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Root elongation, root surface area and organic acid by rice seedling under Al3+ and/or H+ stress

Problem statement: Under acidic condition, Al3+ is the most common species in solution. An experiment was conducted to study the effects of Al and/or pH on rice seed germination, root morphology and organic acids release. This study was conducted at ambient temperature in Malaysia. Approach: Two exp...

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Main Authors: Azman, Elisa Azura, Jusop, Shamsuddin, Ishak, Che Fauziah
Format: Article
Language:English
Published: Science Publications 2011
Online Access:http://psasir.upm.edu.my/id/eprint/23676/1/ajabssp.2011.324.331.pdf
http://psasir.upm.edu.my/id/eprint/23676/
http://thescipub.com/abstract/10.3844/ajabssp.2011.324.331
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spelling my.upm.eprints.236762017-11-20T06:13:47Z http://psasir.upm.edu.my/id/eprint/23676/ Root elongation, root surface area and organic acid by rice seedling under Al3+ and/or H+ stress Azman, Elisa Azura Jusop, Shamsuddin Ishak, Che Fauziah Problem statement: Under acidic condition, Al3+ is the most common species in solution. An experiment was conducted to study the effects of Al and/or pH on rice seed germination, root morphology and organic acids release. This study was conducted at ambient temperature in Malaysia. Approach: Two experiments were conducted: (1) Rice seeds undergoing germination were exposed to 0.5 mM CaCl2 solutions containing various concentration of Al (10, 20, 30, 40-50 µM) and (2) The seeds were soaked in water taken from an acid sulfate soil area in Malaysia for which the pH was adjusted to a range of values using 0.01 M HCl or NaOH. Results: Root length decreased with increasing Al concentration, while the opposite was true for pH. The trend for the change of root surface area with Al concentration and pH is the same as that of root length. The critical Al concentration for rice growth is 15 µM. This means that rice variety MR 219 grown on 90% of the granary areas in Malaysia is relatively less tolerant compared to other rice varieties. At low pH and high Al concentration, the rice roots secreted citrate and/or oxalate which subsequently formed Alcitrate and Al-oxalate, respectively. This, to a certain extent, had reduced Al toxicity. This is the mechanism of rice tolerance to Al toxicity. Conclusion: Acid sulfate soils in Malaysia allocated for rice production should be limed to increase water pH in the paddy field to 5.0. Then, rice can grow without Al3+ and/or H+ stress. Science Publications 2011 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/23676/1/ajabssp.2011.324.331.pdf Azman, Elisa Azura and Jusop, Shamsuddin and Ishak, Che Fauziah (2011) Root elongation, root surface area and organic acid by rice seedling under Al3+ and/or H+ stress. American Journal of Agricultural and Biological Sciences, 6 (3). pp. 324-331. ISSN 1557-4989; ESSN: 1557-4997 http://thescipub.com/abstract/10.3844/ajabssp.2011.324.331 10.3844/ajabssp.2011.324.331
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Problem statement: Under acidic condition, Al3+ is the most common species in solution. An experiment was conducted to study the effects of Al and/or pH on rice seed germination, root morphology and organic acids release. This study was conducted at ambient temperature in Malaysia. Approach: Two experiments were conducted: (1) Rice seeds undergoing germination were exposed to 0.5 mM CaCl2 solutions containing various concentration of Al (10, 20, 30, 40-50 µM) and (2) The seeds were soaked in water taken from an acid sulfate soil area in Malaysia for which the pH was adjusted to a range of values using 0.01 M HCl or NaOH. Results: Root length decreased with increasing Al concentration, while the opposite was true for pH. The trend for the change of root surface area with Al concentration and pH is the same as that of root length. The critical Al concentration for rice growth is 15 µM. This means that rice variety MR 219 grown on 90% of the granary areas in Malaysia is relatively less tolerant compared to other rice varieties. At low pH and high Al concentration, the rice roots secreted citrate and/or oxalate which subsequently formed Alcitrate and Al-oxalate, respectively. This, to a certain extent, had reduced Al toxicity. This is the mechanism of rice tolerance to Al toxicity. Conclusion: Acid sulfate soils in Malaysia allocated for rice production should be limed to increase water pH in the paddy field to 5.0. Then, rice can grow without Al3+ and/or H+ stress.
format Article
author Azman, Elisa Azura
Jusop, Shamsuddin
Ishak, Che Fauziah
spellingShingle Azman, Elisa Azura
Jusop, Shamsuddin
Ishak, Che Fauziah
Root elongation, root surface area and organic acid by rice seedling under Al3+ and/or H+ stress
author_facet Azman, Elisa Azura
Jusop, Shamsuddin
Ishak, Che Fauziah
author_sort Azman, Elisa Azura
title Root elongation, root surface area and organic acid by rice seedling under Al3+ and/or H+ stress
title_short Root elongation, root surface area and organic acid by rice seedling under Al3+ and/or H+ stress
title_full Root elongation, root surface area and organic acid by rice seedling under Al3+ and/or H+ stress
title_fullStr Root elongation, root surface area and organic acid by rice seedling under Al3+ and/or H+ stress
title_full_unstemmed Root elongation, root surface area and organic acid by rice seedling under Al3+ and/or H+ stress
title_sort root elongation, root surface area and organic acid by rice seedling under al3+ and/or h+ stress
publisher Science Publications
publishDate 2011
url http://psasir.upm.edu.my/id/eprint/23676/1/ajabssp.2011.324.331.pdf
http://psasir.upm.edu.my/id/eprint/23676/
http://thescipub.com/abstract/10.3844/ajabssp.2011.324.331
_version_ 1643828131308503040
score 13.211869

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