Abstract
Black rice has very superior medicinal value. Since ancient times, it has been used as a nourishing and health-care rice for medicine and food. It has powerful functions such as disease prevention, regulation of circadian rhythm, and promotion of physical recovery. It is suitable for long-term consumption. In this paper, optical microscope, scanning electron microscope and energy dispersive spectrometer (SEM-EDS) were used successively to visualize and quantitatively analyze the element distribution in the chalky and non-chalky areas of two indica rice varieties in Southern Henan. The results showed that black rice has rich C and O content, followed by N, P, S content, Mg, K, Ca, Mn, Zn content is less. The content of the O element in the chalky area is higher than that of the non-chalky area, while many elements such as C, N, P, S are significantly higher in the non-chalk areas than in the chalk areas; especially the N and S elements are the best indicators of protein, the content in chalkiness area was lower than that in non-chalky area. It can be inferred that the protein content in non-chalky part was higher than that in chalky part, that is, chalkiness character of black rice would affect the nutritional quality of rice. Therefore, our results showed the distribution of elements and protein in black rice, which is helpful for the cultivation of new high-quality black rice varieties in the future.
Highlights
Rice (Oryza sativa L.) is an important model organism in crop research (Zhang et al, 2007, 2008) and a staple food for more than half of the world's population (Zeng et al, 2003; Kim et al, 2013; Wang et al, 2018), and the demand for high-quality rice is increasing with the continuous improvement of people's living standards (Fitzgerald et al, 2009; Peng et al, 2014; Zhou et al, 2015)
The results showed that the heart white rice section, abdominal white rice section and back white rice section were included, the heart white and abdominal white section selected two loci of the rice seed section and the rice center, and the middle and abdominal chalky back white rice selected two loci of the rice seed section and three loci of the rice seed center, that is, the chalky trait site and the non-chalky trait site of black rice for element content detection
The results showed that the contents of N and S elements in the non-cretaceous trait sites of black rice Zigu and Youzhizihei were higher than those in the sites with cretaceous trait, so it was speculated that the protein content in the cretaceous trait sites was less than that in the non-Cretaceous trait sites
Summary
Rice (Oryza sativa L.) is an important model organism in crop research (Zhang et al, 2007, 2008) and a staple food for more than half of the world's population (Zeng et al, 2003; Kim et al, 2013; Wang et al, 2018), and the demand for high-quality rice is increasing with the continuous improvement of people's living standards (Fitzgerald et al, 2009; Peng et al, 2014; Zhou et al, 2015). Black rice contains a variety of vitamins, about twice the vitamin content of common rice (Wanming et al, 2005), about 37% higher protein content than common rice, and 15.8% higher total amino acid content than common rice (Luo et al, 2015). Black rice contains amino acid forms more similar to those required by the human body, and the content of essential amino acids is 25%, the nutritional value of protein is extremely high (Jin et al, 2016). Black rice cooked rice porridge is rich in nutrients, has a good tonic effect, in addition, can be made into a variety of nutritious food, can be used to brew jas.ccsenet.org
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