作者机构:
[Zhong Qiu-ping; Xie Bi-xia; Wang Sen] Cent S Univ Forestry & Technol, Sch Resources & Environm, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Wang Sen] C;Cent S Univ Forestry & Technol, Sch Resources & Environm, Changsha 410004, Hunan, Peoples R China.
关键词:
peach gum;supernatant;rheological property
摘要:
The rheological properties in the supernatant of peach gum from Prunnus dulcis were discussed in order to provide more scientific technical parameters and references for developing peach gum as a kind of medicinal gum.The rheological properties in the supernatant of peach gum were comparatively studied in different material ratios,temperatures,shaking times,pH values and salinities.The results show that,1) the mathematical model of shear rate with material ratio and shear stress is Y=0.069X12+0.035X2 -1.174,R2=0.942;2) the mathematical model of shear rate with temperature and shear stress is Y=4.936X12+0.023 2X2-1.688,R2=0.937;3) the mathematical model of shear rate with shaking time and shear stress is Y=0.005 192 X13-0.140 73X12+1.249 045X1+ 0.036 546 X2-3.644 29,R2=0.954 3;4) the effects of pH value on the rheological properties in the supernatant of peach gum are comparatively complicated with a varying range of 3-11 and the shear rate shows a change trend of saddle model;5) the mathematical model of shear rate with the concentration of NaCl and shear stress is Y=-0.037 44X1+0.012 93 X2,R2=0.998;6) the mathematical model of shear rate with the concentration of CaCl2 and shear stress is Y=0.025 789X1+0.016 19X2,R2 =0.999;and 7) the mathematical model of shear rate with the concentration of sorbic acid potassium and shear stress is Y=0.079 5X1+0.017 3X2,R2=0.998.The results show that the material ratio,temperature,shaking time,pH value significantly affect the rheological properties in the supernatant of peach gum,and the concentrations of NaCl and CaCl2 also significantly affect the rheological properties expect the concentration of sorbic acid potassium.
摘要:
Maire Yew (Taxus mairei) is an important ornamental plant with anticancer properties. Since its natural resource is limited and reproduction is difficulty, both seed germination and stem cuttings were conducted under controlled environmental conditions. Different storage regime had significant effect on germination rate and seedling survival rate. Seeds stored under moisture-controlled sand had the highest germination and survival rates of 97.3 and 92%, respectively. The average seedling height was 36.6 cm and the highest plant was 48.0 cm. Seeds directly sowing in the field had germination rate of 39.7% and the survival rate of 38.8%. The average seedling height was 13.2 cm. Seeds of Maire Yew stored under the ambient conditions had detrimental effect and no germination was recorded. Media played an important role on rooting of stem cuttings. The highest rooting percentage, 78.0%, was observed from pure sand substrate and the lowest, 36.7%, was from red clay. The mixes of perlite and sand, vermiculite and sand yielded 42.7 and 59.3% of rooting. The best timing to collect stem cuttings of Maire Yew was late November, which led to the rooting percentage of 78.6%. Too early or too late will reduce the rooting percentage. Soft-wood stem cuttings around late June should be avoided. Both seed germination and stem cuttings could be applied for commercial production of Taxus mairei and further studies should focus on its germplasm resource and breeding.
作者机构:
[杜红岩; 杜兰英; 杨绍彬] Economic Forest Research and Development Center, CAF, Zhengzhou 450003 Henan, China;[乌云塔娜; 谢碧霞] Central South Forestry University, Zhuzhou 412006 Hunan, China
通讯机构:
[Du, L.-Y.] E;Economic Forest Research and Development Center, , Zhengzhou 450003 Henan, China