The aim was to explore the linear regression prediction models between sowing time and plant height, leaf stem ratio and DW/FW ratio of forage sorghum in autumn idle land. [Method] The relationships between sowing tim...The aim was to explore the linear regression prediction models between sowing time and plant height, leaf stem ratio and DW/FW ratio of forage sorghum in autumn idle land. [Method] The relationships between sowing time and plant height, leaf stem ratio and DW/FW ratio of forage sorghum were simulated and compared by employing field plot experiment and linear regression analysis. [Result] The sowing time had a great impact on plant height, leaf stem ratio and DW/FW ratio of forage sorghum in autumn idle land. With the delay of sowing time, the plant height and DW/FW ratio of forage sorghum decreased, while the leaf stem ratio increased. The regression models between sowing time and plant height, leaf stem ratio and DW/FW ratio of forage sorghum were established： plant height and sowing time, yheight = 234.725- 5.005X; leaf stem ratio and sowing time,ylcaf= 0.096 ＋ 0,019x; DW/FW ratio and sowing time, ydry= 0.305-0.002X. From July 23rd to August 30th, the plant height of forage sorghum was reduced by 5.005 cm, the leaf stem ratio was increased by 0.019 and the DW/FW ratio was reduced by 0.002 in average when hhe sowing time was delayed by one day. [Conclusion] This study provides a theoretical support for the production of forage sorghum in autumn idle land.展开更多
To study the relationship between the structures of rice and sorghum psbA 3 UTR and gene expres-sional activity, six chimeric luc genes that encode luciferase under control of rice or sorghum psbA 5 UTR and 3’UTR or ...To study the relationship between the structures of rice and sorghum psbA 3 UTR and gene expres-sional activity, six chimeric luc genes that encode luciferase under control of rice or sorghum psbA 5 UTR and 3’UTR or only 5 UTR were constructed. The levels of LUC accumulation in E . coli and the transcript stability in soluble pro-tein extracts of rice, sorghum chloroplast and E. coli were examined respectively, and a detailed analysis about the function of these two 3’UTR has been carried out. Here the regulation effect of these 3’UTR are reported: ( i ) When having the same promoter, the chimeric genes with rice 3 UTR produce LUC much more than that with sorghum 3 UTR; ( ii ) elimination of 3 UTR results in the fluctuation of LUC accumulation no matter whether it is under control of rice or sorghum psbA 5’UTR; ( Hi ) rice psbA 3’UTR exhibits a greater effect on stabilizing tran-scripts; ( IV ) psbA 3’lR-RNAs are more stable in chloroplast protein extracts than in E. coli protein extracts.展开更多
A late fall frost may significantly affect sugar crops’ stem sugar composition, yield and juice quality for biofuel and bioproduct manufacture. Research on the effects of late fall frost in sugarcane is well document...A late fall frost may significantly affect sugar crops’ stem sugar composition, yield and juice quality for biofuel and bioproduct manufacture. Research on the effects of late fall frost in sugarcane is well documented, but information is lacking for sweet sorghum. Three and six commercial cultivars of sugarcane and sweet sorghum, respectively, were selected and evaluated for exposure to a late fall frost (-2.8°C) in Griffin, Georgia, USA. Under the same controlled environmental conditions in a screen house, the late fall frost induced more damage to sugarcane than sweet sorghum stems. The frost caused damage to sugarcane tissue and for juice to exude from stems, whereas similar behavior was not observed for sweet sorghum. In both sugarcane and sweet sorghum, the glucose/fructose ratio was significantly reduced, but this change may not be totally directly related to the frost effect. Overall, these initial results suggest that sweet sorghum may have a better tolerance to fall frost than sugarcane. Two sweet sorghum cultivars, Grassl and M81E, responded well to the late fall frost, and they can possibly be used as feedstocks for biofuel/bioproduct manufacture in areas susceptible to frosts including northern regions of the Southeastern US.展开更多
文摘The aim was to explore the linear regression prediction models between sowing time and plant height, leaf stem ratio and DW/FW ratio of forage sorghum in autumn idle land. [Method] The relationships between sowing time and plant height, leaf stem ratio and DW/FW ratio of forage sorghum were simulated and compared by employing field plot experiment and linear regression analysis. [Result] The sowing time had a great impact on plant height, leaf stem ratio and DW/FW ratio of forage sorghum in autumn idle land. With the delay of sowing time, the plant height and DW/FW ratio of forage sorghum decreased, while the leaf stem ratio increased. The regression models between sowing time and plant height, leaf stem ratio and DW/FW ratio of forage sorghum were established： plant height and sowing time, yheight = 234.725- 5.005X; leaf stem ratio and sowing time,ylcaf= 0.096 ＋ 0,019x; DW/FW ratio and sowing time, ydry= 0.305-0.002X. From July 23rd to August 30th, the plant height of forage sorghum was reduced by 5.005 cm, the leaf stem ratio was increased by 0.019 and the DW/FW ratio was reduced by 0.002 in average when hhe sowing time was delayed by one day. [Conclusion] This study provides a theoretical support for the production of forage sorghum in autumn idle land.
基金Project supported by the Chinese National High-Tech Project.
文摘To study the relationship between the structures of rice and sorghum psbA 3 UTR and gene expres-sional activity, six chimeric luc genes that encode luciferase under control of rice or sorghum psbA 5 UTR and 3’UTR or only 5 UTR were constructed. The levels of LUC accumulation in E . coli and the transcript stability in soluble pro-tein extracts of rice, sorghum chloroplast and E. coli were examined respectively, and a detailed analysis about the function of these two 3’UTR has been carried out. Here the regulation effect of these 3’UTR are reported: ( i ) When having the same promoter, the chimeric genes with rice 3 UTR produce LUC much more than that with sorghum 3 UTR; ( ii ) elimination of 3 UTR results in the fluctuation of LUC accumulation no matter whether it is under control of rice or sorghum psbA 5’UTR; ( Hi ) rice psbA 3’UTR exhibits a greater effect on stabilizing tran-scripts; ( IV ) psbA 3’lR-RNAs are more stable in chloroplast protein extracts than in E. coli protein extracts.
文摘A late fall frost may significantly affect sugar crops’ stem sugar composition, yield and juice quality for biofuel and bioproduct manufacture. Research on the effects of late fall frost in sugarcane is well documented, but information is lacking for sweet sorghum. Three and six commercial cultivars of sugarcane and sweet sorghum, respectively, were selected and evaluated for exposure to a late fall frost (-2.8°C) in Griffin, Georgia, USA. Under the same controlled environmental conditions in a screen house, the late fall frost induced more damage to sugarcane than sweet sorghum stems. The frost caused damage to sugarcane tissue and for juice to exude from stems, whereas similar behavior was not observed for sweet sorghum. In both sugarcane and sweet sorghum, the glucose/fructose ratio was significantly reduced, but this change may not be totally directly related to the frost effect. Overall, these initial results suggest that sweet sorghum may have a better tolerance to fall frost than sugarcane. Two sweet sorghum cultivars, Grassl and M81E, responded well to the late fall frost, and they can possibly be used as feedstocks for biofuel/bioproduct manufacture in areas susceptible to frosts including northern regions of the Southeastern US.
