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The relationship of the female reproductive success of Eucalyptus globulus to the endogenous properties of the flower

Citation

Suitor, S and Potts, BM and Brown, PH and Gracie, AJ and Gore, PL, The relationship of the female reproductive success of Eucalyptus globulus to the endogenous properties of the flower, Sexual Plant Reproduction, 22, (1) pp. 37-44. ISSN 0934-0882 (2009) [Refereed Article]

DOI: doi:10.1007/s00497-008-0089-5

Abstract

Low capsule and seed set is a major factor limiting seed production in Eucalyptus globulus seed orchards. Controlled pollination studies showed that the reproductive success (number of seeds produced per flower pollinated) was primarily determined by the female. We aimed to identify the factors contributing to the differences in reproductive success between female genotypes in terms of the physical and anatomical properties of the flower. We studied pairs of genotypes of high and low reproductive success from each of three races (Furneaux Group, Strzelecki Ranges and Western Otways) growing in a seed orchard. Controlled pollinations were performed on six females and along with flower physical measurements, pollen tube growth and seed set were assessed. Overall tree reproductive success was positively correlated with flower size, ovule numbers, style size, cross-sectional area of conductive tissue within the style (all of which were inter-correlated) and the proportion of pollen tubes reaching the bottom of the style. Significant positive correlations of reproductive success and flower physical properties between different ramets of the same genotypes across seasons suggests a genetic basis to the variation observed. The majority of pollen tube attrition occurred within the first millimetre of the cut style and appeared to be associated with differences in style physiology. When examined as pairs within races the difference in reproductive success for the Western Otways pair was simply explained by differences in flower size and the number of ovules per flower. Physical features did not differ significantly for the Strzelecki Ranges pair, but the proportion of pollen tubes reaching the bottom of the style was lower in the less reproductively successful genotype, suggesting an endogenous physiological constraint to pollen tube growth. The difference in reproductive success between the females from the Furneaux Group was associated with a combination of these factors. © 2008 Springer-Verlag.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Developmental and Reproductive Biology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood Plantations
UTAS Author:Suitor, S (Mr Shaun Suitor)
UTAS Author:Potts, BM (Professor Brad Potts)
UTAS Author:Brown, PH (Professor Phil Brown)
UTAS Author:Gracie, AJ (Associate Professor Alistair Gracie)
ID Code:53534
Year Published:2009
Web of Science® Times Cited:1
Deposited By:Agricultural Science
Deposited On:2008-12-10
Last Modified:2012-03-05
Downloads:0

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