Short photoperiod induces dormancy in lotus (Nelumbo nucifera)
Short photoperiod induces dormancy in lotus (Nelumbo nucifera)
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DOI：
10.1093/aob/mcj008
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发表时间：
2006-01-01
期刊：
影响因子：
4.2
通讯作者：
Okubo, H
中科院分区：
文献类型：
--
作者：
Masuda, JI;Urakawa, T;Okubo, H
中心点 背景和目标 莲花 (Nelumbo nucifera) 在日本作为观赏植物和食用植物栽培已有 1000 多年的历史。由于其栽培需要大面积（每株植物约 2 m(2)），因此直到最近才对环境因素对休眠的影响等生理学研究进行深入研究。本文利用幼苗来研究影响休眠诱导的环境因素。center dot 方法在第一个实验中，从4月6日到10月6日每隔两个月播种种子，并在不加热的温室中培养2个月。在第二个实验中，种子在11月16日和5月16日准备发芽，幼苗在25或30摄氏度的自然日照下在植物生长室中生长。 1个月后，将幼苗在20、25或30℃下再培养一个月。两个实验培养 2 个月后，计算主茎上的叶子和根茎分枝的数量，并使用根茎膨大指数（=最大节间直径/节间长度）计算主茎上根茎的生长情况。中心点关键结果 4 月和 6 月播种种子时，根茎伸长，但没有膨大。八月和十月播种，根茎分别从第十和第五节间膨大。根茎在 11 月播种时增大，但在 5 月播种时伸长，与植物温室中自然日照下的温度处理无关。 5月份在25-30℃培养2个月的幼苗比11月份培养的幼苗叶片更多，根茎分枝和节也更多。center dot结论短日照导致荷花诱导休眠。
center dot Background and Aims Lotus (Nelumbo nucifera) has been cultivated as an ornamental and food plant in Japan for more than 1000 years. As large areas are required for its cultivation (approximately 2 m(2) per plant), physiological research, such as into the effect of environmental factors on dormancy, has not been well studied until recently. In this paper, seedlings were used to examine environmental factors affecting dormancy induction.center dot Methods In a first experiment, seeds were sown from 6 April to 6 October at 2-month intervals, and cultivated for 2 months in an unheated greenhouse. In a second experiment, seeds were prepared for germination on 16 November and 16 May and the seedlings were grown at 25 or 30 degrees C under natural daylength in phytotron growth rooms. After 1 month, the seedlings were cultivated at 20, 25 or 30 degrees C for a further month. The number of leaves and rhizome branches on the main stem were counted, and growth of rhizomes on the main stem was calculated using a rhizome enlargement index (= maximum internode diameter/internode length) after 2 months of culture in both experiments.center dot Key Results Rhizomes elongated without enlargement when the seeds were sown in April and June. Sowing the seeds in August and October resulted in rhizome enlargement from the tenth and fifth internodes, respectively. Rhizomes enlarged in the November-sowing but elongated in the May-sowing irrespective of temperature treatments under natural daylength in the phytotron rooms. The seedlings cultivated from May at 25-30 degrees C for 2 months had more leaves, and more rhizome branches and nodes than those cultivated from November.center dot Conclusions Short days led to induced dormancy in lotus.