Extracts of the Brown Alga Dictyota dichotoma (Hudson) J.V. Lamouroux Alleviate Salt Stress in Rice (Oryza sativa L.) During Germination

Algal extracts provide a safe regime for enhancing crop productivity under stressful conditions. The present study evaluated the efficiency of aqueous and ethanolic extracts of the brown alga Dictyota dichotoma in alleviation of salt stress on germination of rice seeds. Firstly, seeds were germinate...

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Veröffentlicht in:Journal of plant growth regulation 2021-06, Vol.40 (3), p.986-999
Hauptverfasser: El-Katony, Taha Mohamed, Deyab, Mohamed Ali, El-Adl, Magda Faiz, Ward, Fatma Mohamed El-Nabway
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description Algal extracts provide a safe regime for enhancing crop productivity under stressful conditions. The present study evaluated the efficiency of aqueous and ethanolic extracts of the brown alga Dictyota dichotoma in alleviation of salt stress on germination of rice seeds. Firstly, seeds were germinated using the aqueous extract of D. dichotoma at concentrations of 0, 5, 10, 20, and 50 g L −1 , prepared either at room temperature (RTE) or by boiling (BLE). The % germination of rice increased from 84% in non-treated seeds to 100% when treated with 20 g L −1 BLE, although this treatment caused reduced uniformity of germination. Embryo growth was maximum at 20 g L −1 of both extracts with superiority of BLE over RTE. In the second experiment, the effect of 20 g L −1 aqueous and ethanolic extracts relative to a balanced nutrient supply on germination of seeds treated with 0, 40, 90, and 170 mM NaCl was investigated. Salinity reduced % germination with delayed onset but high uniformity of germination, whereas algal amendments counterbalanced the effect of salinity to a greater extent relative to the nutrient supply. Upon withdrawal of salt stress, seeds promptly recovered, with more efficient recovery of seeds exposed to 170 mM than from 90 mM NaCl. The lower recovery of salt-treated seeds compared with the control seed germination suggests that rice suffered from the toxic ion effect of salinity on embryo rather than from the osmotic effect. Extracts of D. dichotoma can enhance and also alleviate salinity stress on rice seed germination.
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The % germination of rice increased from 84% in non-treated seeds to 100% when treated with 20 g L −1 BLE, although this treatment caused reduced uniformity of germination. Embryo growth was maximum at 20 g L −1 of both extracts with superiority of BLE over RTE. In the second experiment, the effect of 20 g L −1 aqueous and ethanolic extracts relative to a balanced nutrient supply on germination of seeds treated with 0, 40, 90, and 170 mM NaCl was investigated. Salinity reduced % germination with delayed onset but high uniformity of germination, whereas algal amendments counterbalanced the effect of salinity to a greater extent relative to the nutrient supply. Upon withdrawal of salt stress, seeds promptly recovered, with more efficient recovery of seeds exposed to 170 mM than from 90 mM NaCl. 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In the second experiment, the effect of 20 g L −1 aqueous and ethanolic extracts relative to a balanced nutrient supply on germination of seeds treated with 0, 40, 90, and 170 mM NaCl was investigated. Salinity reduced % germination with delayed onset but high uniformity of germination, whereas algal amendments counterbalanced the effect of salinity to a greater extent relative to the nutrient supply. Upon withdrawal of salt stress, seeds promptly recovered, with more efficient recovery of seeds exposed to 170 mM than from 90 mM NaCl. The lower recovery of salt-treated seeds compared with the control seed germination suggests that rice suffered from the toxic ion effect of salinity on embryo rather than from the osmotic effect. 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Lamouroux Alleviate Salt Stress in Rice (Oryza sativa L.) 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Lamouroux Alleviate Salt Stress in Rice (Oryza sativa L.) During Germination</atitle><jtitle>Journal of plant growth regulation</jtitle><stitle>J Plant Growth Regul</stitle><date>2021-06-01</date><risdate>2021</risdate><volume>40</volume><issue>3</issue><spage>986</spage><epage>999</epage><pages>986-999</pages><issn>0721-7595</issn><eissn>1435-8107</eissn><abstract>Algal extracts provide a safe regime for enhancing crop productivity under stressful conditions. The present study evaluated the efficiency of aqueous and ethanolic extracts of the brown alga Dictyota dichotoma in alleviation of salt stress on germination of rice seeds. Firstly, seeds were germinated using the aqueous extract of D. dichotoma at concentrations of 0, 5, 10, 20, and 50 g L −1 , prepared either at room temperature (RTE) or by boiling (BLE). The % germination of rice increased from 84% in non-treated seeds to 100% when treated with 20 g L −1 BLE, although this treatment caused reduced uniformity of germination. Embryo growth was maximum at 20 g L −1 of both extracts with superiority of BLE over RTE. In the second experiment, the effect of 20 g L −1 aqueous and ethanolic extracts relative to a balanced nutrient supply on germination of seeds treated with 0, 40, 90, and 170 mM NaCl was investigated. Salinity reduced % germination with delayed onset but high uniformity of germination, whereas algal amendments counterbalanced the effect of salinity to a greater extent relative to the nutrient supply. Upon withdrawal of salt stress, seeds promptly recovered, with more efficient recovery of seeds exposed to 170 mM than from 90 mM NaCl. The lower recovery of salt-treated seeds compared with the control seed germination suggests that rice suffered from the toxic ion effect of salinity on embryo rather than from the osmotic effect. Extracts of D. dichotoma can enhance and also alleviate salinity stress on rice seed germination.</abstract><cop>New York</cop><pub>Springer US</pub><doi>10.1007/s00344-020-10156-7</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0002-6222-7273</orcidid></addata></record>
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subjects Abiotic stress
Agriculture
Algae
Biomedical and Life Sciences
Crop production
Dictyota dichotoma
Embryos
Germination
Life Sciences
Nutrients
Plant Anatomy/Development
Plant Physiology
Plant Sciences
Recovery
Rice
Room temperature
Salinity
Salinity effects
Salinity tolerance
Salts
Seed germination
Seeds
Sodium chloride
title Extracts of the Brown Alga Dictyota dichotoma (Hudson) J.V. Lamouroux Alleviate Salt Stress in Rice (Oryza sativa L.) During Germination
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