Micromanipulation and in vitro fertilization with single pollen grains of maize

Summary The manipulation of single pollen grains of maize was studied. The effects of delivering substances both locally to the grain wall, tube or tip by a microcapillary and directly into the pollen grain by microinjection, and single grain pollination were investigated. Germination was induced by adding small amounts of water locally to the grains with either a microcapillary or with a waterdelivering emulsion without any other ingredients in the medium. The grains were overlayered by mineral or silicone oil so that tube growth proceeded without the grains bursting. There was no apparent penetration of high-molecular-weight substances (FITC-dextran, ethidium bromide labelled DNA) into the living grain either before or after pollination. Neither could the penetration of these substances be detected in both dry, viable and hydrated grains, tubes and tube tips, with or without treatment with Triton X-100 and dimethyl sulfoxide. By microinjection, however, the delivery of high-molecular-weight substances into grains was possible. Such injected grains successfully pollinated stigmas of cultured ear segments. Pollination with pore-injected grains was most efficient (mean 26%). No difference in fertilization rates between mass pollination (mean 41%) and single grain pollination (mean 39%) could be found. A mean fertilization rate of 29% could be obtained after microinjection. Seedlings developed 3 weeks after being pollinated by means of the in vitro pollination and fertilization method.