Floral biology, breeding system and pollination ecology of an endangered tree Tetracentron sinense Oliv. (Trochodendraceae)

Botanical Studies

Table 1 The pollen viability and stigma receptivity of T. sinense

Developmental stage of flower	Pollen viability/%	Stigma receptivity
Sepal opening	32.65 ± 1.91	++/--
Stigma reflexing	30.63 ± 1.70	+++/-
Stamens on the right and left of flower elongating	36.44 ± 2.71	+++/-
Dehiscence of anthers on the right and left	62.47 ± 1.89	++++
Stamens on the upper and lower of flower elongating	55.35 ± 2.64	+++/-
Dehiscence of anthers on the upper and lower	47.02 ± 2.32	++/- -

Note: '++++’ showing the stigma receptivity is the highest; '+++/-’ showing the receptivity of some stigmas is stronger and another is weaker; '++/--’ showing some stigmas have receptivity while another have no receptivity.