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DOI: 10.1055/s-0029-1186223
© Georg Thieme Verlag KG Stuttgart · New York
Sodium Bisulfite Improves Rhizome Yield and Quality in Paris polyphylla
Publikationsverlauf
received February 5, 2009
revised Sept. 2, 2009
accepted Sept. 23, 2009
Publikationsdatum:
20. Oktober 2009 (online)
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Abstract
Rhizomes of the perennial herb Paris polyphylla have been used in traditional Chinese medicine for hundreds of years. Agricultural production of the rhizomes requires 7–10 years, which is too long to meet the demand of the medicinal industry. Therefore, studies on improving the yield of the herb and shortening the culturing period are imperative. The present work aimed to investigate the effect of sodium bisulfite (NaHSO3) on rhizome yield and quality, as well as some related metabolic features of P. polyphylla. The rhizome yield was improved by NaHSO3 treatment in long-term experiments conducted during 2006 and 2007, with 2 mM NaHSO3 giving the highest yield. HPLC analysis revealed that NaHSO3 treatment increased the total saponin content (49 %), including three pennogenin glycosides and two diosgenin glycosides. In a short-term experiment, NaHSO3 treatment resulted in an enhanced net photosynthetic rate (Pn) for about 4 days without significant changes in the chlorophyll or carotenoid content. The total soluble sugars and sucrose contents in the leaves also significantly increased after 2 mM NaHSO3 treatment, whereas the starch content changed only slightly. The activities of the enzymes involved in ammonium assimilation (glutamine synthetase [GS] and glutamate dehydrogenase [GDH]) were not significantly influenced. In a long-term experiment, chlorophylls and carotenoids were not significantly affected, and neither was the starch content in leaves, but the total soluble sugars and sucrose contents in leaves increased significantly. The NaHSO3 treatment significantly increased GS and GDH activities. These results indicate that NaHSO3 treatment improved the rhizome yield in P. polyphylla, not only through enhancement of Pn but also by improving carbohydrate accumulation and ammonium assimilation. The increased saponin content after NaHSO3 treatment was indicative of high rhizome quality.
Key words
ammonium assimilation - Paris polyphylla - Trilliaceae - rhizome quality - rhizome yield - sodium bisulfite
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Jia-Ru Li
Key Laboratory of Ministry of Education for Plant Developmental Biology
College of Life Sciences
Wuhan University
430072 Wuhan
P. R. China
Telefon: + 86 27 68 75 35 99
Fax: + 86 27 68 75 20 95
eMail: jrli@whu.edu.cn
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