Morphological variation, distribution and relationship of weedy rice (Oryza sativa L.) in Peninsular Malaysia

Mahmod, Intan Filzah and Saiman, Mohd Zuwairi and Mohamed, Zulqarnain and Ishak, Muhammad Nazri and Mispan, Muhamad Shakirin (2021) Morphological variation, distribution and relationship of weedy rice (Oryza sativa L.) in Peninsular Malaysia. Weed Biology and Management, 21 (2). pp. 86-99. ISSN 1444-6162, DOI

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The dynamic changes in agricultural practices have negatively impacted rice cultivation resulting in serious weedy rice (Oryza sativa L.) infestations. In this study, field surveys were conducted at six granaries to evaluate the abundance, spatial-distribution patterns, and morphological characteristics of weedy rice in Peninsular Malaysia. An average of 5.28 plants/m(2) weedy rice density was recorded, with coverage area that ranged from 29% to 66% and occurrence at >67% frequency. Seed morphological characteristics identified the existence of at least 18 biotypes. A total of 134 weedy rice samples were characterized morphologically, and Principle Component Analysis results showed that these samples are highly diverse and are dispersed across Peninsular Malaysia. These genetically diverse reservoir of weedy rice characteristics present opportunities of exploitation in the future, especially through rice breeding and crop improvement. Weedy rice from Kelantan and Selangor displayed unique clusters in the PCA plot which suggest higher tendencies for environmental adaptation although the influencing factors have yet to be determined. Dispersion studies based on Lloyd patchiness index revealed that more than 50% of surveyed field blocks in five states displayed uniform distribution as opposed to cluster distribution observed in the remaining field blocks. These variations in dispersion suggested that farmers in Peninsular Malaysia employed inconsistent weedy rice management practices in every granary and farm block. Observation of weedy rice infestation pattern via spatial distribution suggested that weed management requires proper coordination of control efforts among farmers to ensure the degree of infestation is maintained under a controlled level.

Item Type: Article
Funders: Research University Grant (RU006-2017), Universiti Malaya (BK044-2015), Bantuan Kecil Penyelidikan, Ministry of Education (FRGS/1/2015/SG03/UM/02/3), Fundamental Research Grant Scheme (FRGS)
Uncontrolled Keywords: Rice germplasm; Weed adaptation; Weed dispersion; Weed management; Weedy rice diversity
Subjects: Q Science > QK Botany
S Agriculture > S Agriculture (General)
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms Zaharah Ramly
Date Deposited: 28 Jun 2022 01:36
Last Modified: 28 Jun 2022 01:36

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