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Effect of controlled soil drying on the grain yield and nutritional quality of rice
Author(s) -
Ju Chengxin,
Liu Tao,
Sun Chengming
Publication year - 2021
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.1002/csc2.20439
Subject(s) - oryza sativa , photosynthesis , agronomy , transpiration , biology , yield (engineering) , abscisic acid , grain quality , irrigation , brown rice , horticulture , botany , food science , materials science , biochemistry , gene , metallurgy
Controlled soil drying can substantially enhance water use efficiency by reducing irrigation water. However, grain quality traits are yet to be studied under such an irrigation regime, particularly on nutritional quality and heavy metal residues. This study investigated these issues by using two varieties Yongyou 2640 (YY‐2) and Nanjing 9108 (NJ‐9). Rice ( Oryza sativa L.) was grown in the field under controlled soil drying (SD) and continuous flooding irrigation (FI). The results showed that, compared with FI, SD increased grain yield and nutritional quality simultaneously for both NJ‐9 and YY‐2. When compared with NJ‐9, YY‐2 had greater grain and protein yield, higher concentrations of As and Cd, and higher photosynthetic rate and transpiration rate when plants were rewatered. Although the relative content of protein and essential amino acids decreased in the SD regime, the absolute content (protein yield and amino acid yield) was increased. Besides, SD improved protein components and essential amino acid score (AAS) and decreased residues of As. The results demonstrated that SD improved photosynthetic characteristics and increased grain abscisic acid levels of inferior grains during soil drying. The results suggest that the adoption of SD may exert a synergistic effect on both grain yield and grain quality.