The Effect Of High Temperature On The Ultraweak Luminescence And Physiological Characters Of Chinese Cabbage

Three Chinese cabbage homogeneous parents including high-temperature tolerance breed A, mid- temperature tolerance breed C, low- temperature tolerance breed B were used as materials in the study. The changes of UWL and some relative physical characters during normal and high temperature resistance of Chinese cabbage seeding leaves was discussed, in order to offer theory thereunder for discuss high temperature enduring of Chinese cabbage parents and application of UWL on vegetable enduring breeding. The main results were as follows:1. Under normal temperature, the UWL intensity of seeding leaves was increased with the rise of culture time.2. Under high temperature stress, UWL intensity of seeding leaves increased at beginning and decreased later. Under different high temperature stress, the intensity of each seeing increased with the rise of temperature. When achieving at threshold value, UWL intensity of seeding began to weaken. The more decline of temperature, the more descending of UWL intensity. Different temperature tolerance breed had different changing range of UWL intensity. UWL intensity of high-temperature tolerance breed A was high and had low falling range, but low-temperature tolerance breed B have reverse trend, and mid-temperature breed C was between with the two others. There was a positive correlation between UWL intensity and temperature resistance of different breeds. The breeds fastness reflected by UWL was consistent with resulted by other physiological index. And the mensuration was easy, convenient, and delicacy.3. Under high temperature stress, the chlorophyll content of all three Chinese cabbage homogeneous parents fell, so leaded the decline of catching and using light ability of leaves. And the photosynthetic rate and apparent quantum yield of carbon assimilation depressed with prolong of high temperature stress and increase of temperature which had significant correlation with UWL. Relative to low-temperature tolerance breed, the Pn, AQY and light saturation point of...