Growth and Chlorophyll Fluorescence Characteristics of Different F_1 Bitter Gourds Under Low Temperature and Light

The growth and chlorophyll fluorescence characteristics of 4 F1 bitter gourds were studied under low temperature and low light intensity(day 15 ℃/night 7 ℃,80 μmol·m- 2·s- 1)along with control variety ‘Lujianbawang' . The results showed that under the low temperature and low light intensity,plant height,leaf number,leaf length and leaf width decreased obviously,the difference was significant among different F1' s. The chlorophyll fluorescence parameters Fo、Fv/Fm、ETR、Yield and qP were decreased with different degree,The chlorophyll fluorescence parameters qN was increased,the range of decreasing and increasing was different. Based on overall evaluation of the growth and the chlorophyll fluorescence characteristics,F1 varieties K3 and K4 had higher tolerance to low temperature and low light intensity,which could be important targets for breeding special variety for greenhouse production of bitter gourds.