Xue Jian-Ping, Wang Xing, Zhang Ai-Min, Huang Xun-Duan, He Jia-Qing, Chang Li
Anhui Key Laboratory of Plant Resources and School of Life Science, Huaibei Coal Industry Teachers' College, Huaibei 235000, China.
Zhongguo Zhong Yao Za Zhi. 2008 Dec;33(24):2896-900.
To study the effects of shading on photosynthetic physiology and chlorophyll fluorescence of Pinellia ternata.
Plant growth, chlorophyll content, net photosynthetic rate (P(n)) and chlorophyll fluorescence in P. ternata were investigated under different shading treatments (0%, 70% and 90%) when it grew about 15 cm high.
The results showed that fresh weight of a tuber, height, leaf length, width, leaf area, specific leaf area (SLA) and contents of chlorophyll content were enhanced after shaded, and chlorophyll a/b rate declined. Compared with control, net photosynthetic rate, light compensation point (LCP) and light saturation point (LSP) of P. ternata decreased after shading, but apparent quantum yield (AQY) increased; quantum yield of PS II (PhiPS II), minimal fluorescence (F(o)), maximal fluorescence (F(m)), intrinsic photochemical efficiency of PS II (F(v)/F(m)) and photochemical quenching coefficient (qP) were enhanced.
Compared with control, all data indicated that there were distinctive differences between the height, SLA, chlorophyll content, P(n) and chlorophyll fluorescence characteristics under the shading treatments (70% and 90%), the fresh weight of a tuber increased after 70% shading, and provided better environmental conditions for the growth of P. ternata.
研究遮荫对半夏光合生理及叶绿素荧光的影响。
在半夏生长至约15厘米高时，对其进行不同遮荫处理（0%、70%和90%），测定其植株生长、叶绿素含量、净光合速率（P(n)）及叶绿素荧光。
结果表明，遮荫后半夏块茎鲜重、株高、叶长、叶宽、叶面积、比叶面积（SLA）及叶绿素含量均增加，叶绿素a/b比值下降。与对照相比，遮荫后半夏的净光合速率、光补偿点（LCP）和光饱和点（LSP）降低，但表观量子产率（AQY）增加；PS II量子产率（PhiPS II）、最小荧光（F(o)）、最大荧光（F(m)）、PS II的固有光化学效率（F(v)/F(m)）和光化学猝灭系数（qP）均增强。
与对照相比，所有数据表明，70%和90%遮荫处理下半夏在株高、SLA、叶绿素含量、P(n)及叶绿素荧光特性方面存在显著差异，70%遮荫后半夏块茎鲜重增加，为半夏生长提供了较好的环境条件。
