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Changes in endogenous gibberellic acid (GA) levels were determined in developing seeds and pods of pigeon pea (Cajanus cajan). Antibodies against GA3 were raised in rabbits and indirect ELISA developed to estimate GA level. Two varieties, black seeded variety (V1) and B.D.N2 (V2), were selected on the basis of their seed index value. The pod length and number of seeds per pod were significantly different for the two varieties. Dry weight, water content (WC), rate of water accumulation, rate of dry matter accumulation (DMA), and GA content in pod and seed were all larger in V1 than in V2. In both varieties, higher GA content was observed during cell elongation and DMA phases, respective to their varietal differences in growth traits. Relationships between WC and rate of DMA, and WC and GA differed significantly between the two varieties. The results suggest a role of GA and WC in sink-size development in both varieties studied. Foram estudadas alterações nos níveis endógenos do ácido giberélico (GA) em sementes e vagens em desenvolvimento de feijão-guandu (Cajanus cajan). Anticorpos contra GA3 foram obtidos a partir de coelhos; um método de ELISA indireto foi desenvolvido para estimar o nível endógeno de GA. Duas variedades, variedade de semente preta (V1) e B.D.N2 (V2), foram selecionadas tendo-se por base seus valores de índice de número de sementes. O comprimento da vagem e o número de sementes por vagem foram significativamente diferentes nas duas variedades. A massa seca, o conteúdo de água (CA), a taxa de acúmulo de água, a taxa de acúmulo de massa seca (AMS) e o conteúdo de GA nas sementes e nas vagens foram maiores em V1 que em V2. Em ambas as variedades, maiores conteúdos de GA foram observadas durante as fases de elongação celular e AMS, em conformidade com as diferenças de crescimento entre as duas variedades. Relações entre CA, taxa de AMS, CA e GA diferiram significativamente entre as duas variedades. Os resultados sugerem que GA e CA são importantes para o desenvolvimento do tamanho do dreno nas duas variedades estudadas

Relationship between gibberellic acid and growth parameters in developing seed and pod of pigeon pea