The floral development of a critically endangered plant Euryodendron awelsum from Ternstroemioideae(Theaceae)has been observed under scanning electron microscope(SEM)for the first time.The flower of E.awelsum is bisex...The floral development of a critically endangered plant Euryodendron awelsum from Ternstroemioideae(Theaceae)has been observed under scanning electron microscope(SEM)for the first time.The flower of E.awelsum is bisexual and teleianthous.Five sepal primordia are initiated 2/5 spirally and arranged in one whorl when mature,and so are petals.Sepals and petals are initiated in the same order either clockwise or counterclockwise in the same flower.The androecial part is a ring pfimordium in the beginning.The in'st five stamen primordia are initiated on this ring primordium at antisepalous positions and then other stamen primordia appear on two sides of each of the first five pfimordia.Finally a total of 25 stamen primordia are initiated from the ring primordium and arranged in one whorl but could be grouped into 5 fascicles.Three sequentially initiated carpels compose an ovary which has an axile-central placenta with three locules and a truncate and indehiscent stigma.The floral development of E.awelsum is distinctly different from plants in Theoideae.展开更多
基金This workis funded bythe National Science Foundation of China(Grant No30560017)
文摘The floral development of a critically endangered plant Euryodendron awelsum from Ternstroemioideae(Theaceae)has been observed under scanning electron microscope(SEM)for the first time.The flower of E.awelsum is bisexual and teleianthous.Five sepal primordia are initiated 2/5 spirally and arranged in one whorl when mature,and so are petals.Sepals and petals are initiated in the same order either clockwise or counterclockwise in the same flower.The androecial part is a ring pfimordium in the beginning.The in'st five stamen primordia are initiated on this ring primordium at antisepalous positions and then other stamen primordia appear on two sides of each of the first five pfimordia.Finally a total of 25 stamen primordia are initiated from the ring primordium and arranged in one whorl but could be grouped into 5 fascicles.Three sequentially initiated carpels compose an ovary which has an axile-central placenta with three locules and a truncate and indehiscent stigma.The floral development of E.awelsum is distinctly different from plants in Theoideae.
