Chinese Journal OF Rice Science >
Responses of Rice Appearance and Processing Quality to Elevated Atmospheric CO2 Concentration
Received date: 2018-12-05
Revised date: 2019-04-02
Online published: 2019-07-10
【Objective】Rice appearance and processing quality will be reduced by elevated atmosphere CO2 concentration ([CO2]). To ascertain the mechanism behind this decline and then alleviate it, 【Method】we used a Free-air Carbon Dioxide Enrichment (FACE) facility, two kinds of cultivars and its three kinds of genetically modified materials (Zhonghua 11 and its transpiration-promoting genetic materials, ZmK2.1-15, ZmK2.1-20, OsKAT3-26, OsKAT3-30; Zhonghua 11 and its crown root-promoting genetic materials, ERF3-7 and ERF3-12; Nipponbare and its nitrate absorption-promoting genetic material, NIL) to study the responses of appearance and processing quality of different rice genetic materials to elevated [CO2]. 【Results】The responses of rice appearance and processing quality to elevated [CO2] varied among these genotypes. The chalky grain percentage and chalkiness degree of Zhonghua11 increased by 9.2% and 4.4% under elevated [CO2] compared with ambient [CO2], and head rice percentage decreased by 5.3%, while the chalky grain percentage and chalkiness degree of Nipponbare decreased by 11.1% and 7.9%, and head rice percentage increased by 9.8%. Transpiration-promoting genetic materials significantly mitigated the negative effect of elevated [CO2] on the appearance and processing quality of Zhonghua11. As compared with ambient [CO2], the changes in chalky grain percentages for ZmK2.1-15, ZmK2.1-20, OsKAT3-26 and OsKAT3-30 under elevated [CO2] were -2.7%, -16.3%, -14.8%, +7.4%, and that of chalkiness degree was -8.7%, -22.3%, -15.1%, -3.0%, and that of head rice percentage was +2.1%, +6.4%, +3.6%, -7.0%. Crown root-promoting genetic materials exacerbated the negative impact of elevated [CO2] on the appearance and processing quality of Zhonghua 11, with the chalky grain percentage increased by 17.7% and 11.5% under elevated [CO2], and the chalkiness degree increased by 34.4% and 19.1%, head rice percentage decreased by 10.1% and 0.8%, respectively. The chalky grain percentage and chalkiness degree of nitrate absorption-promoting material (NIL) did not change significantly at elevated [CO2], and the head rice percentage decreased by 4.2%. The appearance quality of NIL was significantly improved as compared with that of Nipponbare, with the chalky grain percentage and chalkiness degree decreased by 16.5% and 17.9% under elevated [CO2], and 26.3% and 28.9% under ambient [CO2]. 【Conclusion】The promotion of transpiration and nitrate absorption through genetic regulation could be one of the effective ways to improve the appearance and processing quality of rice under elevated [CO2] in the future.
Key words： elevated CO2 concentration; rice; appearance quality; milling quality
Dongming WANG, Ye TAO, Jianguo ZHU, Gang LIU, Chunwu ZHU . Responses of Rice Appearance and Processing Quality to Elevated Atmospheric CO2 Concentration[J]. Chinese Journal OF Rice Science, 2019 , 33(4) : 338 -346 . DOI: 10.16819/j.1001-7216.2019.8134
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