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- Title
The MADS-box geneDAL1is a potential mediator of the juvenile-to-adult transition in Norway spruce (Picea abies).
- Authors
Carlsbecker, Annelie; Tandre, Karolina; Johanson, Urban; Englund, Marie; Engström, Peter
- Abstract
Progression through the plant life cycle involves change in many essential features, most notably in the capacity to reproduce. The transition from a juvenile vegetative and non-reproductive to an adult reproductive phase is gradual and can take many years; in the conifer Norway spruce,Picea abies, typically 20–25 years. We present a detailed analysis of the activities of three regulatory genes with potential roles in this transition in Norway spruce:DAL1, a MADS-box gene related to theAGL6group of genes from angiosperms, and the twoLEAFY-related genesPaLFYandPaNLY.DAL1activity is initiated in the shoots of juvenile trees at an age of 3–5 years, and then increases with age, whereas bothLFYgenes are active throughout the juvenile phase. The activity ofDAL1further shows a spatial pattern along the stem of the tree that parallels a similar gradient in physiological and morphological features associated with maturation to the adult phase. Constitutive expression ofDAL1in transgenicArabidopsisplants caused a dramatic attenuation of both juvenile and adult growth phases; flowers forming immediately after the embryonic phase of development in severely affected plants. Taken together, our results support the notion thatDAL1may have a regulatory role in the juvenile-to-adult transition in Norway spruce.
- Subjects
PLANT life cycles; NORWAY spruce; PLANT genetics; GENE expression in plants; ARABIDOPSIS; TRANSGENIC plants
- Publication
Plant Journal, 2004, Vol 40, Issue 4, p546
- ISSN
0960-7412
- Publication type
Article
- DOI
10.1111/j.1365-313X.2004.02226.x