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《Acta Ecologica Sinica》 2004-04
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Effects of field light intensity and quality on biomass and salidroside content in roots of Rhodiola sachalinensis

YAN Xiu-Feng, WANG Yang, SHANG Xin-Hai~*, GUO Sheng-Lei, YU Tao(College of Life Sciences,Northeast Forestry University, Harbin 150040, China).  
Rhodiola sachalinensis A. Bor, a perennial herb, belonging to the family Crassulaceae, is mainly distributed at mountains of 1700~2500 m above sea level. It is a very important medicinal plant with high activities of anti-fatigue, anti-senescence and anti-radiation, due to the secondary product salidroside in its roots. Our previous research in a greenhouse has testified that shading can reduce biomass, salidroside content and yield in roots of Rh. sachalinensis , and shading with red film promotes salidroside content observably with a little negative effect on biomass, thereby results in a higher yield of salidroside in roots of Rh. sachalinensis . In the present paper, the effects of light intensity and light quality on plant growth and salidroside content in roots of Rh. sachalinensis in the field were investigated. Controlled experiments were performed on 3- and 4-year-old Rh. sachalinensis in 2001 at a nursery of Daxinganling Mountain (124°02′E, 50°30′N). Herbs were treated under red, blue and green films (relative light intensities were 51.76%, 26.96% and 24.80% of full sunlight, respectively), together with a control (CK) of no shading. All experiments started on May 8 and stopped on September 16, 2001 and Rh. sachalinensis roots were cropped on September. In treatment Ⅰ, Rh. sachalinensis plants were shaded by neutral cloth to achieve a same intensity as red-film-shading did during the experimental process. In Treatment Ⅱ, Red-film-shading was conducted all the time. In treatment Ⅲ, Ⅳ, Ⅴ or Ⅵ, plants were covered with neutral shading cloth from May 8, and then changed to red film on June 3, July 4, August 4 and September 2 (for 105, 74, 43 and 14 days of red-film-shading) respectively. In treatment Ⅶ or Ⅷ, blue- and green-film-shading were performed from the beginning to the end. In treatment Ⅸ, shading materials were shifted from neutral cloth to green film on September 2. Biomass and salidroside content were measured at the end of experiment, and salidroside yield (the product of salidroside content and biomass of root) was calculated. Shaded by neutral cloth positively affected salidroside content, but negatively did root biomass of 3- and 4-year-old Rh. sachalinensis (treatment Ⅰ) in the field, and synthetically resulted in a negative effect on salidroside yield in both 3- and 4-year-old Rh. sachalinensis with no significant difference to CK, which were similar to those results in a greenhouse. In the field, red film slightly decreased root biomass of 3- and 4-year-old Rh. sachalinensis (treatment Ⅱ, Ⅲ, Ⅳ, Ⅴ and Ⅵ) to their relative control of treatment Ⅰ, and a little severer biomass losses were showed while the treatment time prolonged. Similar to the results in a greenhouse, salidroside contents in roots of Rh. sachalinensis were improved significantly by red film, which were 57.13%~67.57% and 45.45%~55.27% higher than did neutral cloth in 3- and 4-year-old plants, respectively, and as a result, the enhancement of salidroside yields of 43.90%~73.02% in 3-year-old plants, and of 43.84%~47.46% in 4-year-old plants were observed. The difference among treatment Ⅱ~Ⅵ was of no significance which implied that the improvement of the accumulation of salidroside induced by red film did not depend on the spell of time, suggesting that we could treat Rh. sachalinensis plants under red film for a couple of days before harvest to yield more salidroside and less biomass losses. Long-term treatments (for 131 days) under blue and green films (treatment Ⅶ, Ⅷ) observably inhibited the growth of Rh. sachalinensis roots, whereas short-term treatment (14 days) with green film (treatment Ⅸ) affected root growth insignificantly. Though the results in a green house suggested that green film would also do favor to the production of salidroside in roots of Rh. sachalinensis as did red film, it did not show a corresponding result in the field. The content and yield of salidroside in roots of Rh. sachalinensis with short-term green light treatment were comparable to their control of treatment Ⅰ.
【Fund】: 国家自然科学基金资助项目 (3 970 0 0 13 )~~
【CateGory Index】: Q945
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