Molecular characteristics of two new waxy mutations in China waxy maize |
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| Authors: | Wu Xiaoyang Chen Dan Liu Weihua Yang Xinming Li Xiuquan Du Juan Li Lihui |
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| Affiliation: | 1.The National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences,Chinese Academy of Agricultural Sciences,Beijing,People’s Republic of China;2.Biotechnology and Germplasm Resources Institute,Yunnan Academy of Agricultural Sciences,Kunming,People’s Republic of China;3.Yunnan Provincial Key Lab of Agricultural Biotechnology,Kunming,People’s Republic of China;4.Key Lab of Southwestern Crop Gene Resource and Germplasm Innovation,Ministry of Agriculture,Kunming,People’s Republic of China;5.Scientific Observation for Rice Germplasm Resources of Yunnan,Ministry of Agriculture,Kunming,People’s Republic of China |
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| Abstract: | The waxy gene mutation causes waxy maize grain to have a sticky quality. China has numerous waxy maize landraces and is thought to be the place of origin of waxy maize. The most abundant waxy maize resources in China are located in the Yunnan province and its surrounding areas. We collected 57 waxy maize landraces from Yunnan province and cloned and sequenced the waxy gene from its fourth to eighth exon. Two new waxy gene mutations, named wx-Cin4 and wx-124, were identified. The wx-Cin4 mutation is a 466-bp retrotransposon inserted into exon six. The wx-124 mutation is a 116-bp miniature inverted-repeat transposable element inserted into exon seven. This is the first time a 124-type mutation has been found in a maize waxy gene. The discovery of the two specific waxy mutations from landraces collected in Yunnan province provides new evidence supporting the hypothesis that China is the origin area for waxy maize. |
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