夏季遮荫对罗汉果生长和净光合速率的影响

Effect of Shading on Growth and Net Photosynthetic Rate of Siraitia grosvenorii in Summer

以引进的罗汉果为试材,研究了在自然高温条件下,不同程度遮荫处理(0%、20%、45%、70%)对罗汉果二级侧蔓的生长和净光合速率的影响。结果表明:70%遮荫处理的侧蔓长度和节间长度显著高于其它处理,而侧蔓直径、萌枝数、叶片及其栅栏组织的厚度、净光合速率均显著低于其它处理,有明显徒长现象而不适用于高温栽培管理;遮荫20%和45%的侧蔓长度、直径、萌枝数和净光合速率均显著高于对照,叶片及其栅栏组织厚度同对照无显著差异,是2个较理想的遮荫处理,而45%遮荫处理的侧蔓长度和叶片面积均显著大于20%遮荫处理,因此45%遮荫处理最为理想。

Taking introduced Siraitia grosvenorii as material, the growth of secondary lateral vine and the rate of net photosynthetic of Siraitia grosvenorii under different shading treatments（0%, 20%, 45% and 70%） were studied in natural high temperature. The results showed length of lateral vines and interknobs under 70% shading treatment was significantly higher than other shading treatments, but lateral vine diameter, new vine number, leaf thickness, palisade tissue thickness and net photosynthetic rate were significantly lower than other shading treatments. So 70~/4 shading treatment could not be applied to summer cultivation. The lateral vines＇ length and diameter, new vine number and net photosynthetic rate under 20% and 45% shading treatment were all significantly higher than 0~ shading treatment,and there was no significant difference in leaf thickness and palisade tissue thickness between the two treatments. It indicated 45 % and 20~//00 shading treatments were both better than full sunshine. Because lateral vines＇ length and leaf acreage were significantly higher under 450//oo shading treatment than 20% shading treatment,45 % shading treatment was the best one.