Chinese Journal OF Rice Science >
Morphological and Physiological Responses of Rice Seedlings to Water Temperature Under Complete Submergence
Received date: 2015-12-29
Revised date: 2016-03-12
Online published: 2016-09-10
To reveal the effects of floodwater temperature on morphology and physiology of rice seedlings, rice genotypes with different submergence tolerance were used: IR64Sub1 (tolerant), IR42 (sensitive), Gangyou 725 and Taiyou 398 (main cultivar). Seedlings were submerged twenty-five days after sowing at two water temperature for 0, 3, 6, 9 and 12 days. The results showed that the oxygen concentration in the 20℃ floodwater was higher than that in 30℃ floodwater, the oxygen concentration decreased drastically in 30℃ floodwater than 20℃ floodwater with in creasing submergence days. The shoot elongation percentage was higher when seedlings were submerged in 30℃ floodwater than 20℃ floodwater condition. The same response was found in the tolerant variety IR64Sub1, but the shoot elongation percentage was the lowest among four varieties. The difference in shoot elongation of IR42 between two floodwater temperature was biggest after 9-day and 12-day submergence. Non-structural carbohydrate concentrations and leaf SPAD value were lower under 30℃ floodwater temperature than 20℃temperature floodwater condition. This findings help to understand the cause of high survival of rice submerged in low temperature floodwater.
Jing XIANG, Hui-zhe CHEN, Yu-ping ZHANG, Yi-kai ZHANG, De-feng ZHU . Morphological and Physiological Responses of Rice Seedlings to Water Temperature Under Complete Submergence[J]. Chinese Journal OF Rice Science, 2016 , 30(5) : 525 -531 . DOI: 10.16819/j.1001-7216.2016.5183
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