|Title:||缺水及鹽分對水稻生產之影響||Other Titles:||Effects of Drought and Salt Stress on Rice Production||Authors:||劉麗飛
|Keywords:||水稻;缺水;鹽害;滲透壓調節;轉殖水稻;Rice;Drought;Salt stress;Osmotic adjustment;Transgenic rice||Issue Date:||Jun-1999||Publisher:||農業試驗所||Related Publication(s):||Environment and Rice Production||Start page/Pages:||87-103||Source:||環境與稻作生產||Abstract:||
Drought and salt stress are two major constraints to rice production and yield stability in many regions on earth. In general, rolled leaves and closed stomata were easily found under drought stress. Accumulation of Na, decreasing of photosynthesis and enhancing of senescence were also found when plants were subjected to salt stress. Rice plant is most sensitive to both stress during reproductive stage. Loss of grain set and yield is tightly associated with the failure of panicle to exsert from the flag leaf, the reduced floret number and the lower pollen fertility. Several drought / salt-resistance mechanisms have been identified for rice: (1) drought escape via appropriate phenology, (2) moderated water-use through morphological changes, (3) the capacity for osmotic adjustment, and (4) efficiently devoid the ion toxicity. In the past, the breeding for both stress tolerance was slowly progressed because the complexity and the involvement of multi genes in drought / salt-resistance. However, recent development of molecular linkage markers for root traits and osmotic adjustment as well as transgenic techniques offer new opportunities for drought I salt-resistance breeding.
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