introduction of new cultivars with higher phosphorus (P) efficiency is of paramount importance to uphold crop yields on low-P soil environments. Categorization of existing germplasm based on growth performance under P-deficiency is necessary for any program aiming to enhance P-efficiency. We categorized Brassica genotypes for dry matter (DM) production, P accumulation and utilization efficiency at two P levels (i.e. deficient, 20 µM Pi and adequate, 200 µM Pi) in a hydroponic experiment. Genotypes varied significantly for plant growth and biomass related attributes under both P levels. The genotypes Oscar and Con-III produced maximum DM and accumulated more P under deficient conditions and thus proved to be efficient, while genotypes R-75/1 and R-125/17 demonstrated lower values of these indices and were therefore, inefficient. Four methods were compared using different parameters/indices to categorize genotypes at both P levels. Some genotypes (i.e. Oscar, R-75/1, R-125/17, Con-I) maintained their status regarding P-efficiency when categorized by different methods, while other revealed variable results in response to adequate and/or deficient P level. Such genotypic differences explained the adaptation of genotypes under diverse P availability conditions and may provide the genetic basis for the execution of successful P-improving programs. Categorization of genotypes into three classes and their distribution into nine groups was the most excellent approach to distinguish minor differences among genotypes. Moreover, root DM, shoot DM, root-shoot ratio, total P uptake, and P utilization efficiency were important parameters taken into consideration while categorizing Brassica genotypes for P-efficiency.
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