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- 저자 : Zhang Pengying (검색결과 2 건)
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Pengying Zhang,Kaoshan Chen 한국식물학회 2009 Journal of Plant Biology Vol.52 No.4
We investigated variations in the level and composition of volatiles emitted by tomato leaves at different ages. Our focus also included their antifungal properties and responses to chitosan oligosaccharide. Based on leaf position, the release of volatiles decreased over time. Young leaves produced high levels of C6-aldehyde, which is mainly composed of hexenal, while the volatiles emitted by more mature leaves largely comprised terpenes, particularly β-phellandrene and caryophyllane. In young upper leaves, the main components (up to 86% of the total) were hexenal, β-phellandrene, and caryophyllane. Their levels decreased steadily over time, from 386.3 μg g−1 fresh weight (FW) in young leaves to 113.2 μg g−1 FW in old tissues. Volatiles emitted from young leaves exhibited the best antifungal activity against spore germination and hyphal growth by Botrytis cinerea and Fusarium oxysporum. Leaves became more susceptible to oligosaccharide treatment with increasing age. When young tissues were exposed to chitosan, we found declines in both the quantity of volatiles and their ability to inhibit fungal growth. Compared with the control, the amount of volatiles from young tissues was 88.4% lower after such treatment. In contrast, contents of volatiles from old and adult leaves were dramatically increased by chitosan oligosaccharide. Likewise, their inhibitory effect was significantly enhanced. Therefore, our results suggest that these volatiles are responsible for antifungal activity and may play a role in age-related resistance by tomato.
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Li Chaochao,Xu Xinhui,Liu Shenghao,Zhang Pengying 한국식물생명공학회 2024 Plant biotechnology reports Vol.18 No.1
Chalcone synthase (CHS), a key enzyme in plant flavonoid synthesis, is essential for plant tolerance to abiotic stress. However, little research on CHS from the earliest terrestrial plants, such as mosses, has been reported. Here, the biological function of a CHS gene from Antarctic moss Pohlia nutans (PnCHS1) was studied. PnCHS1 had a 32.8–53.7% similarity to CHS from other species, however it still had highly conserved motifs of CHS such as Catalytic site (Asn366, His333) and Co-A binding site (Ser146). Subcellular localization analysis showed that PnCHS1 was distributed in the cell membrane and in the membranes of endothelial organelles. Heterologous expression of PnCHS1 increased flavonoid content in 5-day-old Arabidopsis grown with 24 h light and 17-day-old Arabidopsis cultured with sucrose, as well as anthocyanin content in the latter. PnCHS1 heterologous expression in Arabidopsis increased plant tolerance to salt stress, including a high germina- tion rate and a long taproot. Heterologous expression of PnCHS1 boosted tolerance to oxidative stress while decreasing the sensitivity to ABA. Under H2O2 or ABA stress, the expression pattern of PnCHS1, ROS scavenging enzyme gene (FeSOD1, FeSOD2, Cu-Zn-SOD2, and Cu-Zn-SOD3) and three genes of ABA signal pathway (RAB18, RD29B, and NCED3) were considerably up-regulated by real-time quantitative analysis. It indicates that PnCHS1 could enhance plant tolerance to NaCl and oxidative stresses, and may play a role in the adaptation of Antarctic moss to extreme environments.
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