e-journal

Morpho-anatomical adaptations to waterlogging by germplasm accessions in a tropical forage grass

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Abstract.
Soil waterlogging reduces gas exchange between the soil and the atmosphere, leading to oxygen deprivation
in the rhizosphere. Brachiaria spp. arethemostwidelysownforagegrasses in tropical America.Amongcommercial
Brachiaria grasses, B. humidicola shows superior tolerance to waterlogged soils based on maintenance of growth and reduced leaf chlorophyll loss and senescence. However, little is known about the underlying traits of waterlogging tolerance in B. humidicola or their intraspecific variation. For this purpose, an outdoor study was conducted using 12 germplasm accessions of B. humidicola that were grown in soil cylinders under drained or waterlogged soil conditions for 21 days. Dry mass production and morpho-anatomical responses (aerenchyma in shoots and roots, root diameter, proportional area of stele in roots,numberof nodal andlateral roots, andlength of the longest root) were determined. All accessions showed shorter roots and reduced root dry mass under waterlogged soil conditions. All accessions showed aerenchymain shoots androots under drained conditions butwere further increased underwaterlogging. All accessions showed a reduction in the proportional area of stele of roots in response to waterlogging. The accession (CIAT 26570) that showed a higher proportion of aerenchyma in shoots and roots and an increased number of nodal roots (with higher diameter and a reduction in the number of lateral roots) showed longer roots, less reduction in root dry mass and increased shoot growth under waterlogged conditions. We conclude that superior growth of one accession (CIAT
26570) under waterlogged soil conditions is probably a result of morpho-anatomical traits acting together to
enhance root aeration and shoot ventilation. Further research is needed to test the ability to recover fromwaterlogging in B. humidicola accessions.

Keywords: Aerenchyma; Brachiaria humidicola; dry mass production; oxygen deficiency; root penetration; root traits.

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Informasi Detail

Judul Seri

AoB PLANTS

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2013

Deskripsi Fisik

AoB PLANTS 5: plt047; doi:10.1093/aobpla/plt047

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

5: plt047

Subjek

EKOLOGI TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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