Chinese Journal OF Rice Science >
Grain-filling Characteristics and Its Relationship with Grain Yield Formation of japonica Rice Nanjing 9108 Under Combined Salinity-drought Stress
Received date: 2024-05-29
Revised date: 2024-10-15
Online published: 2025-05-21
【Objective】This study aims to investigate the effects of combined salinity-drought stress on rice grain-filling characteristics and its relationship with yield formation.【Method】The study was conducted with conventional japonica rice cultivar Nanjing 9108, which is widely cultivated in the coastal saline soil of Jiangsu Province, China. The experimental design consisted of factorial combinations of salinity and drought stresses: salinity stress induded non-salinity (NS, salt concentration 0%) and high-salinity stress (HS, salt concentration 0.3%); while drought regimes comprised well-watered (WW), moderate drought (MD), and severe drought (SD) treatments from jointing stage to heading stage.【Result】Compared with non-stress, 1) the yield reduction under salinity stress, drought stress, and combined salinity-drought stress was 36.8%, 13.7%−30.0%, and 60.3%−107.1%, respectively (two-year average). 2) the number of panicles per unit area, grains per panicle, seed setting rate, and the thousand-grain weight were all lower under single salinity stress, single drought stress, and combined salinity-drought stress, and the reduction was greater under combined salinity-drought stress; the panicle length, and grain weight and seed setting rate of superior and inferior grains showed a similar trend. 3) single salinity stress, single drought stress, and combined salinity-drought stress significantly reduced dry matter weight at jointing and heading and the accumulation of dry matter weight from heading to maturity, as well as leaf photosynthetic rate and SPAD value at 20 and 40 days after heading; the reductions under combined salinity-drought stress were greater than those under single salinity and single drought stress. 4) the maximum grain-filling rate and the mean grain-filling rate of superior and inferior grains were lower under single salinity stress, single drought stress, and combined salinity-drought stress, while the time to reach the maximum grain-filling rate and the effective grain-filling period of superior grains showed an increasing trend, and the differences in the time to reach the maximum grain-filling rate and the effective grain-filling period of inferior grains were smaller. The number of days in the early, middle, and late periods were greater under single salinity stress, single drought stress, and combined salinity-drought stress, while lower for the mean grain-filling rate and grain-filling amount. 5) single salinity stress, single drought stress, and combined salinity-drought stress treatments reduced the activities of key starch synthesis enzymes in grains, especially for AGPase and GBSS enzymes.【Conclusion】This study demonstrats that the grain-filling rate and key starch synthesis enzyme activities of superior and inferior grains decreased significantly and the grain-filling characteristics of superior and inferior grains were deteriorated under single salinity stress, single drought stress, and especially combined salinity-drought stress. The inhibitory effects of combined salinity-drought stress on the grain-filling rate, grain-filling amount of superior and inferior grains, and grain yield were greater than single salinity and drought stress.
WEI Huanhe, WANG Lulu, MA Weiyi, ZHANG Xiang, ZUO Boyuan, GENG Xiaoyu, ZHU Wang, ZHU Jizou, MENG Tianyao, CHEN Yinglong, GAO Pinglei, XU Ke, DAI Qigen . Grain-filling Characteristics and Its Relationship with Grain Yield Formation of japonica Rice Nanjing 9108 Under Combined Salinity-drought Stress[J]. Chinese Journal OF Rice Science, 2025 , 39(3) : 373 -386 . DOI: 10.16819/j.1001-7216.2025.240515
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