Studies on the effects of pericarp pigmentation on grain development and yield of black rice
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Authors
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Md Mominur Rahman
Molecular Genetics Laboratory, School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Korea
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Kyung Eun Lee
Molecular Genetics Laboratory, School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Korea
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Sang Gu Kang
Molecular Genetics Laboratory, School of Biotechnology, Yeungnam University, Gyeongsan 712-749, Korea
Abstract
Black rice was characterized by dark purple pericarp and
much lower yield than that of white rice varieties. We
investigated the factors responsible for the lower yields of
black rice by conducting crosses of rice with purple pericarp
mutant and white pericarp cultivars. The seed weight of
black rice was lower than that of brown or white rice progeny
within the crosses. The F2 segregants showed increased
anthocyanin deposition with simultaneous reduction of
chlorophyll in the seed pericarp. These results revealed
that an unknown metabolic alteration exists in the
chlorophyll synthesis due to the high level of cyanindin-3-
0-glucoside deposition in the purple pericarp rice,
indicating that anthocyanin deposition in the pericarp of
black rice hindered the photosynthetic rate, leading to low
yield. These findings suggest that the low yield of black
rice is closely related to physiological factors other than
the genetic yield traits