Carrageenan as an elicitor of induced secondary metabolites and its effects on various growth characters of chickpea and maize plants

The effects of polysaccharide elicitor k-carrageenan obtained from Hypnea musciformis, red algae on the production of Induced Secondary Metabolites, ISMs (the disease resistance compounds) and on various growth characters of chickpea and maize plants were studied. Experiments were conducted in the field of PCSIR Laboratories Complex Karachi during December 2008–April 2009 in randomized complete block design with three replications. Three elicitor treatments were used, a solid preparation in which the elicitor was mixed with soil (T₂ 1 mg/g) and applied around the seeds in the soil. The two other preparations were liquid, T₁ and T₃ at a concentration of 100 μg glc eq ml⁻¹ and were applied around the sowing seeds and as a foliar spray on the plants, respectively. Statistical analysis of the data revealed that these treatments significantly enhanced all the growth characters of chickpea except T₂ that gave the nonsignificant difference in the plant height. Maximum plant height (80.3 cm), number of pods plant⁻¹ (76.2), number of branches plant⁻¹ (25.0), number of leaves plant⁻¹ (125.6), earlier flowering and high ISMs contents in leaves, stem and grains of chickpea were recorded in T₁ treated chickpea plants. In maize plants only T₁ and T₃ treatments (with minor exceptions) had significant effects on few characters like plant height, stem diameter, number of leaves plant⁻¹ and on ISMs contents in leaves while number of cobs plant⁻¹ and flowering time were nonsignificantly affected by these treatments. These results suggested that k-carrageenan elicitor can be used as a potent plant protectant as well as growth promoting agent especially for chickpea plants.     

长枝沙菜Hypnea Charoides次级代谢物的分离与结构鉴定

对采自中国南海的红藻长枝沙菜 Hypnea Charoides的次级代谢物进行研究 ,从中分离得到 4个化合物 ,通过核磁共振、质谱等现代波谱分析技术确定其结构为 :豆甾 - 5 ,2 2 -二烯 - 3β-醇 - 3- o- β- D-吡喃葡萄糖甙 ( Ⅰ)、1 - o-十六碳酰基 -甘油酯 ( Ⅱ )、棕榈酸 ( Ⅲ )、正二十四烷 ( Ⅳ ) ,这些化学成分均首次从长枝沙菜中分离得到。     

长枝沙菜乙醇-乙酸乙酯溶出物的化学成分

海洋药物具有显著的药理稳定性和强效性,毒副作用相对较小,对防治癌症、艾滋病、心脑血管病、老年病等疑难杂症具有独特的作用,已成为开发新药、特效药的主要方向之一。长枝沙菜(Hyphea Charoides Lamx.)属红藻门沙菜科,其微量元素含量丰富。本文首次对长枝沙菜的化学成分进行了研究,从中分离得到神经酰胺和甾醇两类具有较强生理活性的物质。     

A Novel Lanostanoid Lactone From the Alga Hypnea cerricornis

A novel lanostanoid lactone (1) was first isolated from the Alga Hypnea cerricornis collected from the Xisha Islands in the South China Sea. The structure of 1 was determined on spectral evidence as 5α‐lansta‐8‐en‐3β, 22°‐dihydroxy‐22 (R), 24 (S)‐lactone.