TY - JOUR
T1 - Response of Grain Yield and Water Use Efficiency to Irrigation Regimes during Mid-Season indica Rice Genotype Improvement
AU - Jing, Wenjiang
AU - Wu, Hao
AU - Gu, Hanzhu
AU - Xiao, Zhilin
AU - Wang, Weilu
AU - Zhang, Weiyang
AU - Gu, Junfei
AU - Liu, Lijun
AU - Wang, Zhiqin
AU - Zhang, Jianhua
AU - Yang, Jianchang
AU - Zhang, Hao
N1 - Funding Information:
This work was funded by the National Natural Science Foundation of China (31871559, 32071944, 32272197), the Six Talent Peaks Project in Jiangsu Province (SWYY-151), the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the Interdisciplinary High Level Youth Support Project of Yangzhou University (2021), the Hong Kong Research Grants Council (GRF 14177617, 12103219, 12103220, AoE/M-403/16), and State Key Laboratory of Agrobiotechnology (Strategic Collaborative Projects) of the Chinese University of Hong Kong.
Publisher Copyright:
© 2022 by the authors.
PY - 2022/10
Y1 - 2022/10
N2 - Understanding the performance of rice (Oryza sativa L.) agronomic traits and efficiency in water usage as well as grain yield under various irrigation regimes is crucial to achieving high resource use efficiency and high yield. In this study, 12 mid-season indica rice genotypes that have been grown in the lower reaches of the Yangtze River for the past 80 years were studied in a field experiment for two years under two irrigation regimes, i.e., conventional irrigation (CI) and alternate wetting and drying irrigation (AWD). The results showed that with genotype improvement in irrigation regimes, the total number of spikelets, shoot and root dry weight, root oxidation activity, total leaf area index (LAI), effective LAI, leaf photosynthetic rate, and abscisic acid contents and zeatin + zeatin riboside contents in root bleeding sap were significantly increased at main growth stages. AWD irrigation synchronously increased rice resource use efficiency (water use efficiency (WUE), radiation use efficiency (RUE), and temperature use efficiency (TUE)) and grain yield. Compared to CI, AWD more significantly enhanced the performances of rice genotypes in all studied traits. Based on our findings, a semi-dwarf hybrid rice genotype has great potential for high resource use efficiency and high yield under alternate wetting and drying irrigation, which was attributed to the improved agronomic characteristics and superior root traits.
AB - Understanding the performance of rice (Oryza sativa L.) agronomic traits and efficiency in water usage as well as grain yield under various irrigation regimes is crucial to achieving high resource use efficiency and high yield. In this study, 12 mid-season indica rice genotypes that have been grown in the lower reaches of the Yangtze River for the past 80 years were studied in a field experiment for two years under two irrigation regimes, i.e., conventional irrigation (CI) and alternate wetting and drying irrigation (AWD). The results showed that with genotype improvement in irrigation regimes, the total number of spikelets, shoot and root dry weight, root oxidation activity, total leaf area index (LAI), effective LAI, leaf photosynthetic rate, and abscisic acid contents and zeatin + zeatin riboside contents in root bleeding sap were significantly increased at main growth stages. AWD irrigation synchronously increased rice resource use efficiency (water use efficiency (WUE), radiation use efficiency (RUE), and temperature use efficiency (TUE)) and grain yield. Compared to CI, AWD more significantly enhanced the performances of rice genotypes in all studied traits. Based on our findings, a semi-dwarf hybrid rice genotype has great potential for high resource use efficiency and high yield under alternate wetting and drying irrigation, which was attributed to the improved agronomic characteristics and superior root traits.
KW - grain yield
KW - irrigation regime
KW - rice
KW - water use efficiency
UR - http://www.scopus.com/inward/record.url?scp=85141866307&partnerID=8YFLogxK
U2 - 10.3390/agriculture12101647
DO - 10.3390/agriculture12101647
M3 - Journal article
AN - SCOPUS:85141866307
SN - 2077-0472
VL - 12
JO - Agriculture (Switzerland)
JF - Agriculture (Switzerland)
IS - 10
M1 - 1647
ER -
