花粉外膜のパターン形成と層構造の相同性  [in Japanese] Exine pattern formation and homology in exine stratification of pollen  [in Japanese]

Previous studies on exine development of pollen are reviewed, with special attention being paid to homologies in exine stratification. The primexine scheme is criticized and a new model of exine pattern determination involving invagination of the plasma membrane is proposed. Supratectal elements are formed during the free microspore stage ; the supratectal elements should be regarded as different from the tectum, the pattern of which is formed during the tetrad stage. Other exine development patterns are also shown ; omniaperturate pollen and columellaless exine are also discussed in this review.