Developmental constraints have been proposed to interfere with natural selection in limiting
the available set of potential adaptations. Whereas this concept has long been debated on …

The order Asparagales comprises 14 families, five of which occur in Brazil. Amaryllidaceae
is a family of economic relevance and includes numerous ornamental genera. The genus …

The embryology of the genus Hemerocallis L. was studied to re-evaluate its current
systematic position proposed by recent phylogenies based on molecular data. Using the …

Tetrad pollen ontogeny of Gardenia jasminoides was studied to explore potential insights for
the ontogeny of compound pollen and the evolution of pollen in Rubiaceae. Its …

Pollen grains are generally surrounded by an extremely resistant wall interrupted in places
by apertures that play a key role in reproduction; pollen tube growth is initiated at these sites …

Simultaneous microsporogenesis is described for the first time in a grass, Streptochaeta
spicata Schrad., a tropical Brazilian species that belongs in the early‐divergent subfamily …

A study of microsporogenesis (the earliest stage of pollen ontogeny) was undertaken in
seven cultivars of Codiaeum variegatum var. pictum, a eudicot species that produces …

The main features of microsporogenesis, or male meiosis (cytokinesis, intersporal wall
formation, and tetrad form), are described in 24 species of palms (Arecaceae). The species …

利用改良苯酚品红-苯胺蓝压片法, 观察小孢子母细胞减数分裂过程中胼胝质的动态变化.
使用该方法简便, 快速且省时, 获得的照片颜色鲜艳, 细胞质呈红色, 染色体为深红色 …

Abstract Background and Aims Microsporogenesis in monocots is often characterized by
successive cytokinesis with centrifugal cell plate formation. Pollen grains in monocots are …