The Risk Assessment of Potential Weediness of Gene Stacked Rice B2A68 in Nanjing Area
The Risk Assessment of Potential Weediness of Gene Stacked Rice B2A68 in Nanjing Area
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作者：
Huang Ya
为评价基因堆叠水稻B2A68发生杂草的潜在生态风险，以抗草铵膦转基因抗虫耐草铵膦水稻B2A68与耐草铵膦水稻Bar-68和常规水稻宁粳46（CR）为对照，在田间对其存活繁殖能力、种子碎粒率、种子发芽率和种子活力进行了研究。无论生长在适宜季节还是不利季节，B2A68的生存和繁殖能力与直播和移栽的Bar-68没有显著差异，且B2A68对CR的竞争能力没有增强。B2A68的碎种率与Bar-68相似，两者的碎种率均高于CR，但三个水稻品种的碎种率基本相同。在试验田没有发现自愿种植的植物。3个水稻品种在播种后7天或移栽前的发芽率均在90%以上。3个水稻品种的种子活力随埋深和埋浅时间的延长而降低；B2A68和Bar-68的种子活力下降速度快于CR，表明南京地区B2A68的潜在杂草性较低。
To evaluate potential ecological risk of weediness for gene stacked rice B2A68,the survival and reproduction ability,seed shattering,seed germination rate,and seed viability of the transgenic insect-resistant and glufosinate-tolerant rice B2A68 was studied in the field in comparison to glufosinate-tolerant rice Bar-68 and conventional rice Ningjing46( CR). Regardless of being grown in the appropriate season and in an unfavorable season,the survival and reproduction ability of B2A68 was no significantly different to that of Bar-68 under direct seeding or transplanting,and B2A68 did not have increased competitive ability over CR. Seed shattering of B2A68 was similar to that of Bar-68,both of them shatter more seed than that CR but the shattering of the three rice varieties were at a same level. No volunteer plants were found in the experimental field. The three rice varieties had similar germination rates above 90% at 7 days after sowing or before transplanting. Seed viability of three rice varieties decreased with time under shallow or deep burial; seed viability of B2A68 and Bar-68 decreased faster than that of CR. It is concluded that the potential weediness of B2A68 was low in Nanjing,China.