PD withdrawal process. (A–E) Nonpollinated PD withdraws slowly; (F–J) pollinated PD withdraws rapidly; (K) comparison of the withdrawal rates of non-pollinated and pollinated PDs. Mi, micropyle; O, ovule; P, pollen grains; PD, pollination drop. Scale bars: A–J = 200 μm.
Jin et al. BMC Plant Biology 2012 12:59 doi:10.1186/1471-2229-12-59