Effects of shading on photosynthetic characteristics of Pinellia ternata leaves.
- Author:
Jian-Ping XUE
1
;
Xing WANG
;
Ai-Min ZHANG
;
Xun-Duan HUANG
;
Jia-Qing HE
;
Li CHANG
Author Information
- Publication Type:Journal Article
- MeSH: Chlorophyll; metabolism; Light; Photosynthesis; drug effects; Pinellia; metabolism; radiation effects; Plant Leaves; metabolism; radiation effects
- From: China Journal of Chinese Materia Medica 2008;33(24):2896-2900
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo study the effects of shading on photosynthetic physiology and chlorophyll fluorescence of Pinellia ternata.
METHODPlant 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.
RESULTThe 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.
CONCLUSIONCompared 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.
