Abstract:

Using typical 16 chinese cabbage varieties in Zhejiang province as materials, the accumulation of nitrite, nitrate and the percentage of crude protein, total sugar were investigated under greenhouse condition; then we determine the parameters of absorption kinetics for NO3- in 4 different genotypes varieties in relation to nitrate accumulation. The result showed that significant difference exist in nitrate accumulation among 16 varieties which independent of nitrite, crude protein and total sugar, screening the high-quality and low-nitrate accumulator is feasible. SYM and LLY are high-nitrate accumulator while HGQ, XKF, XD and GHQ are low-nitrate accumulator. When grow in medium containing NO3- 5mM~20mM, the absorption of NO3- is significant higher in SYM than that in HGQ; The SYM posses higher absorption rate and affinity to NO3- than HGQ according to it’s high Vmax and low Km value. Our result made foundation of breeding for low-nitrate-accumulator.