Comparative floral ontogeny of single-flowered and double-flowered phenotypes of Alcea rosea (Malvaceae)

摘要: A comparative study of floral ontogeny in single- and double-flowered Alcea rosea L. was conducted using epi-illumination light microscopy. In both types, differentiation starts with the appearance three epicalyx lobes, which subsequently subdivide to produce a 7–10-parted epicalyx. Five sepals appear then unidirectional or possibly spiral sequence. single flowers, corolla-androecium common primordium is formed differentiated into five androecial sectors (= primary primordia). Petals are developed at base secondary primordia initiated centrifugally two rows on each sector. Later, tertiary by subdivision primordia, differentiate units. Three types double flowers were identified regarding development. The first type shows more less disorganised nature. However, 10 proliferation zones can be indentified proximal distal tips sectors. second third development follows similar developmental pathways that flowers. second-type petals stamens develop from free space between primordia. third-type after complete primordial partitioning, some marginal parts sector petaloids intermediate appendages. gynoecium appears similarly as numerous congenitally united carpel phenotypes fit criteria for homoheterotopy partial replacement petals, well neoheterotopy, formation new position. Based mutant phenotypes, it suggested different functions contribute