海南南繁区水稻基因飘流的最大阈值距离及其时空分布特征

doi:10.3864/j.issn.0578-1752.2014.23.001

Abstract

Abstract: 【Objective】The area of three counties of Lingshui, Sanya and Ledong is a major base or center for Hainan crop winter-season multiplication (HCWM) of different types of rice, including genetically modified (GM) rice. The objective of this study is to calculate the maximum threshold distances of gene flow (MTDs) in the region and to draw a small-scale and even more precise picture of MTDs spatial distribution, which may serve as a reference for setting proper isolation distances in plantation of different types of traditional and GM rice. 【Method】 By adopting an established rice gene flow model and the meteorological data recorded at 52 automated meteorological stations in 27 towns as a model input, the MTDs of rice cultivars and male sterile (ms) lines at a town level were calculated. On the basis of these data, the patterns of spatial distribution of MTDs in the region and its key determining factors were analyzed. According to the national standards of rice seed purity issued by Ministry of Agriculture (MOA), China, 1% or 0.1% was used as a threshold value. 【Result】 Results indicated that in the HCWM region, the MTD_1%to ms lines ranged from 53 m to 195 m with a mean of (110±31) m. The MTD_0.1% to ms lines ranged from 75 m to 271 m with an average value of (169±44) m. In contrast, the MTD_1% to common rice cultivars was less than 1 m in all locations, and the MTD_0.1% was 0.6 m to 5.8 m with a mean of (3.4±1.1) m. These data show that there is a 50-fold difference between MTD_0.1% to ms lines and cultivated rice. It was found that there were two centers and 4 spots with high MTDs, and 3 centers and 5 spots with low MTDs in the region. The three counties of Lingshui, Sanya and Ledong are situated in a tropical zone, along the South China Sea coast with a protective screen provided by the Five-finger Mountains (FFM) at north. In the winter season, the prevailing wind direction in the region is north-east monsoon, while in the spring and early summer, it becomes south-east monsoon from the South Pacific Ocean and south-west monsoon from the Indian Ocean. Higher wind speed usually occurs in the plain region along sea coast. Wind direction and speed in the hilly region between the plain region and the FFM is also influenced by the height and trend of hills. Wind speed near the south slope of the FFM is greatly reduced by its protective effect. 【Conclusion】 The topography and the atmospheric circulation that affect wind speed and direction, to a great extent, determine the basic distribution patterns of MTDs in the region: the high MTDs mainly exist at the east and west wing of the region as well as in the south coast plain region; while the low MTDs typically distributed in the south slope region of the FFM that provides an effective protection.

Key words: rice (Oryza sativa L.), male sterile line, Hainan crop winter-season multiplication, gene flow, maximum threshold distances

HU Ning, YAO Ke-min, YUAN Qian-hua, JIA Shi-rong, HE Mei-dan, JIANG Xiao-dong, XU Li-xin, HU Ji-chao, PEI Xin-wu. The Maximum Threshold Distances of Rice Gene Flow and Its Temporal and Spatial Distribution in the Hainan Crop Winter-Season Multiplication Region of China[J].Scientia Agricultura Sinica, 2014, 47(23): 4551-4562.

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