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Effects of Sucrose Concentration and Light Intensity on Growth and Photosynthesis of Ginger Plantlets in vitro(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2008 No.03
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Effects of Sucrose Concentration and Light Intensity on Growth and Photosynthesis of Ginger Plantlets in vitro
ZHOU Ming et al.
(College of Agronomy and Biotechnology, China Agriculture University, Beijing 100094, China)
Keywords ginger plantlet in vitro sucrose concentration light intensity growth photosynthesis

Abstract The growth and photosynthesis of ginger plantlets in vitro in response to the three different sucrose concentrations (0%, 1%, 3%) and three different photosynthetic photon fluxes (60, 120, 180 μmol m-2 s-1) were investigated. The results showed that as the sucrose concentration decreased, the growth of the plantlets of two cultivars (Henan Zhangliang and Sichuan Zhugen) was restrained, the chlorophyll and carotenoid content reduced, and the gross photosynthesis (Pg), net photosynthesis (Pn) and dark respiration rate (Rd) increased. Fv/Fm was the lowest at 3% sucrose concentration. When the light intensity was elevated from 60 μmolm-2 s-1 to 120 μmol m-2 s-1, the growth of the plantlets of the two cultivars was promoted. However, the growth was restrained when the light reached 180 μmol m-2 s-1. The chlorophyll content decreased as the light intensity increased. The Pn of Zhangliang ginger was greatest when cultured under the light intensity of 120 μmol m-2 s-1. The Pn of Zhugen ginger increased as the culture light intensity increased and reached 0.88 μmolm-2 s-1, the highest value when measured under 180 μmol m-2 s-1 light intensity. The Zhangliang ginger cultured under 180 μmol m-2 s-1 had a significantly lower Fv/Fm, showing that it had suffered photoinhibition. However, no differences were observed in the three treatments of Zhugen ginger. As the light intensity increased, the Rd increased in Zhangliang ginger, but no such difference was found in Zhugen ginger. Tab 6, Ref 22




Last Update: 2008-07-01