Allelopathic Activity of Dehulled Rice and its Allelochemicals on Weed Germination

  • Khang D
  • Anh L
  • Thu Ha P
  • et al.
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Abstract

In this study, the allelopathic potential of dehulled rice, rice, and hulls of rice on germination of weeds was evaluated in laboratory. Phenolic acids in growth media of these plants were also identified and quantified using HPLC. Identified allelochemicals were reversely tested for phytotoxic effects on germination and seedling growth of barnyardgrass, lettuce, radish and rice. The results showed that the inhibitory effects of dehulled rice were stronger than those of hulls and rice. Dehulled rice caused 66.7% and 50.6% reduction in radish root length and lettuce shoot height, respectively. Dehulled rice showed strong inhibitory effects on root length of lettuce and shoot height of radish while hulls and rice exhibited stimulation. Regarding phenolic identification, vanillin and vanillic acid were detected as allelochemicals in root exudates of rice and tested plants. The results revealed that most of the vanillin and vanillic acid treatments showed high inhibitory effects on germination rates and seedling growth of lettuce and radish, high stimulatory activity on root elongation of rice. Vanillic acid (100 ppm and 200 ppm), vanillin (100 ppm) and their mixture (200 ppm) completely inhibited survival of lettuce. The findings indicate the allelopathic potential of dehulled rice which can be used for identification of more phytotoxins to produce bioherbicides in agricultural practices. Introduction Weed is one of the most serious problems facing rice production around the world. In fact, weed invasion is responsible for more rice yield loss than pests and diseases [1]. Traditionally, hand-weeding is primarily applied to control weed in paddy fields; however, this approach costs a huge amount of casual labor, which has declined due to fast industrialization [2]. This phenomenon makes the conventional weed management ineffective. As a consequence, herbicides are increasingly employed as an inevitable alternative. Annually, approximately three billion tons of herbicides are used in areas of agricultural production all over the world [3]. Although herbicides are economical and effective, they cause devastating effects on the environment, human health and an increase in the risk of herbicide resistance of weeds that may threaten sustainable crop production [4-7]. To tackle the mentioned challenges in weed management for maintaining sustainable rice production, biologically novel weed treatments should be prioritized, one of which is using allelopathy as an effective and efficient manner due to its cost effective and eco-friendly aspects [7]. Among herbaceous plants possessing allelopathic property, rice has recently attracted a great deal of interest among scientists, especially after the study of Dilday et al. relating to allelopathic activity

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APA

Khang, D. T., Anh, L. H., Thu Ha, P. T., Tuyen, P. T., Quan, N. V., Minh, L. T., … Trung, K. H. (2016). Allelopathic Activity of Dehulled Rice and its Allelochemicals on Weed Germination. International Letters of Natural Sciences, 58, 1–10. https://doi.org/10.18052/www.scipress.com/ilns.58.1

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