同磷水平下甘蓝型油菜光合特性的基因型差异研究

采用盆栽土培试验研究了不同磷水平下甘蓝型油菜生长、磷吸收、叶片无机磷含量、光合生理参数的基因型差异，探讨了磷效率与光合作用和碳水化合物分配的关系。结果表明，低磷处理下甘蓝型油菜两个基因型叶片净光合速率、叶绿素含量、叶片蒸腾速率、胞间CO2浓度及气孔导度均显著下降; 由于磷参与了光合进程及光合产物的运输和代谢，磷高效基因型102具有较高的磷吸收效率，体内无机磷浓度较高，因此其光合作用强于磷低效基因型105，产生较多的碳水化合物运输到新叶。

Genotypic differences in photosynthetic characteristics in Brassica napus at different phosphorus levels

Aimed to understand the relation between phosphorus(P)efficiency and photosynthesis as well as carbohydrate distribution, the genotypic differences in growth, P accumulation, inorganic P(Pi)concentration of leaves and photosynthetic physiological parameters for Brassica napus P efficient genotype 102 and P inefficient genotype 105 were investigated using a pot experiment with three P levels(P15, P30 and P100). The results showed that photosynthesis parameters of two genotypes decreased significantly at low P levels(P15 and P30)in comparison with high P level(P100). Under low P treatment, P efficient genotype 102 had higher shoot dry matter and P accumulation. Consequently, the higher Pi concentration of leaves for genotype 102 promoted the photosynthesis and the translation of carbohydrates. Hence, photosynthesis became stronger and more carbohydrates were translated from old to young leaves compared to P inefficient genotype 105.