Nieh Shuo-Cheng, Lin Wen-Shin, Hsu Yung-Heng, Shieh Guang-Jauh, Kuo Bo-Jein
a Department of Agronomy ; National Chung Hsing University ; Taichung , Taiwan , R.O.C.
GM Crops Food. 2014;5(4):287-95. doi: 10.4161/21645698.2014.947805.
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.
在台湾中部进行了两个作物季的田间试验，以研究不同距离下花期不遇对玉米异花授粉（CP）率的影响。分别播种了四个花期不同的当地玉米杂交品种和一个当地玉米品种作为花粉源和受体。所有品种均在同一天播种，以模拟相邻田地播种不同转基因和非转基因玉米品种共存的实际情况。在第一个作物季，当受体花期比花粉源品种晚5天时，3米距离处的CP率<0.2%。在第二个作物季，当受体花期比花粉源品种晚7天时，所有距离处的CP率<0.02%。当花期晚3天时，0.75米距离处的CP率<1%。然而，花期同步性较高品种在1.5米距离处的CP率可能>1%，在2.25米距离处<1%。在台湾景观破碎化的情况下，花期错开和隔离距离可共同作用，以尽量减少一种作物偶然混入另一种作物的情况。
