e-journal

Elevated CO2 decreases the response of the ethylene signaling pathway in Medicago truncatula and increases the abundance of the pea aphid

---

The performance of herbivorous insects is greatly affected by plant nutritional quality and
resistance, which are likely to be altered by rising concentrations of atmospheric CO2.

We previously reported that elevated CO2 enhanced biological nitrogen (N) fixation of
Medicago truncatula, which could result in an increased supply of amino acids to the pea
aphid (Acyrthosiphon pisum). The current study examined the N nutritional quality and aphid
resistance of sickle, an ethylene-insensitive mutant of M. truncatula with supernodulation,
and its wild-type control A17 under elevated CO2 in open-top field chambers.
Regardless of CO2 concentration, growth and amino acid content were greater and aphid
resistance was lower in sickle than in A17. Elevated CO2 up-regulated N assimilation and
transamination-related enzymes activities and increased phloem amino acids in both genotypes.
Furthermore, elevated CO2 down-regulated expression of 1-amino-cyclopropanecarboxylic
acid (ACC), sickle gene (SKL) and ethylene response transcription factors (ERF)
genes in the ethylene signaling pathway of A17 when infested by aphids and decreased resistance
against aphids in terms of lower activities of superoxide dismutase (SOD), peroxidase
(POD), and polyphenol oxidase (PPO).
Our results suggest that elevated CO2 suppresses the ethylene signaling pathway in
M. truncatula, which results in an increase in plant nutritional quality for aphids and a
decrease in plant resistance against aphids.

Key words: Acyrthosiphon pisum (pea aphid), elevated CO2, ethylene, Medicago truncatula, nitrogen (N) metabolism, resistance.

---

Ketersediaan

Tidak ada salinan data

Informasi Detail

Judul Seri

New Phytologist

No. Panggil

-

Penerbit

: New Phytologist Trust, www.newphytologist.com., 2014

Deskripsi Fisik

New Phytologist (2014) 201: 279–291

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

PERTANIAN.

Info Detail Spesifik

-

Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar