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Research articles

ScienceAsia 48 (2022): 144-150 |doi: 10.2306/scienceasia1513-1874.2022.018

Chilling resistance of corn and cold stress responses of salicylic acid-treated corn

Xilin Ning, Xiaohui Wang, Yue Cui, Xiao Li, Yan Gu*, Chunsheng Wu*

ABSTRACT:      Breeding chilling-resistant corn coupled with the use of exogenous hormones to mitigate the damage caused by stress is important in successful corn farming. Here, we evaluated the germination rate of 45 corn varieties and profiled their chilling resistance level. Besides, to determine the effect of salicylic acid (SA) treatment on plants under cold stress, we treated the corn with SA and then selected chilling-resistant and chilling-sensitive varieties. Our data demonstrated that the germination energy (GE), germination percentage (GP), and germination index (GI) for most of the cold treated corn varieties were lower than those of the control group. The membership function (MF) and D-value results showed that HengYu709 was a chilling resistant corn variety while DongDan213 was sensitive to the chilling stimuli. Furthermore, treatment with SA enhanced the chilling resistance in both HengYu709 and DongDan213. In addition, the data showed that 0.5 or 1.0 mmol/l SA treatment significantly increased photosynthesis and oxidase activity in corn under cold stress. However, a high concentration of SA could reduce the photosynthesis indexes. Taken together, our data demonstrate that SA treatment could alleviate the effect of cold stress in corn growth and development.

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a Agricultural College, Jilin Agricultural University, Changchun, Jilin 130118 China

* Corresponding author, E-mail: guyan8619@sina.com, wuchunsheng@jlau.edu.cn

Received 12 Jun 2020, Accepted 24 Jun 2021