Current studies indicate that positional information is related to certain kind of hormones, diffusible molecules or non-transcribed DNA and even molecule(s) localized in cell walls.

• 近些年的研究从细胞壁、激素、可扩散因子和非转录DNA等角度对这一问题进行了大量探索, 成为植物发育生物学的一个热点领域。