Studies On The Growth And Physiochemical Of Grape Seeding Under Enhanced Ultraviolet-B Radiation

Enhanced UV-B radiation resulting from ozone depletion, which caused activities human being, is one of the global environmental problems. Up to now, the effects of UV-B radiation on organisms have been studied extensively. But the targets studied were mostly concentrated on cultivated crops and specific eco-systems. The studies on fruit crops were few, and the conclusions of these studies were different. In this paper, the study on grape leaves of Cabernet Sauvignon was carried out under the enhanced of UV-B radiation with the intensities of 0μw·cm-2 (CK), 10.8μw·cm-2 (T1) and 25.6μw·cm-2 (T2) respectively. The duration of UV-B treatment were seven hours per day, and all plant were treated thirty days. The effects of UV-B radiation on the growth and physiochemical of grape were studied. The results were shown:1. Effect of enhanced UV-B radiation on grape growthUnder the enhanced UV-B radiation, the growth of Cabernet Sauvignon seedlings was inhibited. Leaves size smaller, section of node shorter, and grape tree become dwarf, which were proportion to the extent of cumulative radiation, and the tendency was T2>T1>CK; lower intensities promoted the near stem node to some extents less than CK.2. Effect of enhanced UV-B radiation on chlorophyllUnder the enhanced UV-B radiation, chlorophyll was affected in different level. In early stage of radiation, chlorophylla, b and total chlorophyll contents were reduced; in the sixth day, chlorophyll contents were reduced except chlorophylla in T1. With the accumulation of radiation, chlorophylla, chlorophyllb and total chlorophyll contents were gradually higher than CK; In the thirtieth day, compared with CK, the content of chlorophyllb in T2 were highly significant difference; and chlorophyllb in T1, chlorophylla and total chlorophyll in T2 were significant difference.3. Effect of enhanced UV-B radiation on UV absorbing compoundsUnder the enhanced UV-B radiation, contents of UV absorbing compounds and flavonoids were all more than CK, in the order T2>T1>CK. In the thirtieth day of handling...