关键词: 扁穗牛鞭草, 抽穗, 开花, 花粉活力, 结实率

Abstract: The heading and inflorescencing morphology, pollen viability and seed bearing rate of two Limpograss cultivars were studi. Results show that Limpograss heads from the end of July to the first ten days of August, with heading lasting for 9 days of one inflorescence. Limpograss florets open only from 5 pm. to 7 pm., from top to bottom. One floret blooms in 47~86 minutes. The average population pollen viability (PV) of limpograss two cultivars are 24.0% and 16.2% respectively. The top floret PVs of same inflorescence are higher than those of bottom florets, with PVs of cv.the highest. Guangyica reachs 78.4% and cv. Chongqinalta 68.6%, and the PVs of No.8 floret or No.9 floret and those beneath them are zero. The seed bearing rates of limpograss cv.Guangyica and cv.Chongqinalta are 6.4% and 4.2% in sack pollination, 7.8% and 6.6% in open pollination.

Key words: LIMPOGRASS, HEADING, BLOOMING, POLLEN VIABILITY, SEED BEARING RATE