Improvement of hydrothermal response of corn seed under drought stress using abscisic acid, gibberellic acid, and salysilic acid | ||
| علوم و فناوری بذر ایران | ||
| Article 4, Volume 11, Issue 3 - Serial Number 27, November 2022, Pages 55-71 PDF (1.08 M) | ||
| Document Type: Original Article | ||
| DOI: 10.22092/ijsst.2019.125557.1264 | ||
| Authors | ||
| Elham Bahrabadi1; R. Tavakkol Afshari* 2; Mehdi Nassiri Mahallati3 | ||
| 1College of Agrotechnology ,Ferdowsi University of Mashhad | ||
| 2Ferdowsi Univ. Mashhad | ||
| 3Department of Agronomy, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad. | ||
| Abstract | ||
| In order to evaluate the effect of temperature, drought and priming on the percentage and rate germination of corn seeds, a factorial experiment based on a completely randomized design with four replicates was conducted. Treatments included eight temperature (5, 10, 15, 20, 25, 30, 35, 40 and 45 ºC), four drought potential (0, -0.4, -0.8 and -1.2 MPa), and five priming (control, hydroprimin, GA priming, ABA priming and, SA ptiming). Both percentage and rate of germination were inhibited at osmotic potentials ≤−0.8 MPa PEG. At 35 ºC temperature. Germination percentage of unprimed seeds was reduced from 94 to 36% in −1.2 MPa. Under these conditions, gibberellic acid hormone treatment improved seed germination. The effect of temperature on germination can be defined in terms of cardinal temperatures. We compared three non-linear regression models (Dent-like, segmented and beta). The outcome revealed that the Dent-like function was suitable for use in describing seed germination response to temperature. The base, optimum 1, optimum 2 and ceiling temperature were estimated to be 9.51, 24.12, 35 and 44.62 °C, respectively. The response of germination rate to both temperature and water potential can be described as a non-linear function of the hydrothermal model. According to the results of this study, hydropriming, gibberellic acid, and salicylic acid increased the mean deviation of the base temperature compared to non-priming treatment, increasing the standard deviation of the base temperature indicates the ability of seed germination in different osmotic potentials. | ||
| Keywords | ||
| Priming; drought stress; Germination; Cardinal temperatures; Hydrotermal time models | ||
| References | ||
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