Under Greenhouse Manufacturing Administration Studies on the Optimal Irradiation for Tea Seedlings

The photosynthesis,chlorophyll content and the growth traits of the clone tea seedling grown under different light conditions(8%,15%,35%,42%,50% and 75% ambient light) under the greenhouse were compared.The photosynthetic rate(Pn),maximum photosynthetic rate(Pnmax),apparent quantum yield(AQY) and new biomass reached their maximum values at 75% ambient light condition.The content of chlorophyll,death rate,specific leaf area(SLA) and leaf area ratio(LAR) decreased with the increase of light intensity,while the ratio of chlorophyll a/b,root emerging rate of the plant,traumatic tissue formation rate,root shoot ratio(R/S) and root mass ratio(RMR) increased as the light intensity increased.50% and 75% ambient light were beneficial for the fast seedling-breeding to increase the light transmissivity of the green house and improve the light intensity for the seedling in the tents during cloudy days.