Shulin Zhang^1,2 , Li Tian¹ , Juan Li² , Cong Wang¹ , Dongsun  Lee² , Renhai  Peng¹ , Lijuan Chen²

1 College of Biology and Food Technology, Anyang Institute of Technology, Anyang, 455000, China
2 Rice Research Institute, Yunnan Agricultural University, Kunming, 650201, China
Author    Correspondence author
Molecular Plant Breeding, 2017, Vol. 8, No. 6   doi: 10.5376/mpb.2017.08.0006
Received: 09 Jun., 2017    Accepted: 26 Jun., 2017    Published: 28 Jul., 2017

This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Zhang S.L., Tian L., Li J., Lee D.S., Peng R.H., and Chen L.J., 2017, Morphological characterization of weedy rice populations from different regions of Asia, Molecular Plant Breeding, 8(6): 52-64 (doi: 10.5376/mpb.2017.08.0006)

Weedy rice produces a low number of grains per plant and is considered undesirable in cultivated rice fields. It spreads rapidly because of its high phenotypic plasticity and seed shattering. We used the RID14 marker to identify the genotypes governing red and white pericarp color in weedy rice. We then evaluated 18 characters of 199 weedy rice accessions (5 rice-growing regions in Asia) and 24 of cultivated rice as control, and analyzed them using coefficients of variation, principal component analysis, and cluster analysis. Our results showed that weedy rice accessions and cultivated rice populations from different regions of Asia were significantly different in one or more of their morphological characteristics. Weedy rice significantly differed from cultivated rice in plant height at vegetative growth phase, and in pericarp color and seed shattering during the reproductive growth phase. According to principal component analysis, weedy rice populations were significantly separated from cultivated rice in North China, Korea, Southeast Asia, Korea, and South China. We used principal component analysis and cluster analysis to categorize weedy rice populations into 3 main groups: Group 1 from Korea and Northern China; group 2 from Southern China and Southeast Asia; and group 3 from Eastern China. This study established an index for morphological characteristics of weedy rice to facilitate its identification the fields, which are expected to provide a theoretical basis for weedy rice infestation control in Asia.

Cultivated rice (Oryza sativa L.); Cluster analysis; Principal component analysis (PCA); Weedy rice (Oryza sativa f. spontanea)