Zn对不同品种油菜光合特性、籽粒Zn含量的影响

为了探讨Zn对不同品种油菜光合特性、籽粒Zn含量的影响，采用盆栽试验比较了5种Zn浓度（0、1．0、5．0、10．0、20．0mg／kg）处理下5个油菜品种的生长、光合特性、籽粒zn含量及积累量的差异。结果表明，5个油菜品种的根、茎、叶、籽粒及植株干重、光合特性、Zn含量和积累量在品种之间、Zn处理浓度之间的差异显著，品种与zn浓度的交互效应也达到显著水平。当Zn_〈5．0mg／kg时，Zn增加了净光合速率（Pn）、气孔导度（G0以及蒸腾速率（日，提高了油菜茎、叶、籽粒及总干重。5个品种的籽粒zn积累量以及ENW、NTHYC和H33的籽粒zn含量随zn浓度先增加，在5．0mg／kg Zn时达到最大值，然后下降。ENW的籽粒Zn含量和籽粒Zn积累量在5．0mg／kg和10．0mg／kgZn处理时为5个品种最高或次高，分别为172．34mg／kg和164．10mg／kg、2．932mg／pot和2．575mg／pot。

The Effect of Zn on Physiological Characteristics and Grain Zn Concentration in Different Varieties of Rape

In order to study the influence of different Zinc （Zn） levels on physiological characteristics, Zn accumulation in grains of rape, the plant growth, physiological characteristics, concentration and accumulation of Zn in grain for five varieties （LPJCZ, ENW, SYKC, NTHYC and H33） were compared at Zn （0, 1.0, 5.0, 10.0, 20.0 mg/kg） treatments in pot experiments. The dry weights of roots, leaf, straw, grain and plant, physiological characteristics, concentration and accumulation of Zn significantly differed among different varieties and Zn levels. The activities of net photosynthetic rate （Po）, stomatal conductance （Gs）, transpiration rate （Z）, and dry weights of plant, straw, leaf and grain increased at Zn ≤ 5.0 mg/kg. Zinc concentration of roots, straw and leaf for five varieties, and grain Zn concentration for LPJCZ and SYKC increased by increasing of Zn, but grain Zn accumulation for five varieties, and grain Zn concentration for ENW, NTHYC and H33 increased at Zn ≤ 5.0 mg/kg, then decreased at Zn〉5.0 mg/kg. The high concentration and accumulation of Zn in grain were observed in ENW by 172.34 mg/kg （2.932 mg/pot） and 164.10 mg/kg （2.575 mg/pot） at 5.0 mg/kg and 10.0 mg/kg Zn treatments.