Discontinuities in the callose wall, intermeiocyte connections, and cytomixis in angiosperm meiocytes

摘要

Discontinuities, considered to be holes, were observed in the meiocyte callose wall of 25 dicotyledon and 5 monocotyledon taxa investigated by phase-contrast and Nomarski interference-contrast optics. With the exception of theHelianthusspp., where regular distribution was observed, the holes were confined to two to four discrete areas of the callose wall. Hole size was highly variable; the largest, of about 2ensp;mu;m diameter, occurred in lupin (Lupinus polyphyllusLdl.). Cytoplasmic connections between neighboring meiocytes and (or) cytomictic phenomena were observed in 13 of the 30 taxa investigated.