Under Pressure: Maternal Effects Promote Drought Tolerance in Progeny Seed of Palmer Amaranth (Amaranthus palmeri)
The environmental conditions under which parental plants are reared can affect the seed characteristics of the progeny. The variation originating from such maternal effects has rarely been incorporated into models of seed germination. Here, using Palmer amaranth (Amaranthus palmeri S. Watson), we ex...
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Published in | Weed science Vol. 69; no. 1; pp. 31 - 38 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
New York, USA
The Weed Science Society of America
01.01.2021
Cambridge University Press |
Subjects | |
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Abstract | The environmental conditions under which parental plants are reared can affect the seed characteristics of the progeny. The variation originating from such maternal effects has rarely been incorporated into models of seed germination. Here, using Palmer amaranth (Amaranthus palmeri S. Watson), we examined the effects of water stress during the growth of parental plants on the progeny seed characteristics, including weight, size, final germination, and parameters of a hydrotime germination model. We grew two populations (from California and Kansas) under continuous water-deficit or well-watered conditions. In both A. palmeri populations, progeny seeds originating from water-stressed plants were heavier and larger than those from well-watered plants. Plants exposed to water stress also produced seeds that were ∼30% less dormant than seeds from control plants. To test whether the maternal environment affects the parameters of a hydrotime model, progeny seeds were subject to five water potentials (0, –0.2, –0.4, –0.6, and –0.8 MPa) and incubated at 20 and 30 C; germination was monitored daily. The estimated median base water potential (Ψb(50)), that is, the water potential at which 50% of seeds cannot germinate, was consistently lower for seeds from water-stressed plants than for seeds from well-watered plants. Our results showed that A. palmeri plants experiencing drought during their growth produce seeds that are less dormant and can germinate from drier conditions—a maternal response that seems to be adaptive. These findings also call for development of germination models that incorporate the environmental conditions of both the current and past seasons to better describe the variability in germination of weed seeds. |
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AbstractList | Abstract
The environmental conditions under which parental plants are reared can affect the seed characteristics of the progeny. The variation originating from such maternal effects has rarely been incorporated into models of seed germination. Here, using Palmer amaranth (
Amaranthus palmeri
S. Watson), we examined the effects of water stress during the growth of parental plants on the progeny seed characteristics, including weight, size, final germination, and parameters of a hydrotime germination model. We grew two populations (from California and Kansas) under continuous water-deficit or well-watered conditions. In both
A. palmeri
populations, progeny seeds originating from water-stressed plants were heavier and larger than those from well-watered plants. Plants exposed to water stress also produced seeds that were ~30% less dormant than seeds from control plants. To test whether the maternal environment affects the parameters of a hydrotime model, progeny seeds were subject to five water potentials (0, −0.2, −0.4, −0.6, and −0.8 MPa) and incubated at 20 and 30 C; germination was monitored daily. The estimated median base water potential (Ψ
b
(50)
), that is, the water potential at which 50% of seeds cannot germinate, was consistently lower for seeds from water-stressed plants than for seeds from well-watered plants. Our results showed that
A. palmeri
plants experiencing drought during their growth produce seeds that are less dormant and can germinate from drier conditions—a maternal response that seems to be adaptive. These findings also call for development of germination models that incorporate the environmental conditions of both the current and past seasons to better describe the variability in germination of weed seeds. The environmental conditions under which parental plants are reared can affect the seed characteristics of the progeny. The variation originating from such maternal effects has rarely been incorporated into models of seed germination. Here, using Palmer amaranth (Amaranthus palmeri S. Watson), we examined the effects of water stress during the growth of parental plants on the progeny seed characteristics, including weight, size, final germination, and parameters of a hydrotime germination model. We grew two populations (from California and Kansas) under continuous water-deficit or well-watered conditions. In both A. palmeri populations, progeny seeds originating from water-stressed plants were heavier and larger