Light activates H215O flow in rice:: Detailed monitoring using a positron-emitting tracer imaging system (PETIS)
Light activates H215O flow in rice:: Detailed monitoring using a positron-emitting tracer imaging system (PETIS)
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DOI：
10.1034/j.1399-3054.2001.1130309.x
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发表时间：
2001-11-01
影响因子：
6.4
通讯作者：
Mori, S
中科院分区：
文献类型：
--
作者：
Kiyomiya, S;Nakanishi, H;Mori, S
水（（H_2O）-O-15）从水稻根向顶部的转移。EV.通过正电子发射示踪剂成像系统（PETIS）随时间可视化。（H2O）-O-15流在植物暴露于强光（1500 μ mol m（-2）s（-1））后8分钟被激活。当随后去除光时，流动逐渐减慢并在12 min后完全停止。在暴露于低光（500 pmol m（-2）s（-1））的植物中，（H2O）-O-15流动被激活得更慢，并且在下一个黑暗期结束时在相同的低光下观察到更高的（H2O）-O-15转运速率。NaCl（80 mM）和甲基汞（1 mM）直接抑制根系对（H2O）-O-15的吸收，而蛋氨酸亚砜亚胺（1 mM）、脱落酸（10 μ M）和羰基氰间氯苯腙（10 mM）则被运输到叶片，促进气孔关闭，减少（H2O）-O-15的转运。
Water ((H2O)-O-15) translocation from the roots to the top of rice plants (Oryza saliva L. ev. Nipponbare) was visualized over time by a positron-emitting tracer imaging system (PETIS). (H2O)-O-15 flow was activated 8 min after plants were exposed to bright light (1500 mu mol m(-2) s(-1)). When the light was subsequently removed, the flow gradually slowed and completely stopped after 12 min. In plants exposed to low light (500 pmol m(-2) s(-1)), (H2O)-O-15 flow was activated more slowly, and a higher translocation rate of (H2O)-O-15 was observed in the same low light at the end of the next dark period. NaCl (80 mM) and methylmercury (1 mM) directly suppressed absorption of (H2O)-O-15 by the roots, while methionine sulfoximine (1 mM), abscisic acid (10 muM) and carbonyl cyanide m-chlorophenylhydrazone (10 mM) were transported to the leaves and enhanced stomatal closure, reducing (H2O)-O-15 translocation.