To understand the effects of different rootstocks on the growth of sweet cherry in greenhouse environment, The change of physiological and biochemical indexes of SUM variety grafted on dwarf stock (gisela 5) and the vigorous stock (mahaleb) was studied with biennial seedlings cultivated in greenhouse of north China. The results showed that dwarf stocks could increase content of Malonaldehyde (MDA), proline (PRO), activity of Superoxide dismutase (SOD) and decreased the membrane relative permeability in the leaves of SUM compared with vigorous rootstocks. So the dwarf stocks could increase the resistance of plants. The vigorous stock could decrease content of MDA, but the activity of Peroxidase (POD) was same in the leaves of SUM grafted on both of rootstocks. So, the dwarf rootstock should be better than vigorous stock on increasing resistance or drought and salt tolerance of the cherry varieties SUM.
In order to provide a theoretical basis for the development of the sweet cherry under the greenhouse environment in Tianjin area, the black cherry and the Sichuan cherry planted in greenhouses in north China were used to study the physiological and biochemical index under the different salt stress treatments (0, 0.2%, 0.4% and 0.6% ).The result showed that MDA content of Cerasus szechuanica was higher under salt stress; SOD activity of Cerasus szechuanica was almost the same to Cerasus maximowiczii (except under 0.6%Nacl); POD activity of Cerasus maximowiczii was higher under 0.4-0.6%Nacl concentration but lower under 0-0.2%; PRO content of Cerasus maximowiczii was higher under each salt stress but chlorophyll b content of Cerasus maximowiczii was lower under each salt stress.
In order to explore the effect of using two different afforestation tree species to improve soil in coastal saline-alkali land, the method of combining field sampling and indoor analysis and test was adopted. The physical and chemical properties of soils planted with Rhus typhina and Robinia pseudoacacia forest were determined. The results showed that afforestation could improve soil structure, decrease soil bulk density and increase soil fertility. To reduce soil salinization, the soil physical and chemical indexes of Robinia pseudoacacia plantation were better than those of growing Rhus typhina forest, so the planting area of Robinia pseudoacacia plantation in Dagang area could be increased. Planting Rhus typhina forest could also improve the soil in this area, but its effect was lower than planting Robinia pseudoacacia plantation.
In order to obtain the embryogenic callus of raspberry, the friable calluses of raspberry were used as materials to be treated by different time of starvation and desiccation, and were further cultivated and induced embryoid. By use of embryogenic observation, the embryogenic degree of callus could be determined. The results showed that the embryogenic degree of calluses which were treated by starvation for 6 days was the highest, and the desiccation treatment had no effect on embryogenic degree of calluses. Therefore, appropriate starvation treatment can facilitate the transformation of non-embryogenic callus into embryogenic callus. The results of this experiment could provide reference for callus embryogenesis induction of other plants.
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