论文部分内容阅读
目的:研究遮荫对掌叶半夏生长、药材产量和光合生理指标的影响,分析适宜掌叶半夏药材高产的遮荫度,探寻其产量差异形成的光合生理机制。方法:采用遮荫网遮荫,共设置了5种光强处理,透光率分别为全光对照CK(100%)、T1(75%)、T2(65%)、T3(50%)、T4(25%),测定各遮荫处理下掌叶半夏的株高、单株叶片数、单株叶面积、单片叶面积、药材产量、叶绿素含量、光合日进程和叶绿素荧光参数。结果:(1)遮荫可显著(P<0.01)提高掌叶半夏的株高、单株叶面积和叶绿素含量;(2)光合日进程曲线测定结果表明,除T4处理外其他处理均发生光合“午休”现象,日平均光合速率(Pn)以T1处理最高,绝对光能利用率(Eu)以T3处理最高;(3)叶绿素荧光参数测定结果表明,CK的Fv/Fm最低,发生的原因可能与PSⅡ反应中心的光化学伤害有关;(4)药材产量以T2处理最高,较CK增产56.34%。结论:掌叶半夏更适宜在遮荫条件下栽培,透光率在65%时有利于掌叶半夏药材高产,其产量差异的形成可能与日均光合速率的不均衡有关。
OBJECTIVE: To study the effects of shading on the growth, medicinal material yield and photosynthetic characteristics of Pinellia ternata, analyze the shade degree suitable for the high yield of Pinellia ternata and explore its photosynthetic mechanism. Methods: Five types of light intensity treatments were set up using shading net shading. The light transmission rates were 100% for CK, 65% for T2, 50% for T3, T4 (25%). The plant height, number of leaves per plant, leaf area per plant, leaf area per plant, yield of medicinal herbs, chlorophyll content, daily photosynthetic rate and chlorophyll fluorescence parameters were measured under all shading treatments. The results showed that: (1) Shade significantly (P <0.01) increased the plant height, leaf area per plant and chlorophyll content of Pinellia ternata; (2) The curve of photosynthetic daily process showed that all treatments except T4 took photosynthesis The mean daily photosynthetic rate (Pn) of T1 was the highest, and the absolute light energy utilization (Eu) was the highest at T3. (3) The results of chlorophyll fluorescence parameters showed that the Fv / Fm of CK was the lowest The reason may be related to the photochemical damage of PSⅡ reaction center. (4) The yield of medicinal herbs is the highest in T2 treatment, 56.34% higher than CK. CONCLUSION: Pinellia ternata is more suitable for cultivation under shady conditions. When the light transmittance is 65%, it will be beneficial to the high yield of Chinese Pinellia ternata. The difference of yield may be related to the unbalance of daily average photosynthesis rate.