Pollination ecology and breeding system of Impatiens lateristachys (Balsaminaceae) endemic to China
Pollination ecology and the breeding system of Impatiens lateristachys, a species endemic to the Emei Mountain were studied. The floral phenology,floral structure,pollen-ovule ratio(P/O),pollen viability,floral visitors and their behavior,and the breeding system were observed and determined. The flowering phase of the protandrous I. lateristachys lasted for a long time. The life span of an individual changed between the populations, but the female phase-male phase ratio was similar(0. 12-0. 17). The pollen/ovule ratio was 460 thousand,and pollen viability (MTT test)was at high level on the first day(>90 ％). The primary pollinators were Bombus festivus Smith and B.parthenius Richards;secondary pollinators were hawk moth;and B. grahami Frison was nectar gatherer. I lateristachys was a self-compatible species,its special floral structure and protandrous character could avoid selling and intrafloral male-female interference very well. The stigma movement of I. lateristachys was responsible for enhancing the function of the female. Fruit set was relatively low(26 ％ )under natural conditions, but hand-pollination increased the fruit set(42 ％). And the pollinator visitation rate(0. 2-2. 0)was significantly lower than that of other congeneric species(7. 1-8. 9),indicating that the fruit set may be limited by the shortage of pollinators.
国家科技期刊平台
NSTL
万方数据
维普
