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1. UV-irradiation and shade change the concentration of catalpol in Rehmannia glutinosa seedling and rhizosphere | |||
Zhang Peipei,Zhang Zhongtian,Gui Mengyuan,Wang Taixia | |||
Biology 25 June 2013 | |||
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Abstract:Research was conducted on Rehmannia glutinosa Libosch., a Chinese traditional medicinal plant, to investigate the effects of UV-irradiation and shade on the concentration of catalpol in seedlings and rhizosphere. The plants were grown under three irradiances: full light, partial shade (50% full light), and UV-irradiation. The R. glutinosa seedlings were harvested and the hydroponic culture solution in the containers was collected on day 3, 6, 9, 12, 15 after treatment respectively for determination of catalpol. The results showed that UV-irradiation increased the concentration of catalpol in leaves rapidly at the early stage, and then, instead of increasing, the concentration of catalpol decreased a little. In contrast, the catalpol content in R. glutinosa leaves was reduced under partial shade. Similar trends were observed in roots and stems of R. glutinosa under UV-irradiation and shade. The concentration of catapol in medium in which full-light, shade and UV-irradiated seedlings were grown all increased with time. But the concentration of catapol in medium of UV-irradiated seedlings was greater than that of full-light seedlings, and the concentration of catapol in medium of shade seedlings is lower. Therefore, UV-irradiation increased both production of catalpol in R. glutinosa seedlings, and secretion of catalpol into R. glutinosa rhizosphere. On the contrary shading decreased not only production of catalpol in R. glutinosa seedlings, but also secretion of catalpol into R. glutinosa rhizosphere. It was also found that UV-irradiation decreased the root vigor and partial shading increased the root vigor of R. glutinosa seedlings. | |||
TO cite this article:Zhang Peipei,Zhang Zhongtian,Gui Mengyuan, et al. UV-irradiation and shade change the concentration of catalpol in Rehmannia glutinosa seedling and rhizosphere[OL].[25 June 2013] http://en.paper.edu.cn/en_releasepaper/content/4548843 |
2. Different interactions between Cucumber mosaic virus and Tomato mosaic virus in tomato varieties | |||
Yixing Li,Guo Hong,Chen Shaoning,Chen Jishuang | |||
Biology 15 January 2010 | |||
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Abstract:Different interactions between CMV (Cucumber mosaic virus) and ToMV (Tomato mosaic virus) had been obtained in several tomato varieties. When tomato cv. Hezuo 903 plants were first inoculated with CMV-Fny, and then followed by a second inoculation with ToMV-N5 after 6-8 days, plants with co-infection expressed CMV-Fny-induced symptoms. The ToMV-N5-induced necrosis just localized on the inoculated leaves. Typical interference could be summarized for this phenomenon. Systemic necrosis induced by ToMV-N5 and interference between CMV-Fny and ToMV-N5 could occur in most tomato varieties (Hangza 1 and Zheza 809) except Zhongshu 4. They performed mild mosaic and synergism instead. The transcription of defense-related genes (PR-1a1 and PR-2) had been detected in tomato cv. Hezuo 903 plants among interference reaction. Results showed that two PR genes did not express in inoculated plants with mosaic and leaf deformation symptoms but was activated in ToMV-N5 infected plants with necrosis symptoms. It indicated that these two genes were effective with ToMV-N5 infection and could be interfered by pre-inoculation with CMV-Fny. Genotypes of resistance gene Tm2 in tomato cv. Zhongshu 4 and Hezuo 903 had been identified. Results revealed that two tomato varieties genotypes were both consistent with symptoms induced by ToMV-N5. It demonstrated that there may be a certain relationship between infection symptoms caused by ToMV-N5 on these two tomato varieties and genotype of Tm2. | |||
TO cite this article:Yixing Li,Guo Hong,Chen Shaoning, et al. Different interactions between Cucumber mosaic virus and Tomato mosaic virus in tomato varieties[OL].[15 January 2010] http://en.paper.edu.cn/en_releasepaper/content/39033 |
3. Changes in chloroplast ultrastructure, fatty acid components of thylakoid membrane and chlorophyll a fluorescence transient in flag leaves of a super-high-yield hybrid rice and its parents during the reproductive stage | |||
Mei-Ping Zhang,Guo-Xiang Chen | |||
Biology 14 January 2010 | |||
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Abstract:In plants, it is well established that chloroplast is one of the early targgeted organelles to break down during leaves senescing. Here we applied a newly-developed super-high-yield hybrid rice (Oryza sativa L.) LiangYouPeiJiu (LYPJ) and its parents lines to investigate changes in ultrastructure of chloroplasts, fatty acid composition of thylakoid membrane lipids and chlorophyll a fluorescence transient in natural senescing leaves. We found that at full expansion of flag leaves in three lines, chloroplasts often showed oblong shapes with a typical membrane system of stroma and grana thylakoids, whereas their shapes had been changed from oblong to spherical during senescence. Our data showed that the initiation of senescence displayed accumulation of starch and an increase in the number and size of plastoglobuli with the damaged thylakoid membranes; subsequently, swollen thylakoid membranes in stroma and in grana with a significant increase in MDA content, and disorganization of thylakoid membrane system with significant changes in fatty acid composition of thylakoid membrane lipids were developed. Compared with its parents, the newly-developed hybrid rice LYPJ had the highest capacity of carbohydrate transport from leaves (sources) to ears (sink), the lowest accumulation of starch grains in the leaf chloroplasts, and the slowest senescing rate of chloroplast in overall leaf senescence process. Chlorophyll a fluorescence transients of three kinds of flag leaves were analysed by so-called JIP-test. The results of analysis suggest that these findings inculding a high inherited activity of antioxidant enzymes and high photosynthetate transport to pretect chloroplast structure in the hybrid rice LYPJ have close relations to its super-high yield . | |||
TO cite this article:Mei-Ping Zhang,Guo-Xiang Chen. Changes in chloroplast ultrastructure, fatty acid components of thylakoid membrane and chlorophyll a fluorescence transient in flag leaves of a super-high-yield hybrid rice and its parents during the reproductive stage[OL].[14 January 2010] http://en.paper.edu.cn/en_releasepaper/content/38983 |
4. A Fibre-Assembling-Pressure Model for Developing Root Pressure | |||
Wang Xiaoen | |||
Biology 12 December 2008 | |||
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Abstract:For decades, it has well been known that the drive force of conducting both water and dissolved mineral ions from roots to leaves of plants makes mainly up of two: the pull of transpiration from leaves and root pressure. It had early been clear with regard to the transpiring pull, but mechanisms how root pressure be developed, hitherto, is fuzzy. Based on both experimental phenomenon of siphon-like transport of water defying gravity along fibre surface and crystallisation mechanisms, this paper theoretically suggests a fibre-assembling-pressure model for developing root pressure. According to the model, in roots the continuous polymerization of fiberized network, such as formation of nascent cell wall and maturity of xylem, can develop the fibre-assembling pressure, a positive hydraulic pressure. For a plant that grows with vigor, growth of all of fibres, such as xylem, can provide a drive force for water transport, division and expansion of cells in meristems, and gravitropic growth of roots. | |||
TO cite this article:Wang Xiaoen . A Fibre-Assembling-Pressure Model for Developing Root Pressure [OL].[12 December 2008] http://en.paper.edu.cn/en_releasepaper/content/26564 |
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