Rhizome transition to storage organ is under phytochrome control in lotus (Nelumbo nucifera)
Rhizome transition to storage organ is under phytochrome control in lotus (Nelumbo nucifera)
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DOI：
10.1007/s00425-007-0536-9
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发表时间：
2007-05
期刊：
影响因子：
4.3
通讯作者：
J. Masuda;Y. Ozaki;H. Okubo
中科院分区：
文献类型：
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作者：
J. Masuda;Y. Ozaki;H. Okubo
我们用种子植物研究了荷花根茎形态发生(向贮藏器官的转变)的光周期反应。光周期为8、10、12h时，根茎膨大(周长)，而光周期为13、14h时，根茎伸长。在14h的光照条件下，根茎伸长，即8h的自然光加上6h的白光、黄光或红光，但类似的蓝光、绿光或远红光处理会导致根茎的周长增大。在光照周期为8小时的植物中，白光、黄光或红光中断2小时可使根茎伸长，而2小时蓝、绿或远红光夜间休息仍可导致根茎周长增加。红光夜间休息对根茎周长的抑制作用被随后立即给予的远红光(FR)逆转。R/FR/R照射抑制了根茎周长的增加。R/FR/R照射后的FR光照射抵消了最后一次R光照射的影响。结果表明，根茎向贮藏器官转化的临界光周期为12~13h。中断暗周期(夜间)的最佳光质范围在黄光和红光之间，并且观察到R/FR可逆反应。根据这些结果，我们认为光敏色素在荷花根茎周长增加的光周期反应中起着重要作用。这是关于根状茎植物贮藏器官光敏色素依赖的形态发生的首次报道。
We examined photoperiodic response of lotus (Nelumbonucifera) rhizome morphogenesis (its transition to a storage organ) by using seed-derived plants. Rhizome enlargement (increase in girth) was brought about under 8, 10 and 12 h photoperiods, whereas the rhizomes elongated under 13 and 14 h photoperiods. Rhizomes elongated under 14 h light regimes supplied as 8 h of natural light plus 6 h supplemental hours of white, yellow or red light, but similar treatments with supplemental blue, green or far red light, caused enlargement in girth of the rhizomes. A 2 h interruption of the night with white, yellow or red light, in plants entrained to 8 h photoperiod brought rhizome elongation, whereas 2 h-blue, green or far red light night breaks still resulted in rhizome increase in girth. The inhibitory effect of a red (R) light night break on rhizome increase in girth was reversed by a far-red (FR) light given immediately afterwards. Irradiation with R/FR/R inhibited the rhizome increase in girth. FR light irradiation following R/FR/R irradiation cancelled the effect of the last R light irradiation. It was demonstrated that the critical photoperiod for rhizome transition to storage organ is between 12 and 13 h photoperiod. It was also evident that the optimal light quality range for interruption of dark period (night break) is between yellow and red light and that a R/FR reversible reaction is observed. From these results, we propose that phytochrome plays an important role in photoperiodic response of rhizome increase in girth in lotus. This is the first report on phytochrome-dependent morphogenesis of storage organs in rhizomous plants.