光质、光周期对白桦愈伤组织生长和三萜质量分数的影响

以白桦(Betula platyphylla Suk.)组培苗茎段为研究材料,在IS培养基上附加0.6mg/L NAA+0.8mg/L BA进行愈伤组织的诱导,观察不同光处理条件下白桦愈伤组织的生长状况及其三萜积累的变化.结果表明:在一个继代生长期中,白桦愈伤组织在不同光照条件下的干质量积累呈上升趋势,其干质量增长率依次为:蓝光(48.95%)＞黄光(40.24%)＞绿光(23.28%)＞黑暗(21.14%)＞红光(18.37%);全光照(36.56%)＞14h光照(24.69%)＞黑暗(21.14%).白桦愈伤组织的细胞活力在一个继代培养周期中呈现先上升后下降趋势,其中,愈伤组织的细胞活力在9～15d间达到最高值;白桦愈伤组织中三萜质量分数在0～9d呈上升趋势,9～18d呈下降趋势,18～21d略微回升,于第9d达到最大值.在第9d时,光处理下白桦愈伤组织中的三萜质量分数与对照(黑暗)相比的增长率依次为:蓝光(20.12%)＞红光(17.03%)＞黄光(9.35%)＞绿光(-3.09%);14h光照(12.06%)＞全光照(-3.01%).由此可见,光处理可以调节白桦愈伤组织的生长状态及其三萜等次生代谢物的积累量.

Effects of Light on Growth and Triterpenes Content in Callus of Betula platyphylla

The stems of tissue-cultured seeding of birch(Betula platyphylla Suk.) were cultured on IS media supplemented with 0.8mg/L BA and 0.6mg/L NAA to induce callus.The induced calluses were used to detect the rate of increased dry weight,cell viability and triterpenes content under different light conditions.During one subculture period,the rate of increased dry weight in callus under different light conditions exhibited blue light(48.95%)> yellow light(40.24%)> green light(23.28%)> dark(21.14%)> red light(18.37...