当前位置: X-MOL 学术J. Plant Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Species-specific nitrogen resorption proficiency in legumes and nonlegumes.
Journal of Plant Research ( IF 2.8 ) Pub Date : 2020-07-04 , DOI: 10.1007/s10265-020-01211-1
Shimpei Oikawa 1 , Yusuke Matsui 1 , Michio Oguro 2 , Masanori Okanishi 3 , Ryo Tanabe 1 , Tomoki Tanaka 1 , Ayaka Togashi 1 , Tomoyuki Itagaki 4
Affiliation  

Nitrogen (N) resorption from senescing leaves enables plants to reuse N, thereby making them less dependent on current N uptake from the environment. Therefore, N resorption is important for survival and fitness, particularly for plants growing under low N supply. We studied N resorption from senescing leaves of 25 legumes and 25 nonlegumes in a temperate region of Japan to test the hypothesis that high N resorption has not evolved in legumes that fix atmospheric N2. The extent of N resorption was quantified by N resorption proficiency that is measured as the level to which leaf N concentration was reduced during senescence, i.e., the lower the senesced leaf N concentration, the lower the N loss through leaf fall and higher the N resorption proficiency. In support of the hypothesis, senesced leaf N concentration was higher in legumes than in nonlegumes, but there was considerable overlap between the groups. The higher senesced leaf N concentration of legumes was associated with a lower proportion of leaf N resorbed during senescence, particularly in species with higher leaf N concentrations. According to a hierarchical partitioning analysis, there was a large contribution of species to the total variance in the senesced leaf N concentration as opposed to a minor contribution of functional group (legume/nonlegume). This study reveals that legumes are not proficient at resorbing N from senescing leaves but that N2-fixation might not be the single most important determinant of N resorption.



中文翻译:

豆类和非豆类中特定物种的氮吸收能力。

衰老叶片中的氮(N)吸收使植物能够再利用N,从而使植物对环境中当前N吸收的依赖性降低。因此,氮的吸收对于生存和适应性,特别是对于氮供应低下生长的植物而言,是重要的。我们研究了日本温带地区25种豆科植物和25种非豆科植物的衰老叶片中的N吸收,以检验在固定大气N 2的豆科植物中未发生高N吸收的假设。。N吸收的程度通过N吸收能力来量化,N吸收能力是通过测量衰老过程中叶片N浓度降低的水平来衡量的,即,降低的叶片N浓度越低,通过落叶而损失的N越低,并且N吸收越高熟练程度。为支持该假设,豆科植物的感性叶片氮浓度高于非豆科植物,但各组之间存在相当大的重叠。豆科植物衰老的叶片中较高的叶片N浓度与衰老期间吸收的叶片N的较低比例有关,特别是在叶片N浓度较高的物种中。根据层次划分分析,物种对衰老叶片氮浓度总变化的贡献很大,而功能组(豆类/非豆类)的贡献很小。这项研究表明,豆类不能熟练地吸收衰老叶片中的氮,但是氮2-固定可能不是氮吸收的最重要的唯一决定因素。

更新日期:2020-07-05
down
wechat
bug