CHARACTERIZATION OF ROOT MORPHOLOGY IN CONTRASTING GENOTYPES OF SORGHUM AT LOW AND HIGH PHOSPHORUS LEVEL

Autor: MICHEL CASTTELANI DA ROCHA, GLAUCO VIEIRA MIRANDA, MARIA JOSÉ VILAÇA VASCONCELOS, PAULO CÉSAR MAGALHÃES, GERALDO AFONSO DE CARVALHO JÚNIOR, LIDIANNE ASSIS SILVA, MARCELO OLIVEIRA SOARES, FERNANDO RODRIGO OLIVEIRA CANTÃO, FABRÍCIO RODRIGUES, ROBERT EUGENE SCHAFFERT
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Revista Brasileira de Milho e Sorgo, Vol 9, Iss 1, Pp 65-78 (2010)
Druh dokumentu: article
ISSN: 1676-689X
1980-6477
Popis: Low availability of phosphorus in the soil is one of the principal limiting factors in plant development and plant production. Plants have developed adaptive mechanisms for these environments that vary among species and genotypes within a species. The capacity of plants to explore the soil, transform unusable P forms to usable forms, develop relationships with mycorrhiza fungi, among other traits, influence the plant efficiency in these environments. The objective of this study was to evaluate morphological root characteristics related to mechanisms of phosphorus acquisition in sorghum lines of the sorghum improvement program at Embrapa. Nine lines were used to study the root system in a soil with two levels of phosphorus (5 and 20 mg dm-3). For this characterization a WinRhizo v. 4.0 image analyzer was used. Genetic variability was observed at low phosphorus levels for total root length, very fine root length, fine root length, total root surface area, root surface area of very fine root, root surface area of fine root and number of root branches, suggesting that different mechanisms of phosphorus acquisition may be occurring in environments with low and high phosphorus availability. Root length and root surface area appear to be more important for plant adaptation to low phosphorus levels than root volume and root diameter. Specific root length and root tissue density were the most useful parameters related to plant productivity at low phosphorus. These characteristics could be useful parameters for selection in sorghum improvement programs.
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