Salinity Effects on Seedling Growth and Yield Components of Rice
By L. Zeng, M. Shannon. 2000
524 citations recorded by the source corpus.
Flood irrigation practices that are commonly used in California during the early stages of rice (Oryza sativa L.) establishment may contribute to salinity damage and eventually decrease yield. Knowledge of salinity effects on rice seedling growth and yield components would improve management practices in fields and increase our understanding of salt tolerance mechanisms in rice. Salinity sensitivity of rice was studied to determine salinity effects on seedlings and yield components. Plants of rice cultivar M-202 were grown in a greenhouse in sand and irrigated with nutrient solutions of control and treatments amended with NaCl and CaCl 2 (2:1 molar concentration) at 1.9, 3.4, 4.5, 6.1, 7.9, and 11.5 dS m -1 electrical conductivity. Shoot dry weights of seedlings were measured at five harvests in the first month after seeding. Seedling growth was significantly reduced by salinity at the lowest salinity treatment, 1.9 dS m -1 . At 1.9 and 3.4 dS m -1 , significant reduction of seedling growth occurred at longer cumulative thermal time than at higher salt levels. Seedling survival was significantly reduced when salinity was 3.40 dS m -1 and higher. Highly significant linear responses of grain weight per plant, grain weight per panicle, spikelet number per panicle, and tiller number per plant to salinity were observed. There was a common lowest salt level for fertility and pollen germination beyond which they were significantly reduced by salinity. Harvest index was significantly decreased when salinity was at 3.40 dS m -1 and higher. Tiller number per plant and spikelet number per panicle contributed the most variation in grain weight per plant under salinity. Reductions in seedling survival, tiller number per plant, and spikelet number per panicle were the major causes of yield loss in M-202 under salinity. The compensation between spikelets and other yield components was confounded with salinity effects, but was believed to be minor relative to the reduction of spikelets due to salinity and, therefore, not sufficient to offset yield loss even at moderate salt levels.
Subfields: Plant Science
View Paper: https://www.semanticscholar.org/paper/9ff0b97f386572fb5ed35526d83de5532e092d15
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Plant Science
Citations in the corpus
- Evaluation of salt tolerance in rice genotypes by physiological characters (2004, background): “Tillers per plant and spikelets per panicle were the most salinity-sensitive yield components in rice cultivar M- 202 ( Zeng & Shannon, 2000 ) and are determined at vegetative and panicle initiation stages, respectively (Hoshikawa, 1989).”
- Comprehensive Evaluation of Salt Tolerance in Rice (Oryza sativa L.) Germplasm at the Germination Stage (2021, background): “Rice is a glycophytic plant, and salt stress has adverse effects on rice growth and yield, which depend on crop stages, stress severity and duration, and the tolerance of the rice variety [8].”
- Sugar accumulation, photosynthesis and growth of two indica rice varieties in response to salt stress (2009, unknown): “conductivity (EC) and soil salinity ( Zeng and Shannon 2000 ).”
- Salt stress induced ion accumulation, ion homeostasis, membrane injury and sugar contents in salt-sensitive rice (Oryza sativa L. spp. indica) roots under iso- osmotic conditions (2011, background): “65 dS m -1 electrical conductivity (EC) of salinity (Zeng and Shannon, 2000).”
- A Comparison of Screening Criteria for Salt Tolerance in Wheat under Field and Controlled Environmental Conditions (2009, background): “For instance, Zeng and Shannon (2000) reported that the threshold values of salinity on pollen germination and fertility were both between 4.5 and 6.1 dS m)1, respectively.”
- Performance of four irrigated rice varieties under different levels of salinity stress. (2009, background): “Rice (Oryza sativa L.) is rated as one of the major food crops in the world, but is also considered extremely salt-sensitive (Maas and Hoffman, 1977).”
- Response of Rice under Salinity Stress: A Review Update (2016, background): “Evaluation of different cultivars was precised at morpho-physiological level by estimating parameters like tiller number, leaf area, panicle length, root length, biomass, dry weight, RGR (Relative Growth Rate), RWC (Relative Water Content) [16,52,70-72].”
- Evaluating physiological responses of plants to salinity stress (2016, background): “Plausible reasons for changes in HI may include a lower shoot biomass reduction, maintenance of tiller number (Zeng and Shannon, 2000) or earlier flowering (Saade et al., 2016).”
- Effect of glycinebetaine on proline, water use, and photosynthetic efficiencies, and growth of rice seedlings under salt stress (2010, background): “65 dS m electrical conductivity (EC) of salinity (Zeng and Shannon 2000).”
- Recent Updates on Salinity Stress in Rice: From Physiological to Molecular Responses (2011, background): “In rice, salinity affects yield components such as panicle length, spikelet number per panicle, and grain yield (Zeng and Shannon, 2000), and it also delays panicle emergence and flowering (Khatun and Flowers, 1995).”