Methods of modulating cytokinin related processes in a plant using B3 domain proteins

A method of delaying senescence, reducing stature, increasing the number of stems, or increasing biomass in a plant, the method comprising:

• (i) introducing into the plant a construct comprising a plant promoter operably linked to a heterologous polynucleotide, the heterologous polynucleotide encoding a B3 domain protein comprising an amino acid sequence with at least 95% identity to SEQ ID NO:15, and (ii) selecting a plant exhibiting, relative to a plant lacking the construct, a phenotype selected from the group consisting of delayed senescence, shorter stature, increased number of stems, and increased biomass.