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Qian Zhang
College of Agriculture, Northeast Agricultural University, Harbin 150030, China

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Journal article
Published: 30 June 2021 in Agronomy
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Maize (Zea mays L.) is a chilling-sensitive plant. Chilling stress in the early seedling stage seriously limits the growth, development, productivity and geographic distribution of maize. Salicylic acid (SA) is a plant growth regulator involved in the defenses against abiotic and biotic stresses as well as in plant development. However, the physiological mechanisms underlying the effects of foliar applied SA on different maize inbred lines under chilling stress are unclear. Two inbred lines, cold-sensitive cv. C546 and cold-tolerant cv. B125, were used to study the effects of SA on the growth and physiology of maize seedlings. The results showed that the application of SA at 50 mg/L on the leaves of maize seedlings under 4 °C decreased the relative electrolyte conductivity (REC) and the malondialdehyde (MDA) and reactive oxygen species (ROS) (H2O2 and O2) content due to increased superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX) activity; SA also improved photosynthesis in the seedlings through increased chlorophyll content, enhanced Pn and Gs, and decreased Ci. SA application also increased the proline content and the relative water content (RWC) in the maize seedlings, thereby improving their osmotic adjustment capacity. The increase rate caused by SA of plant height and dry weight in C546 were 10.5% and 5.4% higher than that in B125 under 4 °C. In conclusion, SA promotes maize seedling growth and physiological characteristics, thus enhancing chilling resistance and the effect of SA on the chilling resistance of cold-sensitive cv. was stronger than that on cold-tolerant cv. at the low temperature.

ACS Style

Qian Zhang; Dongmei Li; Qi Wang; Xiangyu Song; Yingbo Wang; Xilang Yang; Dongling Qin; Tenglong Xie; Deguang Yang. Exogenous Salicylic Acid Improves Chilling Tolerance in Maize Seedlings by Improving Plant Growth and Physiological Characteristics. Agronomy 2021, 11, 1341 .

AMA Style

Qian Zhang, Dongmei Li, Qi Wang, Xiangyu Song, Yingbo Wang, Xilang Yang, Dongling Qin, Tenglong Xie, Deguang Yang. Exogenous Salicylic Acid Improves Chilling Tolerance in Maize Seedlings by Improving Plant Growth and Physiological Characteristics. Agronomy. 2021; 11 (7):1341.

Chicago/Turabian Style

Qian Zhang; Dongmei Li; Qi Wang; Xiangyu Song; Yingbo Wang; Xilang Yang; Dongling Qin; Tenglong Xie; Deguang Yang. 2021. "Exogenous Salicylic Acid Improves Chilling Tolerance in Maize Seedlings by Improving Plant Growth and Physiological Characteristics." Agronomy 11, no. 7: 1341.

Research article
Published: 01 January 2020 in Crop and Pasture Science
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Maize (Zea mays L.) is one of the most important crops worldwide. However, low temperature limits seed germination and seedling growth of maize, which can in turn affect grain yield. The calcium ion (Ca2+) is the second messenger involved in the response to environmental-stimuli-induced signal transduction networks. The underlying physiological mechanisms related to the effects of exogenous Ca2+ treatment of different maize cultivars under low temperature are unclear. We selected two inbred lines, cold-sensitive cv. C546 and cold-tolerant cv. Y478, for studying the effects of Ca2+ on seed germination, photosynthesis, antioxidant enzymes and the osmotic regulation of seedling resistance to low temperature. The optimal concentration of CaCl2 was 80 mmol L–1, which significantly improved the germination percentage at temperatures <10°C. Application of CaCl2 at this concentration under cold stress mitigated the degree of membrane injury and improved the antioxidant enzyme system through reduced relative electrolyte conductivity and malondialdehyde content, increased the soluble protein content, and enhanced superoxide dismutase and peroxidase activity. CaCl2 also significantly increased chlorophyll fluorescence indicators (Fv/Fo, Fv/Fm) and the photosynthetic rate. We conclude that exogenous CaCl2 at a concentration of 80 mmol L–1 protects the function and structure of the membrane and photosystems, improves antioxidant enzyme activity and increases osmotic regulatory substances under cold stress. These results improve our understanding of the mechanisms of Ca2+ and contribute to the development of cold-tolerant maize varieties.

ACS Style

Qian Zhang; Yongxi Liu; Qiaoqiao Yu; Yue Ma; Wanrong Gu; Deguang Yang. Physiological changes associated with enhanced cold resistance during maize (Zea mays) germination and seedling growth in response to exogenous calcium. Crop and Pasture Science 2020, 71, 529 .

AMA Style

Qian Zhang, Yongxi Liu, Qiaoqiao Yu, Yue Ma, Wanrong Gu, Deguang Yang. Physiological changes associated with enhanced cold resistance during maize (Zea mays) germination and seedling growth in response to exogenous calcium. Crop and Pasture Science. 2020; 71 (6):529.

Chicago/Turabian Style

Qian Zhang; Yongxi Liu; Qiaoqiao Yu; Yue Ma; Wanrong Gu; Deguang Yang. 2020. "Physiological changes associated with enhanced cold resistance during maize (Zea mays) germination and seedling growth in response to exogenous calcium." Crop and Pasture Science 71, no. 6: 529.