翻译下这段话：研究表明拟南芥中通过瞬时表达、ChIP-qPCR和emsa实验验证了VAL蛋白的B3结构域可以识别并结合SphRY 元件 CATGCA上发生H3K27me3组蛋白甲基化调控下游基因的转录

Research has shown that in Arabidopsis, the B3 domain of VAL protein is capable of recognizing and binding to the Sph/RY element (CATGCA) where H3K27me3 histone methylation occurs, as validated by transient expression, ChIP-qPCR, and emsa experiments, regulating the transcription of downstream genes.