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This experiment was conducted to evaluate pollen viability of Nakdongbyeo, transgenic rice lines, an F1 hybrid from a cross between Milyang weedy rice and ABC-promoter transgenic rice line containing basta-resistant (bar) gene and subsequent selfed progenies, F₂ and F₃. The reaction of pollen with 3-{4,5 dimethylthiazolyl-2}-2,5-diphenyl monotetrazolium bromide (MTT) as a staining chemical immediately after pollen shedding showed maximum pollen viability of 86% in Nakdongbeyo, 75% in ABC-promoter transgenic rice line, 62% in ubiquitin-promoter transgenic line, 68% in F1, 79% in F₂ and 78% in F₃. Viability gradually declined during subsequent observations at 20-minute intervals. However, there was a drastic decline in pollen viability after 40 minutes of pollen shedding. The mean difference of pollen viability among rice lines and time was highly significant, indicating significantly different pollen viabilities at different time intervals. Maximum viability of 36.2% was observed in F₃ and minimum viability of 3.5% was found in F₂ at 90 min after pollen shedding. Results of this experiment on pollen viability and longevity elucidate potential risks of pollen-mediated flow of herbicide-resistant gene from transgenic rice lines and possible integration of it into the weedy rice population.

saengmyeong gwahag hoeji/saengmyeong gwahak hoeji

Evaluation of Pollen Viability of Nakdongbyeo, Two Transgenic Rice Lines, Its Hybrids with Weedy Rice, and Subsequent Selfed Progenies: F<sub>2</sub>and F<sub>3</sub>

Evaluation of Pollen Viability of Nakdongbyeo, Two Transgenic Rice Lines, Its Hybrids with Weedy Rice, and Subsequent Selfed Progenies: F2and F3

Evaluation of Pollen Viability of Nakdongbyeo, Two Transgenic Rice Lines, Its Hybrids with Weedy Rice, and Subsequent Selfed Progenies: F₂and F₃