NDLI: Impact of root exudates of different cultivars and plant development stages of rice (Oryza sativa L.) on methane production in a paddy soil

Content Provider	Springer Nature Link
Author	Aulakh, Milkha S. Wassmann, Reiner Bue, C. Rennenberg, Heinz
Copyright Year	2001
Abstract	The impact of root exudates, collected from five rice cultivars, on methane (CH$_{4}$) production was studied in a paddy soil under anaerobic conditions. Root exudates of the cultivars Dular, IR72 and IR65598 collected at four growth stages and of B40 and IR65600 collected at two growth stages showed that (a) CH$_{4}$ production was commenced rapidly within 2 h upon exudate addition and reached a maximum within a day of addition, and (b) 7-d incubation periods were sufficient to study exudate-induced CH$_{4}$ production potentials. Among different cultivars, high C releases from roots, increased the methanogenic source strength of the soil, which finally controlled CH$_{4}$ production. The relationship of the amount of CH$_{4}$ produced was stronger for the amount of total organic C (r = 0.920) than for the amount of organic acids (r = 0.868) added through exudates. Apparently, CH$_{4}$ production and CH$_{4}$ emission are more closely related to the release pattern of root exudate-C than to its individual components. The proportion of exudate-C converted to CH$_{4}$ ranged between 61 and 83% and remained unaffected by cultivars and growth stages suggesting that the majority of exudate-C served as a methanogenic substrate in the anoxic rice soils. These observations indicate that the use of high-yielding cultivars with lowest excretion (for example IR65598, IR65600) would result in lowest exudate-induced CH$_{4}$ production. Therefore, cultivar choice could greatly influence regional and global CH$_{4}$ emissions and screening/selection of exiting rice cultivars, and/or breeding new cultivars with low exudation rates could offer an important methane mitigation option as long as yields are not compromised.
Starting Page	77
Ending Page	86
Page Count	10
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	230
Issue Number	1
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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