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采用水培试验方法,从水稻移栽至某特定生育期之间添加外源镉(Cd),通过递推减法,研究了湘晚籼13号水稻不同生育期Cd胁迫对其生长和不同部位中Cd含量的影响.结果表明,50μg·L~(-1)外源Cd胁迫不会影响水稻的正常生长发育,糙米中的Cd主要来源于水稻分蘖期吸收的Cd在后期的迁移、灌浆期吸收的Cd和成熟期吸收的Cd,这3个关键生育期对糙米中最终Cd含量的贡献率分别为36.4%、18.2%和16.4%.因此,与灌浆期和成熟期相比,在水稻分蘖期采用一些植物阻隔技术可能对水稻籽粒中Cd含量的削减更为重要.
Using the hydroponic culture method, exogenous cadmium (Cd) was added from transplanting rice to a specific growth period. The effects of Cd stress at different growth stages of Xiangshenxian 13 on the growth and location The results showed that 50 μg · L -1 Cd stress did not affect the normal growth and development of rice. Cd in brown rice mainly came from the migration of Cd absorbed at the tillering stage of rice, Cd and Cd uptake during maturity were 36.4%, 18.2% and 16.4%, respectively, in the three key growth stages of rice. Therefore, compared with the grain filling and maturity stages, The use of some plant barrier technology may be more important for the reduction of Cd in rice grains.