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Open AccessArticle

Efficacy of N-methyl-N-nitrosourea (MNU) Mutation on Enhancing the Yield and Quality of Rice

1
Graduate School for International Development and Cooperation, Hiroshima University, Hiroshima 739-8529, Japan
2
Faculty of Agriculture, Nangarhar University, Nangarhar 2601, Afghanistan
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Badam Bagh Research Station, Ministry of Agriculture, Irrigation, and Livestock, Kabul 1001, Afghanistan
4
Department of Biotechnology, NTT Institute of Hi-Technology, Nguyen Tat Thanh University, Ho Chi Minh 72820, Vietnam
5
Department of Genetic Engineering, Agricultural Genetics Institute, Hanoi 122300, Vietnam
6
Khai Xuan International Co. Ltd., Ha Dong District, Duong Noi Ward, LK20A-20B, Khai Xuan Building, Hanoi 152611, Vietnam
*
Author to whom correspondence should be addressed.
Agriculture 2019, 9(10), 212; https://doi.org/10.3390/agriculture9100212
Received: 2 September 2019 / Revised: 23 September 2019 / Accepted: 25 September 2019 / Published: 27 September 2019
Mutation technology has been applied more in recent decades to achieve novel products that are not commonly found in nature. An experiment was conducted to examine the effects of an N-methyl-N-nitrosourea (MNU) mutation on the growth, yield, and physicochemical properties of rice. Seeds of two rice cultivars (K1: DT84, and K3: Q5), along with their mutant lines (K2: mutated DT84, and K4: mutated Q5), were sown, and the established seedlings were transplanted to an open field. Ten hills per plot were randomly selected to evaluate growth parameters, yield, and components. Physicochemical attributes, including protein, amylose, and lipid contents, as well as taste score were measured by a quality tester device. The results showed that plant length, tiller number, and panicle length were higher in mutant lines than those of their cultivars. Furthermore, mutant lines took longer to reach heading and maturity stage. The highest panicle number, spikelet number, repined ratio, 1000 grain weight, 1000 brown rice weight, and grain yield were obtained in mutant lines, as compared to cultivars. The greatest grain yield was obtained in the K4 mutant line (11.6 t/ha), while the lowest was recorded in the K1 cultivar (7.7 t/ha). Lower amylose, protein, and lipid contents were observed in mutant lines compared to those in cultivars. The taste score, which increased from 67.7 to 73.7, was found to be correlated with lower amylose, protein, and lipid contents. The mutation approach increased the grain length but decreased the grain width of tested varieties. This study highlights and suggests the importance of MNU mutation in terms of rice yield improvement with preferable quality. View Full-Text
Keywords: rice; growth; yield; protein; lipid; amylose; MNU mutation; quality rice; growth; yield; protein; lipid; amylose; MNU mutation; quality
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Kakar, K.; Xuan, T.D.; Quan, N.V.; Wafa, I.K.; Tran, H.-D.; Khanh, T.D.; Dat, T.D. Efficacy of N-methyl-N-nitrosourea (MNU) Mutation on Enhancing the Yield and Quality of Rice. Agriculture 2019, 9, 212.

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