Cell polarity, asynchronous nuclear divisions, and bidirectional cytokinesis in male meiosis in Magnolia denudata

Ontogeny of Different Tetrad Types in the Single Microsporangium of Mitrephora tomentosa (Annonaceae)

“…Because pollen meiotic progression is mediated by microspores and tapetum expression [35,36], and the synthesis of callose is determined exclusively by tapetum [37], we speculated that the type of tetrad formed is co-regulated by sporophytic and gametophytic factors. Recently, Hu et al (2021) reported a new bidirectional callose deposition pattern in Magnoliaceae (Magnolia denudata Desr. ), where centripetally growing callose walls fused with a concurrent callose wall island in the center of the cell during cytokinesis [38].…”

“…Recently, Hu et al (2021) reported a new bidirectional callose deposition pattern in Magnoliaceae (Magnolia denudata Desr. ), where centripetally growing callose walls fused with a concurrent callose wall island in the center of the cell during cytokinesis [38]. This pattern was also later observed in Nymphaeaceae Salisb.…”

Meiotic behaviour and pollen fertility of F1, F2 and BC1 progenies of Iris dichotoma and I. domestica

“…Variations in pollen fertility are usually attributed to abnormal chromosome pairing and abnormal meiotic division (Yabuya, 1991). Abnormal meiosis, such as early chromosome migration, lagging chromosomes, bridge, unequal separation, micronuclei, multiple spindles, nonsynchronous division, unequal separation and so on, was observed in many plants, especially in interspecific hybrids (Wang et al, 2010;Hu et al, 2021). Compared with their parents, interspecific hybrids of Dendranthema had a higher frequency of chromosome bridges and lagging chromosomes (Cui et al, 2007).…”