Abstract:To study the effects of cutting after grafted on nutrient uptake of wild vegetables, four rootstocks (Brassica pekinensis, Brassica napus, Raphanus sativus and Rorippa dubia) were used to graft Nasturtium officinale, and then cutting the seedlings of scions and planted in selenium (Se) contaminated soil. The nitrogen (N), phosphorus (P) and potassium (K) uptakes of N. officinale were investigated by the pot experiment. The rootstocks of B. pekinensis, B. napus, R. sativus, and R. dubia improved the N uptake ability of N. officinale in Se-contaminated soil, but reduce K uptake ability of that. The rootstocks of B. pekinensis, B. napus, and R. sativus increased the P contents in shoots of N. officinale, and the rootstock of R. dubia had on significant effects on that. Therefore, the rootstocks of B. pekinensis, B. napus, R. sativus, and R. dubia could significantly affect the N, P, and K uptake of N. officinale cutting seedlings after grafted, and the best rootstock was R. sativus in Se-contaminated soil.

An experiment was conducted to study the effect of different concentrations (20, 40, 60, 80, 100mg/kg) of gibberellin (GA3) on antioxidant enzymes of 'Hongdeng' sweet cherries. The results showed that POD, CAT and SOD activity decreased during the development of sweet cherry fruit;GA3 concentration of the processing of three kinds of enzyme activity were lower than control at the time of the fruit mature, especially the 60, 80, 100 mg/kg of GA3 treatment has lower antioxidant enzyme activity, accelerate the aging of the fruit. Therefore, it is suggested that the use of GA3 should be reduced in the actual production process, especially high-concentration GA3 spraying is unfavorable to fruit.

The effects of intercropping with two ecotypes of Galinsoga parviflora and their post-grafting generations on quality of Lactuca sativa were investigated through pot experiment under the cadmium stress. The results showed that the intercropping treatment had no significant effect on soluble sugar content in L. sativa, while intercropping with post-grafting generation of G. parviflora of mine ecotype as rootstock (MR) decreased the soluble protein content in L. sativa. For the Vc content of L. sativa, intercropping with G. parviflora of farmland ecotype (FCK) had the best effect on its promotion, while intercropping G. parviflora of mine ecotype (MCK) could effectively reduce the nitrate-N content of L. sativa leaves. As for the grafting method, the grafting combination of mine ecotypes are used as rootstocks and farmland ecotypes as scions is more effective, intercropping with its post-grafting generation under the cadmium stress had a better effect on the quality of L. sativa than on another grafting method.

The effects of intercropping with two ecotypes of Galinsoga parviflora and their post-grafting generations on nutrient uptake of Lactuca sativa were investigated through pot experiment under the cadmium stress. The results showed that intercropping with post-grafting generation of G. parviflora of farmland ecotype as rootstock (FR) had the best effect on increasing P content in L. sativa roots, while intercropping with post-grafting generation of G. parviflora of mine ecotype as scion (MS) could increase the P content in L. sativa shoots most effectively. The root content of K in the monoculture L. sativa was the highest, and the highest shoots K content was found in the L. sativa intercropping with G. parviflora of farmland ecotype (FCK). As far as the grafting method is concerned, intercropping with post-grafting generation of G. parviflora of mine ecotypes are used as scions and farmland ecotypes as rootstocks is more conducive to L. sativa nutrient uptake. Intercropping with MS can increase soil available N and K.