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Effects of early mycorrhization and colonized root length on low-soilphosphorus resistance of West African pearl millet

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Phosphorus (P) deficiency at early seedling stages is a critical determinant for survival and final
yield of pearl millet in multi-stress Sahelian environments. Longer roots and colonization with arbuscular
mycorrhizal fungi (AMF) enhance P uptake and crop performance of millet. Assessing
the genotypic variation of early mycorrhization and its effect on plant growth is necessary to better
understand mechanisms of resistance to low soil P and to use them in breeding strategies for
low P. Therefore, in this study, eight pearl millet varieties contrasting in low-P resistance were
grown in pots under low P (no additional P supply) and high P (+ 0.4 g P pot–1) conditions, and
harvested 2, 4, 6, and 8 weeks after sowing (WAS). Root length was calculated 2 WAS by scanning
of dissected roots and evaluation with WinRhizo software. AM infection (%) and P uptake
(shoot P concentration multiplied per shoot dry matter) were measured at each harvest. Across
harvests under low P (3.3 mg Bray P kg–1), resistant genotypes had greater total root length infected
with AMF (837 m), higher percentage of AMF colonization (11.6%), and increased P uptake
(69.4 mg P plant–1) than sensitive genotypes (177 m, 7.1% colonization and 46.4 mg P
plant–1, respectively). Two WAS, resistant genotypes were infected almost twice as much as
sensitive ones (4.1% and 2.1%) and the individual resistant genotypes differed in the percentage
of AMF infection. AMF colonization was positively related to final dry matter production in pots,
which corresponded to field performance. Early mycorrhization enhanced P uptake in pearl millet
grown under P-deficient conditions, with the genotypic variation for this parameter allowing selection
for better performance under field conditions.

Key words: acid soils / arbuscular mycorrhizal fungi / P deficiency / P-acquistion efficiency

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Informasi Detail

Judul Seri

Journal Plant Nutrition Soil Science

No. Panggil

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Penerbit

London : WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim., 2016

Deskripsi Fisik

J. Plant Nutr. Soil Sci. 2016, 179, 466–471

Bahasa

English

ISBN/ISSN

10.1002/jpln.2015005

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2016, 179

Subjek

PERTANIAN.

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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