NDLI: Pleiotropy of pea RisfixC supernodulation mutation is symbiosis-independent

Content Provider	Springer Nature Link
Author	vák, Karel Lisá, Ludmila Škrdleta, Vladimír
Copyright Year	2010
Abstract	Mutations affecting the development of root symbiosis between legume plants (Fabaceae) and nodule bacteria (rhizobia) are often associated with pleiotropy. This might either primarily be caused by the mutation or develops as a physiological consequence of a changed nodule structure, number and activity. Three pleiotropic traits were revealed in the pea (Pisum sativum L.) mutant RisfixC which is of supernodulation/nitrate-tolerant symbiosis (Nts) type. They comprise shortened internodes, reduced shoot dry mass accumulation and increased nitrogen content in the root tissues when compared to the wild type. The changes were expressed in the same degree in asymbiotic and nodulated plants when the effect of symbiotic nitrogen on plant growth was abolished with a saturating nitrate level. Consequently, the pleiotropic traits are inherently associated with the mutation. In RisfixC, the pleiotropy coincided with the presumed absence of the systemic feedback factor regulating nodule number. However, no differences were detected in the comparison of nonnodulating mutant Risnod27 (sym8) with the wild type and of inoculated with noninoculated wild-type plants although these pairs also differ in the presence of the systemic factor. Therefore, the pathway leading from the RisfixC mutant product to pleiotropic changes appears to be independent of systemic nodule number regulation. Implications for the genetic improvement of growth and yield parameters of supernodulating breeding lines are discussed.
Starting Page	173
Ending Page	182
Page Count	10
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	342
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-12-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Legumes Pea Rhizobium Symbiosis Supernodulation Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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