than those from well-watered plants. Plants exposed to water stress also produced seeds that were ∼30% less dormant than seeds from control plants. To test whether the maternal environment affects the parameters of a hydrotime model, progeny seeds were subject to five water potentials (0, –0.2, –0.4, –0.6, and –0.8 MPa) and incubated at 20 and 30 C; germination was monitored daily. The estimated median base water potential (Ψb(50)), that is, the water potential at which 50% of seeds cannot germinate, was consistently lower for seeds from water-stressed plants than for seeds from well-watered plants. Our results showed that A. palmeri plants experiencing drought during their growth produce seeds that are less dormant and can germinate from drier conditions—a maternal response that seems to be adaptive. These findings also call for development of germination models that incorporate the environmental conditions of both the current and past seasons to better describe the variability in germination of weed seeds. The environmental conditions under which parental plants are reared can affect the seed characteristics of the progeny. The variation originating from such maternal effects has rarely been incorporated into models of seed germination. Here, using Palmer amaranth (Amaranthus palmeri S. Watson), we examined the effects of water stress during the growth of parental plants on the progeny seed characteristics, including weight, size, final germination, and parameters of a hydrotime germination model. We grew two populations (from California and Kansas) under continuous water-deficit or well-watered conditions. In both A. palmeri populations, progeny seeds originating from water-stressed plants were heavier and larger than those from well-watered plants. Plants exposed to water stress also produced seeds that were ~30% less dormant than seeds from control plants. To test whether the maternal environment affects the parameters of a hydrotime model, progeny seeds were subject to five water potentials (0, −0.2, −0.4, −0.6, and −0.8 MPa) and incubated at 20 and 30 C; germination was monitored daily. The estimated median base water potential (Ψb(50)), that is, the water potential at which 50% of seeds cannot germinate, was consistently lower for seeds from water-stressed plants than for seeds from well-watered plants. Our results showed that A. palmeri plants experiencing drought during their growth produce seeds that are less dormant and can germinate from drier conditions—a maternal response that seems to be adaptive. These findings also call for development of germination models that incorporate the environmental conditions of both the current and past seasons to better describe the variability in germination of weed seeds. |
Author | Osipitan, O. Adewale Mesgaran, Mohsen B. Matzrafi, Maor Ohadi, Sara |
Author_xml | – sequence: 1 givenname: Maor surname: Matzrafi fullname: Matzrafi, Maor organization: Former Postdoctoral Research Fellow, Department of Plant Sciences, University of California, Davis, Davis, CA, USA; current: Department of Plant Pathology and Weed Research, Agricultural Research Organization, Newe Ya'ar Research Center, Israel – sequence: 2 givenname: O. Adewale surname: Osipitan fullname: Osipitan, O. Adewale organization: Postdoctoral Fellow, Department of Plant Sciences, University of California, Davis, Davis, CA, USA – sequence: 3 givenname: Sara surname: Ohadi fullname: Ohadi, Sara organization: Postdoctoral Fellow, Department of Plant Sciences, University of California, Davis, Davis, CA, USA – sequence: 4 givenname: Mohsen B. orcidid: 0000-0002-0841-6188 surname: Mesgaran fullname: Mesgaran, Mohsen B. organization: Assistant Professor, Department of Plant Sciences, University of California, Davis, Davis, CA, USA |
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ContentType | Journal Article |
Copyright | The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the associated terms available at: https://uk.sagepub.com/en-gb/eur/reusing-open-access-and-sage-choice-content |
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Snippet | The environmental conditions under which parental plants are reared can affect the seed characteristics of the progeny. The variation originating from such... Abstract The environmental conditions under which parental plants are reared can affect the seed characteristics of the progeny. The variation originating from... |
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SubjectTerms | Amaranth Amaranthus palmeri Drought resistance Environment models Environmental conditions Germination Herbicides hydrotime model Maternal effects Offspring Parameters Population Populations Pressure effects Progeny Seed germination Seeds transgenerational model Water potential Water stress |
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Title | Under Pressure: Maternal Effects Promote Drought Tolerance in Progeny Seed of Palmer Amaranth (Amaranthus palmeri) |
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