设施繁育茶苗适宜光照强度研究

研究在不同光照条件下(光强分别为自然光的8%、15%、35%、42%、50%及75%)生长的茶树扦插苗的光合作用,叶绿素含量和生长情况。结果表明:茶树扦插苗的光合速率(Pn)、最大光合速率(Pnmax)、表观量子效率(AQY)均在自然光强的75%时达到最大值;叶绿素含量随光强的增加而降低,叶绿素a/b则随光强增加而增加;新生物量与最大光合速率一致,在自然光强的75%时达到最大值;其植株生根率、出现愈伤组织的比率、根条比及根生物量比(RMR)随光强的增加而增加,死亡率、SLA及LAR随光强的增加而降低。根据实验结果,适当提高大棚透光率及在阴天对大棚中的茶苗进行加光处理,对快速繁育茶苗有利。

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

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.