The relative importance of carbohydrate and nitrogen for the resprouting ability of Quercus crispula seedlings
The relative importance of carbohydrate and nitrogen for the resprouting ability of Quercus crispula seedlings
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DOI：
10.1093/aob/mci200
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发表时间：
2005-09-01
期刊：
影响因子：
4.2
通讯作者：
Sakai, S
中科院分区：
文献类型：
--
作者：
Kabeya, D;Sakai, S
背景和目的植物在芽被破坏后需要某种储存的资源来重新发芽。方法采用析因试验设计，在两种光照条件下，对皱皮栎幼苗进行剪梢试验，研究碳水化合物和氮素贮藏水平对皱皮栎幼苗光合能力的影响（40%和3%的全光照）和三种营养浓度（低、中、高）。关键结果（弹簧片展开结束），暴露于40%光照的幼苗根部平均总非结构性碳水化合物（TNC）浓度为17.0%，而对照为4.9%在3%光照条件下，根中TNC的平均含量分别为203.8mg和20.0mg。与此相反，根N浓度平均为2.3%，在3%的光处理的1.2%，在40%的光处理，它增加了养分浓度在两个光照水平的连续上升。无论营养状况如何，在40%光照水平下，> 80%的幼苗在剪枝后重新发芽.然而，很少有幼苗在3%的光照水平下重新发芽，特别是在中营养和高营养的处理。此外，根系TNC浓度和TNC库在重新萌发后均有所下降，但根系N量保持不变。结论碳水化合物贮藏比N贮藏对皱皮栎重新萌发的影响更大。但根中N和TNC含量与新梢大小呈正相关。因此，氮贮量的高低对再萌枝的生长也很重要。
Background and Aims Plants need some kind of stored resources to resprout after shoot destruction. The aim of this study was to determine the relative importance of carbohydrate and nitrogen (N) storage levels for their ability to resprout.Methods A shoot clipping experiment was conducted on Quercus crispula seedlings, which were grown in a factorial experimental design, with two light levels (40 % and 3 % of full light) and three nutrient concentrations (low, medium and high).Key Results At the time of shoot clipping (the end of spring leaf expansion), seedlings exposed to 40 % light had an average total non-structural carbohydrate (TNC) concentration of 17.0 % in their roots compared with 4.9 % in the roots of seedlings exposed to 3 % light, and the average amount of TNC (TNC pools) in the roots was 203.8 mg and 20.0 mg at 40 % light and 3 % light, respectively. In contrast, root N concentration averaged 2.3 % in the 3 % light treatment compared with 1.2 % in the 40 % light treatment, and it increased with successive rises in nutrient concentrations at both light levels. Regardless of the nutrient status, at the 40 % light level > 80 % of the seedlings resprouted after shoot clipping. Few seedlings, however, resprouted at the 3 % light level, particularly in the medium- and high-nutrient treatments. Furthermore, both root TNC concentrations and TNC pools decreased after resprouting, but the amount of root N remained constant.Conclusions These results suggest that carbohydrate storage has a stronger influence on resprouting in Quercus crispula than N storage. However, the size of the resprouting shoot was positively correlated with the amount of both N and TNC in roots. The level of N storage is, therefore, also important for the growth of resprouting shoots.