NDLI: Modeling seed germination in Melisa officinalis L. in response to temperature and water potential

Content Provider	Springer Nature Link
Author	Atashi, Sadegh Bakhshandeh, Esmail Zeinali, Zeinab Yassari, Esmail Teixeira da Silva, Jaime A.
Copyright Year	2013
Abstract	Seed germination is greatly influenced by both temperature (T) and water potential (ψ) and these factors largely determine germination rate (GR) in the field. Quantitative information about T and ψ effects on seed germination in lemon balm (Melisa officinalis L.) is scarce. The main objective of this study was to quantify seed germination responses of lemon balm to T and ψ, and to determine cardinal temperatures in a laboratory experiment. A segmented model was used to describe the effects of ψ (i.e., T) on GR and other germination parameters. The segmented model estimates were 7.2 °C for base (T $_{b}$), 28.9 °C for optimum (T $_{o}$), 40.1 °C for ceiling temperature (T $_{c}$) and 1.64 physiological days (f $_{o}$) (equivalent to a GR$_{max}$ of 0.610 d$^{−1}$ and a thermal time of 35.6 °C days) to reach 50 % maximum germination in the control (0 MPa) treatment (R $^{2}$ = 0.99, RMSE = 0.005 day$^{−1}$). The inherent maximum rate of germination (days) was calculated by the [GR$_{max}$ = 1/f $_{o}$] model. ψ affected cardinal temperatures. From 0 to −0.76 MPa, when ψ increased, T $_{b}$ was a constant 7.2 °C to −0.38 MPa and increased linearly to 20.1 °C as ψ decreased. T $_{o}$ and f $_{o}$ increased linearly from 28.9 to 30 °C, and from 1.64 to 5.4 day$^{−1}$, respectively as ψ decreased. However, there was no signification difference in T $_{o}$ as ψ decreased nor did T $_{c}$ decrease from 40.1 to 35 °C as ψ decreased. T $_{b}$, T $_{c}$ and GR$_{max}$ were the sole parameters affected by ψ and could be used to characterize differences between ψ treatments with respect to GR at various Ts. Therefore, the segmented model and its parameters can be used in lemon balm germination simulation models.
Starting Page	605
Ending Page	611
Page Count	7
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	36
Issue Number	3
e-ISSN	18611664
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-11-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cardinal temperatures Germination rate Lemon balm Modeling Plant Physiology Plant Genetics & Genomics Plant Biochemistry Plant Pathology Plant Anatomy/Development Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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