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Anthocyanin Accumulation in Black Kernel Mutant Rice and its Contribution to ROS Detoxification in Response to High Temperature at the Filling Stage

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Institute of Crop Science, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
2
College of Agriculture, Bahauddin Zakariya University Sub-Campus Bahadur, Layyah 31200, Pakistan
*
Author to whom correspondence should be addressed.
Antioxidants 2019, 8(11), 510; https://doi.org/10.3390/antiox8110510
Received: 4 September 2019 / Revised: 23 October 2019 / Accepted: 23 October 2019 / Published: 25 October 2019
Effect of high temperature (HT) on anthocyanin (ANS) accumulation and its relationship with reactive oxygen species (ROS) generation in color rice kernel was investigated by using a black kernel mutant (9311bk) and its wildtype (WT). 9311bk showed strikingly higher ANS content in the kernel than WT. Just like the starch accumulation in rice kernels, ANS accumulation in the 9311bk kernel increased progressively along with kernel development, with the highest level of ANS at kernel maturity. HT exposure evidently decreased ANS accumulation in 9311bk kernel, but it increased ROS and MDA concentrations. The extent of HT-induced decline in kernel starch accumulation was genotype-dependent, which was much larger for WT than 9311bk. Under HT exposure, 9311bk had a relatively lower increase in ROS and MDA contents than its WT. This occurrence was just opposite to the genotype-dependent alteration in the activities of antioxidant enzymes (SOD, CAT and APX) in response to HT exposure, suggesting more efficiently ROS detoxification and relatively stronger heat tolerance for 9311bk than its WT. Hence, the extent of HT-induced declines in grain weight and kernel starch content was much smaller for 9311bk relative to its WT. HT exposure suppressed the transcripts of OsCHS, OsF3’H, OsDFR and OsANS and impaired the ANS biosynthesis in rice kernel, which was strongly responsible for HT-induced decline in the accumulation of ANS, C3G, and P3G in 9311bk kernels. These results could provide valuable information to cope with global warming and achieving high quality for color rice production. View Full-Text
Keywords: Oryza sativa L.; color rice; pigment accumulation; anthocyanin biosynthesis; antioxidant metabolism; high temperature Oryza sativa L.; color rice; pigment accumulation; anthocyanin biosynthesis; antioxidant metabolism; high temperature
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Zaidi, S.H.R.; Zakari, S.A.; Zhao, Q.; Khan, A.R.; Shah, J.M.; Cheng, F. Anthocyanin Accumulation in Black Kernel Mutant Rice and its Contribution to ROS Detoxification in Response to High Temperature at the Filling Stage. Antioxidants 2019, 8, 510.

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