Short-term physiological and developmental responses to nitrogen availability in hybrid poplar
Short-term physiological and developmental responses to nitrogen availability in hybrid poplar
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DOI：
10.1111/j.1469-8137.2005.01435.x
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发表时间：
2005-07-01
期刊：
影响因子：
9.4
通讯作者：
Davis, JM
中科院分区：
文献类型：
--
作者：
Cooke, JEK;Martin, TA;Davis, JM
氮肥导致植物的生长和发育发生戏剧性的变化，包括林木。在这项研究中，我们研究了杂交杨对苦杨的短期反应。温室生长的幼树在28天的时间里受到限制、中等和丰富的硝酸铵水平的影响，表现出全株结构和生物量积累的快速变化。与氮相关的分配变化发生在时间上不同的阶段。氮素有效性调节了影响碳增益的参数，包括光饱和净光合作用和叶面积。这些参数受氮素诱导的叶片成熟衰老变化的影响。叶面积也受到氮素诱导的侧枝发育的影响。营养贮藏蛋白和淀粉生物合成酶的编码基因在不同的氮素有效性下表现出不同的表达模式。一个编码果胶甲基酯酶抑制剂的基因显示出与淀粉生物合成基因相似的表达模式。本研究结果表明，香菇具有表型可塑性。三角果毛果表现出对氮素有效性差异的响应。
Nitrogen fertilization induces dramatic changes in the growth and development of plants, including forest trees. In this study we examined short-term responses of hybrid poplar, Populus balsamifera ssp. trichocarpa x deltoides, to N fertilization.Glasshouse-grown saplings subjected to limiting, intermediate, and luxuriant levels of ammonium nitrate over a 28 d time course demonstrated rapid changes to whole-plant architecture and biomass accumulation. Nitrogen-associated shifts in allocation occurred in temporally distinct stages. Nitrogen availability modulated parameters that affect carbon gain, including light-saturated net photosynthesis and leaf area. These parameters were affected by N-induced changes to leaf maturation and senescence. Leaf area was also affected by N-induced sylleptic branch development.Genes encoding vegetative storage proteins and starch biosynthetic enzymes exhibited contrasting patterns of expression under differential N availability. A gene encoding a previously uncharacterized putative pectin methylesterase inhibitor displayed expression patterns comparable to the starch biosynthetic genes.The results of this study illustrate the phenotypic plasticity that P. balsamifera ssp. trichocarpa x deltoides exhibits in response to differential N availability.