细化搜索
结果 1-8 的 8
Ethylene positively regulates Cd tolerance via reactive oxygen species scavenging and apoplastic transport barrier formation in rice
2022
Chen, Haifei | Zhang, Quan | Lv, Wei | Yu, Xiaoyi | Zhang, Zhenhua
Ethylene regulates plant root growth and resistance to environment stress. However, the role and mechanism of ethylene signaling in response to Cd stress in rice remains unclear. Here, we revealed that ethylene signaling plays a positive role in the resistance of rice to Cd toxicity. Blocking the ethylene signal facilitated root elongation under normal conditions, but resulted in severe oxidative damage and inhibition of root growth under Cd stress. Conversely, ethylene signal enhancement by EIN2 overexpression caused root bending, similar to the response of roots to Cd stress, and displayed higher Cd tolerance than the wildtype (WT) plants. Comparative transcriptome analysis indicated EIN2-mediated upregulation of genes involved in flavonoid biosynthesis and peroxidase activity under Cd stress. The synthesis of phenolic acids and flavonoids were positively regulated by ethylene. Thus, the ein2 (ethylene insensitive 2) mutants displayed lower ROS scavenging capacity than the WT. Moreover, a significant increase in Cd accumulation and relatively increased apoplastic flow were observed in the root apex of the ein2 mutant compared with the WT plants. Overall, EIN2-mediated Cd resistance in rice is mediated by the upregulation of flavonoid biosynthesis and peroxidase activity to induce ROS scavenging, and apoplastic transport barrier formation reduces Cd uptake.
显示更多 [+] 显示较少 [-]Can heavy metal pollution defend seed germination against heat stress? Effect of heavy metals (Cu2+, Cd2+ and Hg2+) on maize seed germination under high temperature
2016
Deng, Benliang | Yang, Kejun | Zhang, Yifei | Li, Zuotong
Heavy metal pollution, as well as greenhouse effect, has become a serious threat today. Both heavy metal and heat stresses can arrest seed germination. What response can be expected for seed germination under both stress conditions? Here, the effects of heavy metals (Cu2+, Cd2+ and Hg2+) on maize seed germination were investigated at 20 °C and 40 °C. Compared with 20 °C, heat stress induced thermodormancy. However, this thermodormancy could be significantly alleviated by the addition of a low concentration of heavy metals. Heavy metals, as well as heat stress induced H2O2 accumulation in germinating seeds. Interestingly, this low concentration of heavy metal that promoted seed germination could be partly blocked by DMTU (a specific ROS scavenger), irrespective of temperature. Accordingly, H2O2 addition reinforced this promoting effect on seed germination, which was induced by a low concentration of heavy metal. Furthermore, we found that the NADPH oxidase derived ROS was required for seed germination promoted by the heavy metals. Subsequently, treatment of seeds with fluridone (a specific inhibitor of ABA) or ABA significantly alleviated or aggravated thermodormancy, respectively. However, this alleviation or aggravation could be partly attenuated by a low concentration of heavy metals. In addition, germination that was inhibited by high concentrations of heavy metals was also partly reversed by fluridone. The obtained results support the idea that heavy metal-mediated ROS and hormone interaction can finally affect the thermodormancy release or not.
显示更多 [+] 显示较少 [-]Response of abscisic acid in soybean leaves to NO2 exposure
1990
Sandhu, R. | Gupta, G. | Mulchi, C. (University of Maryland Eastern Shore, Princess Anne, MD 21853 (USA))
Stress physiological investigations of Norway spruce at a stand in northern Germany
1992
Lalk, I. (Hamburg Univ. (Germany). Inst. fuer Allgemeine Botanik und Botanischer Garten) | Naumann, R. | Ludewig, M. | Fenner, R. | Doerffling, K.
[Studies on physiological indicators for the evaluation of the amount of damage to Norway spruce]
1988
Naumann, R. (Hamburg Univ. (Germany, F.R.). Inst. fuer Allgemeine Botanik) | Ludewig, M. | Fenner, R. | Lalk, I. | Bigdon, M. | Doerffling, K.
Assessing the vitality of beech stands under the impact of various air pollution load in the Beskids [Czech Republic]
1995
Penaz, J. | Martinek, J. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Lesnicka a Drevarska Fakulta)
Changes of plant hormone levels in conifers subjected to immissions
1990
Frenzel, B. (Hohenheim Univ. (Germany, F.R.). Inst. fuer Botanik) | Christmann, A.
Investigations on the hormone-balance of healthy and damaged conifers
1986
Frenzel, B. (Hohenheim Univ., Stutgart (Germany, F.R.). Botanisches Inst.) | Christmann, A.