Abstract
Based on both morphological and physiological traits, Asian cultivated rice (Oryza sativa L.) can be classified into two distinct subspecies, indica and japonica. To better understand the differences between the two subspecies, a proteomic approach was used to profile proteins present in the yellow seedling stage of 10 indica and 10 japonica rice varieties. We report the discovery of a new protein, Indica Special Protein (ISP), which was only detected in yellow seedlings of indica varieties, and was absent from japonica varieties. Hence, ISP may represent a key gene for the differentiation of indica and japonica subspecies.
Highlights
Rice (Oryza sativa L.) is widely cultivated worldwide, providing the caloric needs for more than half of the world’s population, and especially in Asia
There are many high abundance proteins in rice green leaves, including ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO), which accounts for about 50% of total soluble protein contents and affects the detection of some low abundance protein in proteomic analysis [23]
There were no significant differences in the protein expression profiles between indica and japonica
Summary
Rice (Oryza sativa L.) is widely cultivated worldwide, providing the caloric needs for more than half of the world’s population, and especially in Asia. In addition to archaeological analysis and the use of currently available molecular markers, studies into the key domestication genes in rice will provide novel insights into the dynamics of the rice domestication process [21]. These genes are likely to be associated with grain size, shape, color, fragrance, amylose content and the reproductive barriers between the modern indica and japonica groups [21,22]. The study of ISP protein could help improve our understanding of the dynamic process of rice speciation
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