Study on Biological Characteristics of Flowering and Pollination of Two Species of Syringa L.

The flowering habits and pollination characteristics of Syringa oblate and S.chinensis were studied.The floral oragans structure,flower shape,following sequence,flowering time,pollen viability and seed setting rate were observed.The results showed that the flowers of S.oblate and S.chinensis were bisexual flowers.S.oblate flowered one time a year,and flowering began in the first and middle ten-day of April,entered the full flowering stage in the early of May was,and ended in the late and middle ten-day of May.S.chinensis flowered two times a year,which flowered firstly from the late ten-day of April to the late ten-day of May,and secondly from the late ten-day of July to the early ten-day of September.The pollen viability of two species was relatively high,that of S.oblate decreased to 0 five days after storage,and that of S.chinensis was continued to the fifth days.The seed setting rate of natural pollination of the first flowering of S.chinensis was only 5.12%.The seed setting rates of natural pollination and self-pollination of the second flowering of S.chinensis were 0,while thoses of S.oblate were high.