Salinity Effects on Seedling Growth and Yield Components of Rice

作者：Linghe Zeng, Michael C. Shannon · 发表于：Crop Science · 年份：2000 · DOI：10.2135/cropsci2000.404996x · 被引用次数：491 · 研究领域：Plant Stress Responses and Tolerance、Rice Cultivation and Yield Improvement、Aluminum toxicity and tolerance in plants and animals

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 significantl...