Affiliation:
1. Plant Molecular Genetics Laboratory (D.W.R.W.),
2. and Plant Improvement Group (D.R.W., J.R.C.), Grasslands Division, AgResearch, Private Bag 11008, Palmerston North, New Zealand
Abstract
Abstract
A monogenic dominant mutant of white clover (Trifolium repens L.), designatedMortal, which is defective in the formation of adventitious nodal roots, is described. Mortal plants grown at temperatures ranging from 10 to 25°C do not initiate nodal root primordium development. However, all other aspects of plant development are normal, including the formation of lateral roots and wound-induced adventitious roots. In some genetic backgrounds, theMortal mutation has a temperature-sensitive conditional phenotype. Mortal plants shifted from growing conditions of 20 to 30°C for 2 to 3 d form nodal root meristems. However, new nodes that develop after plants are returned to 20°C exhibit the mutant phenotype. The capacity to form nodal roots on cuttings placed in water is also influenced by the genetic background of theMortal mutation. Genetic analysis established that the physiological reversion of Mortal to nodal root formation is controlled by at least two separate dominant genetic loci, one for Nodal water response (Now) and one for Nodaltemperature response (Not); theNow locus has a dominant epistatic interaction with theNot locus. The conditional nature ofMortal should provide opportunities for the identification of genetic and physiological mechanisms that influence the development of nodal roots.
Publisher
Oxford University Press (OUP)
Subject
Plant Science,Genetics,Physiology
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