Seed morphological traits associated with weedy rice escaped from imazapic plus imazapyr herbicide treatment

Zulrushdi, Amalia Qistina and Rejab, Nur Ardiyana and Mahmod, Intan Filzah and Mohamed, Zulqarnain and Ishak, Muhammad Nazri and Mispan, Muhamad Shakirin (2022) Seed morphological traits associated with weedy rice escaped from imazapic plus imazapyr herbicide treatment. Phytoparasitica, 50 (5). pp. 1123-1132. ISSN 0334-2123, DOI

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The re-occurrence of weedy rice in the imidazolinone (IMI) herbicide-tolerant (HT) rice fields in Malaysia suggested that the weed has evaded the IMI herbicide application. This study aimed to evaluate the seed morphological traits as potential escape mechanisms of weedy rice in response to IMI-herbicide (imazapic+imazapyr) treatment. A total of 96 weedy rice samples collected from IMI-HT rice fields were characterized according to seed characteristics. The samples were evaluated for seed dormancy and susceptibility against IMI-herbicide using a standard germination test. Herbicide-induced germination test recorded a high germination (61.99-74.43%) despite strong initial dormancy (9.09-13.14%), indicating potential dormancy breaking by the herbicide. A total of 64.7% of weedy rice morphotypes displayed high seedlings survival (>10%) after herbicide treatment suggesting variation in potential IMI-resistance of weedy rice. Correlation analysis demonstrated the herbicide responses were associated with various seed adaptive traits, especially on pericarp colour (r = 0.3701), hull colour (r = -0.2457), seed dormancy (r = 0.4351), and shattering capability (r = -0.3110). This study demonstrated that seed morphological and physiological characteristics have a significant correlation with resistance towards IMI-herbicide. Resistant genes might be linked with these weedy traits as part of the adaptive mechanism for weedy rice through consequential conferment of the genes from HT-rice into weedy rice.

Item Type: Article
Funders: Fundamental Research Grant Scheme (FRGS), Ministry of Education, Malaysia [FRGS/1/2015/SG03/UM/02/3]
Uncontrolled Keywords: Herbicide resistance; Herbicide tolerant rice; Imidazolinone; Weed adaptation; Oryza sativa L
Subjects: S Agriculture > S Agriculture (General)
T Technology > T Technology (General)
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Centre for Research in Biotechnology for Agriculture
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 13 Sep 2023 03:21
Last Modified: 13 Sep 2023 03:21

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