Effects of Cross-pollination and Flower Removal on Fruit Set in Macadamia

Stephen J Trueman; C G N Turnbull

doi:10.1006/anbo.1994.1003

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Effects of Cross-pollination and Flower Removal on Fruit Set in Macadamia

Journal article

Peer reviewed

Effects of Cross-pollination and Flower Removal on Fruit Set in Macadamia

Stephen J Trueman and C G N Turnbull

Annals of Botany, Vol.73(1), pp.23-32

1994

DOI: https://doi.org/10.1006/anbo.1994.1003

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Abstract

Plant Biology

Macadamia integrifolia

Macadamia tetraphylla

pollination

fruit set

Macadamia racemes were cross-pollinated and had flowers removed to determine whether manipulation of initial fruit set would affect final fruit set or yield. Examination of flowers collected 7 d after pollination indicated that the cross-pollination treatment generally induced a small (13-19%) but significant increase in the number of pollen grains per stigma. All flowers possessed some pollen grains, but in all cases cross-pollination approximately doubled the percentage of flowers with a pollen tube at the base of the style (42-68% of flowers on cross-pollinated racemes compared with 21-35% of flowers on control racemes). Fruit set after 14 d was always improved by cross-pollination, and this translated into increased final fruit numbers on two out of four occasions. In these two cases, kernel weights were increased by 24 and 31% in the cross-pollinated treatments. This indicates a possible xenic (paternal parent) effect in macadamia. Flower removal resulted in retention of a greater percentage of flowers as fruits, so that only severe reductions in flower number decreased final fruit numbers. Improved efficiency of cross-pollination in macadamia may increase both nut numbers and nut size.

Details

Title: Effects of Cross-pollination and Flower Removal on Fruit Set in Macadamia
Authors: Stephen J Trueman (Author) - University of Queensland
C G N Turnbull (Author) - CSIRO Division of Horticulture
Publication details: Annals of Botany, Vol.73(1), pp.23-32
Publisher: Oxford University Press
Date published: 1994
DOI: 10.1006/anbo.1994.1003
ISSN: 0305-7364
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; GeneCology Research Centre - Legacy
Language: English
Record Identifier: 99448642502621
Output Type: Journal article

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