e-journal

Glyphosate-Resistant Italian Ryegrass (Lolium perenne) Populations also Exhibit Resistance to Glufosinate

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Resistance to glufosinate has been confirmed in glyphosate-resistant Italian ryegrass populations collected in hazelnut orchards in Oregon. Dose–response, ammonia accumulation, and enzyme activity studies were conducted to test the sensitivity of three glyphosate-resistant and three susceptible Italian ryegrass populations to glufosinate. The glufosinate rates required to reduce the growth by 50% (GR50) were 0.15, 0.18, and 0.21 for the control populations C1, C2, and C3, respectively, whereas for the resistant populations OR1, OR2, and OR3, the GR50 values were 0.49, 0.42, and 0.40 kg ai ha-1, respectively, exhibiting an average resistance index of 2.4. The same trend was observed in ammonia accumulation studies between 48 and 96 h after glufosinate treatment where the susceptible populations accumulated on average two times more ammonia than the resistant populations. The glufosinate concentration required to reduce the glutamine synthetase enzyme activity by 50% (I50) was not different for the resistant and susceptible populations. The I50s ranged from 3.1 to 3.6 μM for the resistant populations and from 3.7 to 4.3 μM for the susceptible populations; therefore, an insensitive target site is not responsible for the glufosinate resistance.

Nomenclature: Glufosinate; glyphosate; Italian ryegrass, Lolium perenne L. ssp. multiflorum (Lam.) Husnot LOLMU; hazelnut, Corylus avellana L.

Key words: Glutamine synthetase, ammonia accumulation, herbicide resistance.

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Ketersediaan

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Informasi Detail

Judul Seri

Weed Science

No. Panggil

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Penerbit

New York : Weed Science Society America., 2011

Deskripsi Fisik

Weed Science 2011 59:305–309

Bahasa

English

ISBN/ISSN

DOI: 10.1614/WS-D-11

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2011 59

Subjek

PERTANIAN.
ILMU GULMA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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