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Self-incompatibility in Eucalyptus

Citation

Potts, BM and Savva, M, Self-incompatibility in Eucalyptus, Proceedings of the Pollination '88 Symposium, 26-27 August 1998, University of Melbourne, pp. 165-170. (1988) [Refereed Conference Paper]


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Copyright 1988 the Authors - The University is continuing to endeavour to trace the copyright owners and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owners.

Abstract

Eucalypts are generally preferentially outcrossing (Pryor 1976; Griffin et al 1987), with relatively high outcrossing rates (e.g. 0.69-0.84 Moran and Bell 1983) maintained by varying degrees of self-fertility (Pryor 1957, 1976; Hodgson 1976b; Griffin et al 1987), aided by protandry (Pryor 1976) and reinforced by selection against the products of self-fertilization in later stages of the life cycle (see Potts et al 1987). Most species exhibit a marked reduction in seed yield following self-pollination compared to outcrossing, although within species there is considerable variation in the level of self-fertility (Pryor 1957, 1976; Table 1). In most of the species examined in detail to date, the majority of individuals are partially self-fertile, but individuals range from fully self-incompatible to fully self-fertile (Table 1). Postmating barriers to self-fertilization are thus rarely complete, and Eldridge (1976) notes of the genus that "persistent attempts at artificial self-pollination have been successful to some degree on almost every tree tested". Griffin et al (1987) later noted that with only one possible exception, all the E. regnans trees they had investigated were self-fertile to some degree, and Pryor (1957) states that of some dozens of individuals examined of nine species only one tree of E. bicostata was found to be fully self-incompatible. Early reports of self-sterile species (Krung and Alves 1949) have not been substantiated (e.g. E. grandis - Hodgson 1976a,b), although Eldridge (1976) did note the failure of self-pollination of E. deglupta while outcrossing was successful.

Considerable variability in the success of replicate self-pollinations has been reported (Tibbits 1988), and clearly adequate controls and several independent replications of a cross are required before a plant can be reliably classified as fully self-incompatible.

Item Details

Item Type:Refereed Conference Paper
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Developmental and Reproductive Biology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Forest and Woodlands Flora, Fauna and Biodiversity
Author:Potts, BM (Professor Brad Potts)
Author:Savva, M (Mr Nicholas Savva)
ID Code:87076
Year Published:1988
Deposited By:Plant Science
Deposited On:2013-11-06
Last Modified:2014-10-02
Downloads:1 View Download Statistics

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