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1.
Ying Yong Sheng Tai Xue Bao ; 21(3): 619-23, 2010 Mar.
Article in Chinese | MEDLINE | ID: mdl-20560316

ABSTRACT

Taking the seedlings of Salvia miltiorrhiza cv. Sativa (SA) and S. miltiorrhiza cv. Silcestris (SI) as test materials, this paper studied the effects of drought stress on their leaf gas exchange and chlorophyll fluorescence parameters. After 15 days of drought stress, the net photosynthetic rate (P(n)) and the maximal photochemical efficiency of PS II (F(v)/F(m)) of SA were decreased by 66.42% and 10.98%, whereas those of SI were decreased by 29.32% and 5.47%, respectively, compared with the control, suggesting that drought stress had more obvious effects on the P(n) and F(v)/F(m) of SA than of SI. For SI, the reduction of P, under drought stress was mainly due to stomatal limitation; while for SA, it was mainly due to non-stomatal limitation. Drought led to a decrease of leaf stomatal conductance (G(s)), but induced the increase of water use efficiency (WUE), non-photochemical quenching coefficient (q(N)), and the ratio of photorespiration rate to net photosynthetic rate (P(r)/P(n)), resulting in the enhancement of drought resistance. The increment of WUE, q(N), and P(r)/P(n) was larger for SI than for SA, indicating that SI had a higher drought resistance capacity than SA.


Subject(s)
Carbon Dioxide/metabolism , Droughts , Photosystem II Protein Complex/metabolism , Salvia miltiorrhiza/physiology , Stress, Physiological , Photosynthesis/physiology , Plant Leaves/metabolism , Plant Leaves/physiology , Seedlings/physiology
2.
Zhong Yao Cai ; 31(9): 1299-301, 2008 Sep.
Article in Chinese | MEDLINE | ID: mdl-19180947

ABSTRACT

OBJECTIVE: To explore the technique of rapid propagation for Phytolacca americana. METHODS: Aseptic seedling were used as explants. RESULTS: The best explants were the stems from strong aseptic seedling. The optimal culture media were MS + NAA (0.2 mg/L) +6-BA (1.0 mg/L) for primarily culture, MS + NAA (0.2 mg/L) +6-BA (2.0 mg/L) for the induction of clustered shoots 1/2MS with NAA 0.4 mg/L for rooting. CONCLUSION: The propagating coefficient of Phytolacca americana can be improved by inducing the clustered shoots from aseptic seedling.


Subject(s)
Phytolacca americana/growth & development , Plants, Medicinal/growth & development , Tissue Culture Techniques/methods , Culture Media , Plant Growth Regulators/pharmacology , Plant Roots/growth & development , Plant Shoots/growth & development , Plant Stems/growth & development , Seeds/growth & development
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