Journal of Food, Agriculture and Environment

Methane emission and its relations with plant parameters and dissolved oxygen in different rice genotypes

Author(s):

H. M. El Sharkawi ^1*, A. Sherif ¹, A. Zahoor ², Faridullah ², S. Yamamoto ², T. Endo ²

Recieved Date: 2009-01-28, Accepted Date: 2009-03-30

Abstract:

The effect of growth parameters, aerenchyma gas spaces and dissolved oxygen (DO) in rice genotypes on CH₄ emission was examined to develop crop management strategies with low emitting rice lines while sustaining high yield. A total of 35 lines were studied in two sets of two experiments in completely randomized design. The mean CH₄ emission was highest in rice line IR 73688-82-2-3-2-2, and the lowest with line 96010-TR 1749-1-2-1-1. For the other rice genotypes an intermediate CH₄ emission at the average of 0.41 mg plant^-1 day^-1 was observed. There were significant differences in yield and growth parameters between the genotypes tested. This finding shows that the use of selected lines, such as IR 72 and Sakha 101 for rice breeding program, can potentially lower CH₄ emission (0.33 and 0.48 mg plant^-1 day^-1) without scarifying yield. Correlation analysis showed that CH₄ flux was significantly related with root weight, shoot dry weight, number of plant tillers and leaf area. Statistical analyses showed also that the negative correlation was significant (p < 0.001) between the methane emission and dissolved oxygen content of rhizosphere. However, CH₄ emission had significantly positive correlation (p < 0.01) with the number of aerenchyma gas spaces. The wide variation of the above traits and related emission rates among genotypes opens the possibility for breeding rice cultivars with low methane emission potential.

Keywords:

CH₄ emission, rice genotypes, growth parameters, aerenchyma gas spaces

---

Journal: Journal of Food, Agriculture and Environment
Year: 2009
Volume: 7
Issue: 2
Category: Agriculture
Pages: 463-470

---

Full text for Subscribers

---

Information:

Note to users

The requested document is freely available only to subscribers/registered users with an online subscription to the Journal of Food, Agriculture & Environment. If you have set up a personal subscription to this title please enter your user name and password. All abstracts are available for free.

Article purchasing

If you like to purchase this specific document such as article, review or this journal issue, contact us. Specify the title of the article or review, issue, number, volume and date of the publication. Software and compilation, Science & Technology, all rights reserved. Your use of this website details or service is governed by terms of use. Authors are invited to check from time to time news or information.

---

Purchase this Article:   20 Purchase PDF Order Reprints for 15

---

Share this article :