VERIFICATION OF BEHAVIOR OF VARIETIES OF PLUM TREES IN TERMS OF PHYSIOLOGICAL ASPECT
In the country there are many areas favorable to the plum species, and the Oltenia area has proved to be an area with particularly favorable climatic conditions. Leaves are the main organ in which photosynthesis, respiration, sweating processes take place. The intensity of the photosynthesis process is influenced by both internal and external factors. The variety and rootstock have a particular influence on the intensity of the photosynthesis process, especially the Miroval rootstock. The varieties that showed greater intensity of photosynthesis were Anna Spath, Diana.
The intensity of the respiration process varies depending on variety, rootstock, and phenophase. The plum Â Â Â varieties grafted on the Miroval rootstock recorded higher values of the respiration process.Â Chlorophyll content of the leaves varies with phenophase and the a/b chlorophyll ratio was higher in the phenophase of intense growth of shoots (CIL).The leaf carotenoid pigment had a mean value over the vegetation period ranging from 8.68 mg/100 g to the intense growth of shoots (CIL), 9.49 mg/100 g in the slowing down the growth of shoots (ICL) and 8.88 mg/100 g at the fruit ripening (IPF). In all three phenophases, there is a total content in pigments larger in the case of grafted varieties on the Miroval rootstock, followed by those on the Oteşani 8 and Pixy rootstocks