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Plants 2018, 7(2), 40; https://doi.org/10.3390/plants7020040

Allelopathic Responses of Rice Seedlings under Some Different Stresses

1
Agricultural Genetics Institute, Pham Van Dong, Tu Liem, Hanoi 123000, Vietnam
2
Graduate School for International Development and Cooperation (IDEC), Hiroshima University, Higashi-Hiroshima 739-8529, Japan
3
Plant Resource Center, An Khanh, Hoai Duc, Hanoi 152900, Vietnam
4
Post Graduate Training Department, Vietnam Academy of Agricultural Sciences, Hanoi 128200, Vietnam
5
Institute of Biomedical and Pharmaceutical Applied Research Centre, Vietnam Military Medical University (VMMU), Hanoi 150000, Vietnam
*
Author to whom correspondence should be addressed.
Received: 5 February 2018 / Revised: 19 April 2018 / Accepted: 20 April 2018 / Published: 8 May 2018
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Abstract

The objective of this study was to evaluate the allelopathic responses of rice seedlings under submergence stress at different temperatures (10, 25, 32, and 37 °C). The results showed that a wide range of allelopathic responses of rice seedlings depended on varieties and stress conditions, with temperature was being a key factor. It showed that the extracts of rice seedlings induced significant suppression on lettuce and radish seedling germination, but had negligible allelopathic effects on growth of barnyardgrass, whilst the emergence and growth of natural weeds was stimulated. In contrast, the root exudates of Koshihikari rice seedlings (K32) at 32 °C reduced the number of total weeds by ≈60.0% and the total dry weight of weeds by 93.0%; i.e., to a greater extent than other root exudates. Among the 13 identified phenolic acids, p-hydroxybenzoic, vanillic, syringic, sinapic and benzoic acids—at concentrations of 0.360, 0.045, 3.052, 1.309 and 5.543 μg/mL might be involved in allelopathic responses of K32, inhibiting the growth of barnyardgrass and natural weeds. Findings of the present study may provide useful information on allelopathic responses of rice under environmental stresses and thus further understand of the competitive relationships between rice and weeds under natural conditions. View Full-Text
Keywords: allelopathy; allelochemical; rice; environmental stress; barnyardgrass; weeds; phenolic acids allelopathy; allelochemical; rice; environmental stress; barnyardgrass; weeds; phenolic acids
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Khanh, T.D.; Anh, L.H.; Nghia, L.T.; Huu Trung, K.; Bich Hien, P.; Minh Trung, D.; Dang Xuan, T. Allelopathic Responses of Rice Seedlings under Some Different Stresses. Plants 2018, 7, 40.

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