A novel flavonoid was isolated from the root of Macrothelypteris torresiana （Gaud.） Ching. The structure of the product was identified as 5, 7-dihydroxy-2-（1, 2-isopropyldioxy-4-oxocyclohex-5-enyl）-chromen-4-one o...A novel flavonoid was isolated from the root of Macrothelypteris torresiana （Gaud.） Ching. The structure of the product was identified as 5, 7-dihydroxy-2-（1, 2-isopropyldioxy-4-oxocyclohex-5-enyl）-chromen-4-one on the ground of chemical and spectro-scopic methods.2009 Jin Lan Ruan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
Two new flavanone glycosides 1 and 2 were isolated from the aerial parts of Macrothelypteris torresiana （Gaud.） Ching. The structures of two products were identified as （2S）-5,7,2＇,5＇-tetrahydroxyflavanone-2＇-O...Two new flavanone glycosides 1 and 2 were isolated from the aerial parts of Macrothelypteris torresiana （Gaud.） Ching. The structures of two products were identified as （2S）-5,7,2＇,5＇-tetrahydroxyflavanone-2＇-O-β-D-6＂-O-acetylglucopyranoside and （2S）- 5,7,2＇,5＇-tetrahydroxyflavanone-2＇-O-β-D-glucopyranoside on the basis of their chemical and spectral analysis, respectively.展开更多
Six male sterile lines (MSLs) of ramie (Boeh-meria nivea (L.) Gaud.) were grown in dark rooms under the photoperiods of 9.5h, 11h or 12.5h d-1 in spring and summer seasons (dif-ferent environmental temperatures) to te...Six male sterile lines (MSLs) of ramie (Boeh-meria nivea (L.) Gaud.) were grown in dark rooms under the photoperiods of 9.5h, 11h or 12.5h d-1 in spring and summer seasons (dif-ferent environmental temperatures) to test their developmental response to photoperiod and temperature. The MSLs showed little difference in vegetative growth duration, but different de-velopment rates in the reproductive growth stage under the tested conditions. Higher tem-perature (grown in summer) mainly accelerated vegetative growth, while the short photoperiod treatment accelerated the reproductive growth of the MSLs. Moreover, the short photoperiod treatment combined with higher temperature obviously accelerated both the vegetative and reproductive growth of the MSLs. But the effect of higher temperature decreased, or even dis-appeared along with the photoperiod elongation. The MSLs were divided into 5 photo-temperature response types, based on the flower budding acceleration of short pho-toperiod and the approximate temperature re-sponse index.展开更多
1 Antoni Gaudíwas sickly as a boy in Reus,Spain,often riding a donkey due to his weak legs.He loved art and nature and was full of ideas.As he grew older and stronger,Gaudíexplored the remains of many old bu...1 Antoni Gaudíwas sickly as a boy in Reus,Spain,often riding a donkey due to his weak legs.He loved art and nature and was full of ideas.As he grew older and stronger,Gaudíexplored the remains of many old buildings near his city,which made him realize what he wanted to do for the rest of his life.展开更多
对成花光敏感雌雄不育苎麻(floral initiation photoperiod-sensitive male and female sterile ramie,SMSFS)及其回复突变可育株SMSFS(R)叶片和花器官的可溶性糖和可溶性蛋白质含量进行了对比测定。结果表明:现蕾期SMSFS与SMSFS(R)叶...对成花光敏感雌雄不育苎麻(floral initiation photoperiod-sensitive male and female sterile ramie,SMSFS)及其回复突变可育株SMSFS(R)叶片和花器官的可溶性糖和可溶性蛋白质含量进行了对比测定。结果表明:现蕾期SMSFS与SMSFS(R)叶片的可溶性糖和可溶性蛋白质含量无明显差异,随着开花结实,SMSFS(R)的含量逐渐下降,至种子膨大期显著低于SMSFS的雌性败育期,而不育株叶片基本保持在现蕾期水平;从开花到败育期(或结实期),雌性花器官可溶性糖含量在2种材料中均下降且基本一致,但是SMSFS(R)开花时雄花可溶性糖含量显著上升并达到现蕾期的2倍,而SMSFS雄花败育时明显没有此变化;SMSFS(R)花器官可溶性蛋白质含量逐渐下降,而SMSFS有所升高,雌花败育期是SMSFS(R)结实期的2倍。展开更多
文摘A novel flavonoid was isolated from the root of Macrothelypteris torresiana （Gaud.） Ching. The structure of the product was identified as 5, 7-dihydroxy-2-（1, 2-isopropyldioxy-4-oxocyclohex-5-enyl）-chromen-4-one on the ground of chemical and spectro-scopic methods.2009 Jin Lan Ruan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
文摘Two new flavanone glycosides 1 and 2 were isolated from the aerial parts of Macrothelypteris torresiana （Gaud.） Ching. The structures of two products were identified as （2S）-5,7,2＇,5＇-tetrahydroxyflavanone-2＇-O-β-D-6＂-O-acetylglucopyranoside and （2S）- 5,7,2＇,5＇-tetrahydroxyflavanone-2＇-O-β-D-glucopyranoside on the basis of their chemical and spectral analysis, respectively.
文摘Six male sterile lines (MSLs) of ramie (Boeh-meria nivea (L.) Gaud.) were grown in dark rooms under the photoperiods of 9.5h, 11h or 12.5h d-1 in spring and summer seasons (dif-ferent environmental temperatures) to test their developmental response to photoperiod and temperature. The MSLs showed little difference in vegetative growth duration, but different de-velopment rates in the reproductive growth stage under the tested conditions. Higher tem-perature (grown in summer) mainly accelerated vegetative growth, while the short photoperiod treatment accelerated the reproductive growth of the MSLs. Moreover, the short photoperiod treatment combined with higher temperature obviously accelerated both the vegetative and reproductive growth of the MSLs. But the effect of higher temperature decreased, or even dis-appeared along with the photoperiod elongation. The MSLs were divided into 5 photo-temperature response types, based on the flower budding acceleration of short pho-toperiod and the approximate temperature re-sponse index.
文摘1 Antoni Gaudíwas sickly as a boy in Reus,Spain,often riding a donkey due to his weak legs.He loved art and nature and was full of ideas.As he grew older and stronger,Gaudíexplored the remains of many old buildings near his city,which made him realize what he wanted to do for the rest of his life.
基金National Natural Science Foundation of China(30270849),High-Tech Research and Development Program of China (2001AA241211) and Hunan Provincial Natural Science Foundation (04JJ3016)
文摘对成花光敏感雌雄不育苎麻(floral initiation photoperiod-sensitive male and female sterile ramie,SMSFS)及其回复突变可育株SMSFS(R)叶片和花器官的可溶性糖和可溶性蛋白质含量进行了对比测定。结果表明:现蕾期SMSFS与SMSFS(R)叶片的可溶性糖和可溶性蛋白质含量无明显差异,随着开花结实,SMSFS(R)的含量逐渐下降,至种子膨大期显著低于SMSFS的雌性败育期,而不育株叶片基本保持在现蕾期水平;从开花到败育期(或结实期),雌性花器官可溶性糖含量在2种材料中均下降且基本一致,但是SMSFS(R)开花时雄花可溶性糖含量显著上升并达到现蕾期的2倍,而SMSFS雄花败育时明显没有此变化;SMSFS(R)花器官可溶性蛋白质含量逐渐下降,而SMSFS有所升高,雌花败育期是SMSFS(R)结实期的2倍。
