Fig. 6: Proposed model of RIN1 function in regulating internode length and the potential utility of rin1 for high-density planting under long-day photoperiods.
From: Soybean reduced internode 1 determines internode length and improves grain yield at dense planting
RIN1 interacts with STF1 and STF2 and decrease STF protein abundance. This leads to down-regulation of GA2ox expression to promote internode elongation. While the truncation of WD40-repeat domain in rin1 weakens but does not eliminate the interaction with STF1 and STF2, and leads to an increase in STF abundance to directly up-regulate expression of GA2ox16. This results in a shortened internode. With increasing planting densities, yield of rin1 increases, thus demonstrating rin1 is an elite allele for dense-planting regimes typical of contemporary soybean-production systems.
