Chemical properties of humic matter as related to induction of plant lateral roots

被引：76

作者：

Canellas, L. P. ^{[1
]}

Dobbss, L. B. ^{[1
]}

Oliveira, A. L. ^{[2
]}

Chagas, J. G. ^{[1
]}

Aguiar, N. O. ^{[1
]}

Rumjanek, V. M. ^{[3
]}

Novotny, E. H. ^{[4
]}

Olivares, F. L. ^{[1
]}

Spaccini, R. ^{[5
,6
]}

Piccolo, A. ^{[5
,6
]}

机构：

[1] Univ Estadual Norte Fluminense Darcy Ribeiro UENF, Nucleo Desenvolvimento Insumos Biol Agr Nudiba, BR-28602013 Ribeirao Preto, Brazil

[2] Lab Quim Nucleo Criminalist Superintendencia Poli, BR-20081250 Rio De Janeiro, Brazil

[3] Univ Fed Rural Rio de Janeiro, Dept Quim, BR-23890000 Seropedica, RJ, Brazil

[4] Embrapa Solos, BR-22460000 Rio De Janeiro, Brazil

[5] Univ Napoli Federico II, Dipartimento Sci Suolo Pianta Ambiente & Prod Ani, I-80055 Portici, Italy

[6] Univ Napoli Federico II, Ctr Interdipartimentale Risonanza Magnet Nucl CER, I-80055 Portici, Italy

来源：

EUROPEAN JOURNAL OF SOIL SCIENCE | 2012年 / 63卷 / 03期

关键词：

ORGANIC-CARBON; ACIDS; SUBSTANCES; ELONGATION; FRACTIONS; GROWTH; SOILS; BIOACTIVITY; COMPOST;

D O I：

10.1111/j.1365-2389.2012.01439.x

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

A series of humic matter samples isolated from a soil sequence, different oxisols, size-fractionated from a vermicompost humic acid and subjected to chemical modifications, were characterized by CPMAS 13C-NMR spectroscopy. The relative signal areas in chemical shift regions of NMR spectra of the four sets of samples were analysed by principal component analysis (PCA). Hierarchical cluster analysis (HCA) was applied to build a classification model, which allowed the recognition of humic matter according to its origin. The relationship between carbon species and biological activity of humic acids, as promoters of lateral root emergence, was obtained by applying PLS multivariate analysis. This showed that lateral root emergence was mostly related to NMR parameters such as the hydrophobicity index (HB/HI) and the 40110 and 160200 ppm chemical shift regions (hydrophilic carbon HI), while the content of hydrophobic (HB) carbon in humic samples was negatively correlated with induction of lateral root hair. Our results represent a step further in the structure-bioactivity relationship of natural humic substances and confirm their role as plant root growth promoters.

引用

页码：315 / 324

页数：10

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