Research note: Shoot control of hypernodulation and aberrant root formation in the har1-1 mutant of Lotus japonicus

Functional Plant Biology : FPB
Qunyi Jiang, Peter M Gresshoff

Abstract

The har1-1 mutant of Lotus japonicus B-129-S9 Gifu is characterized by two phenotypes: greater than normal nodulation (hypernodulation) and significantly inhibited root growth in the presence of its microsymbiont Mesorhizobium loti strain NZP2235. We demonstrate that the two traits co-segregate, suggesting a single genetic alteration involving developmental pleiotropy. A cross between the mutant and genotype Funakura (with wild-type root and nodule morphology) demonstrated Mendelian recessive segregation of both phenotypes (root and nodule) in 216 F2 individuals. Using DNA-amplification fingerprinting polymorphisms in Gifu har1-1 and Funakura, the mutant locus was positioned between two markers at about 7 and 13 cM distance. Reciprocal hypocotyl grafting of shoots and roots showed that the hypernodulation and reduced root phenotypes are both predominantly controlled by the shoot.

Citations

Sep 13, 2008·Molecular Plant-microbe Interactions : MPMI·Mark Kinkema, Peter M Gresshoff
Feb 26, 2011·Biotechnology Research International·Premananda Das
Aug 9, 2011·Plant, Cell & Environment·Virginie MortierSofie Goormachtig
Jan 5, 2011·Molecular Plant-microbe Interactions : MPMI·Dugald E ReidPeter M Gresshoff
Oct 23, 2009·Plant Signaling & Behavior·Peter M GresshoffGary Stacey

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