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Regulation of the uptake and distribution of Na+ in shoots of rice (Oryza sativa) variety Pokkali: role of Ca2+ in salt tolerance response

质外体 开枪 水稻 盐度 植物 园艺 蒸腾流 生物 化学 蒸腾作用 细胞壁 光合作用 生物化学 生态学 基因
作者
Veena S. Anil,Pannaga Krishnamurthy,Sam Kuruvilla,K. Sucharitha,George Thomas,M.K. Mathew
出处
期刊:Physiologia Plantarum [Wiley]
卷期号:124 (4): 451-464 被引量:79
标识
DOI:10.1111/j.1399-3054.2005.00529.x
摘要

Soil salinity is a major factor affecting crop productivity worldwide. This study explores mechanisms that contribute to salt tolerance in rice ( Oryza sativa L.). Hydroponically grown, 2‐week‐old salt tolerant and sensitive indica rice varieties, Pokkali and Jaya, respectively, were exposed to a 48‐h stress period with NaCl (0–250 m M ). When exposed to 200 m M NaCl, micromolar levels of external Ca 2+ elevated survival of both varieties. The Ca 2+ levels required were lower for Pokkali than for Jaya, but resulted in significantly higher survival. Estimates of Na + and K + in root and shoot compartments were made by flame photometry, while X‐ray microanalysis was used to localize Na + in the extracellular matrix of the shoot. Transpirational bypass flow was estimated using the apoplastic tracer, 8‐hydroxypyrene‐1,3,6‐trisulphonic acid, trisodium salt. Our data demonstrate a Ca 2+ ‐dependent reduction in Na + transport to shoots, which correlated with a decline in bypass flow and of Na + in the transpirational stream. In addition, the Na + that enters the shoot is partitioned among several distinct compartments. Survival is inversely correlated with Na + levels in the shoot apoplastic fluid, which surrounds the cell and influences cytosolic composition. Pokkali maintained lower Na + in its apoplast compared with the salt sensitive Jaya at the same total shoot Na + . Na + in the apoplast appears to be regulated by sequestration into intracellular compartments. This sink supplements the primary response of reducing Na + influx into the shoot and effectively buffers the apoplastic fluid in Pokkali. All of these mechanisms are operational in Jaya as well but are deployed less effectively.
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