Subjects: Biology >> Botany submitted time 2022-12-29 Cooperative journals: 《广西植物》
Abstract：
In order to find out the optimum harvest time of Polygala fallax, the present study analyze the root morphology, biomass, medicinal components, nutritional components and mineral elements of Polygala fallax roots during the 1~5 cultivating year by national standards and other methods. The results were as follows: (1) The morphology and biomass of Polygala fallax root increasd slowly during the first two cultivating year, and increased rapidly during the 2~3 cultivating year, however the parameters tended to be flat during the 3~5 cultivating year; (2) The content of different medicinal ingredients varied significantly within the cultivating year, polysaccharides reached to the peak at the first year, saponins reached to the peak in the second year, and flavonoids reached to the peak at the fourth year; (3) The mineral elements showed various behavior among cultivating years, the contents of Ca, Mg, Mn and Cu accumulated to the maximum in the third year, content of Fe decreased with increasing cultivating year, and the content of Pb increased with increasing cultivating year. (4) Crude protein increased first and then decreased, and the same change trands were observed in content of total ash and crude fat, both of which decreased as cultivating year increasing. The results show that Polygala fallax reaches a high yield in the third cultivating year, and most of the quality indicators in the roots of 4~5 year at the lowest value, and the third year is the ideal harvest period for Polygala fallax, which provide technical guidance for high-yield and good quality of Polygala fallax. The results of the study elucidate the dynamics accumulation of Polygala fallax during different cultivating year and reveal the optimal harvest time of Polygala fallax.
Subjects: Biology >> Botany >> Applied botany submitted time 2018-12-19 Cooperative journals: 《广西植物》
Abstract：锥栗C Castanea henryi Rehd. & Wils)是我国南方重要的木本粮食树种和特色果树资源，具有很高的食用及药用价值。为了探明最适宜锥栗种子萌发的条件，为锥栗种苗繁育提供理论基础，该试验以当年采收的锥栗种子为材料，研究了温度、光照、基质、基质含水量以及破壳处理等对锥栗种子萌发的影响。结果表明，锥栗种子萌发的最适温度是25℃，其最终萌发率为(92.672.67，在其它温度条件下，锥栗种子的萌发率有所下降，但与25 0C条件下的萌发率无显著差异;黑暗条件可缩短锥栗种子发芽时间，明显提高种子的萌发率和发芽势，但黑暗条件下的种子胚根长度显著小于周期性光照条件下的胚根长度;锥栗种子在泥炭土中的萌发率和发芽势均高于在河沙中的萌发率和发芽势，且泥炭土中种子胚根长度显著长于河沙中的种子胚根长度;基质含水量对锥栗种子萌发率和发芽势无显著性影响;种皮的机械阻碍是限制锥栗种子萌发的因素之一，破壳处理后，锥栗种子的萌发率明显提高，其发芽势和胚根长度与未破壳相比差异显著，实际生产中剪破种壳能加快种子的萌发进程。
Subjects: Biology >> Botany submitted time 2018-06-12 Cooperative journals: 《广西植物》
Abstract： 测定不同脱水程度金丝李（Garcinia paucinervis）种子的萌发情况及其复水后的吸水率、脱水过程中抗性生理指标的变化以及不同贮藏方式下种子的萌发情况，研究金丝李种子的脱水敏感性和储藏特性。结果显示：（1）金丝李种子初始含水量为45.29%，室温下放置35d失水率即达45%。（2）种子失水率低于18%时，萌发率和复水后的吸水率变化不显著；失水率超过18%时，萌发率和复水后吸水率均显著下降，失水率为42%时萌发率为0。其种子的临界含水量为27.29%，半致死含水量为12.72%。（3）随着种子脱水程度的加深，相对电导率、可溶性糖及脯氨酸含量逐步上升；丙二醛含量在失水率低于24%时变化不大，高于24%时显著提高；SOD和POD的活性均呈波动性变化，失水率为18%时活性均最高。（4）室温干藏1个月和-1℃、-20℃下湿藏1个月的种子均不能萌发；水浸贮藏1个月的种子萌发率显著降低；4℃湿藏1、3和6个月均显著延缓种子萌发，但对萌发率无显著影响。表明金丝李种子在失水率低于18%时，种子可通过抗性调节维持细胞的正常代谢，能忍受一定程度的脱水和低温，属于低度的顽拗性种子；当失水率超过18%时，种子代谢失衡发生劣变直至死亡。4℃湿沙藏（含水量7.5%）是短期贮藏其种子的较好方法。该研究为保育和利用珍稀濒危树种金丝李提供理论依据。
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