title: The effect of flowering time and distance between pollen source and recipient on maize.
abstract: Field experiments were conducted in Central Taiwan for 2 crop seasons to examine the effect of non-coincidence flowering on the cross-pollination (CP) rate of maize at various distances. Four local maize hybrid varieties with different flowering dates and one local maize variety were sown as the pollen sources and recipient, respectively. All varieties were sown on the same day to simulate the real situation of coexistence in which adjacent fields are sown with different genetically modified (GM) and non-GM varieties of maize. The CP rate was <0.2% at a distance of 3 m for the first crop season when the flowering time for the recipient was 5 d later than that of the pollen source variety. The CP rate was <0.02% at all distances for the second season when the flowering time for the recipient was 7 d later than that of the pollen source variety. The CP rate was <1% at a distance of 0.75 m when the flowering time was 3 d later. However, varieties with closer synchrony may result in a CP rate of >1% at a distance of 1.5 m and <1% at 2.25 m. Temporal separation and isolation distances can work together in Taiwan with fragmented landscapes to minimize the adventitious presence of one crop with another.
authors.affiliation: a Department of Agronomy ; National Chung Hsing University ; Taichung , Taiwan , R.O.C.
authors.forename: Shuo-Cheng
authors.initials: SC
authors.lastname: Nieh
authors.forename: Wen-Shin
authors.initials: WS
authors.lastname: Lin
authors.forename: Yung-Heng
authors.initials: YH
authors.lastname: Hsu
authors.forename: Guang-Jauh
authors.initials: GJ
authors.lastname: Shieh
authors.forename: Bo-Jein
authors.initials: BJ
authors.lastname: Kuo
mesh_terms: D018556:Crops, Agricultural; D035264:Flowers / Q000502:physiology*; D051456:Gene Flow; D017343:Genes, Plant; D030821:Plants, Genetically Modified; D054817:Pollination; D012621:Seasons; D013624:Taiwan; D013995:Time; D003313:Zea mays / Q000235:genetics* / Q000502:physiology
keywords: AVK, the average total kernel number per ear in the whole field; CP, cross-pollination; GM, genetically modified; cross-pollination; flowering time; maize; temporal separation; xenia effect