Required for the proper distribution of nucleoids in chloroplasts. The nucleoid partitioning by YLMG1-1 may be related to chloroplast division processes. Localizes in punctate structures on the thylakoid membranes which are adjacent to a subset of nucleoids. Plant over-expressing YLMG1-1 have impaired chloroplast division leading to reduced number and enlarged chloroplasts in mesophyll cells. Plants silencing YLMG1-1 show a pale green phenotype in young emerging leaves and the basal part of expanding leaves. Belongs to the YggT family.