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Pollen-pistil interactions between autotetraploid and diploid Acacia mangium and diploid A. auriculiformis
journal contribution
posted on 2023-05-17, 16:03 authored by Nghiem, QC, Jane HarbardJane Harbard, Harwood, CE, Anthony Griffin, Ha, TH, Anthony KoutoulisAnthony KoutoulisDevelopment of sterile triploid (3x) planting stock could help manage the risk of invasivity of widely planted Acacia species. Triploids may be derived from crosses of diploid and tetraploid plants. This study investigated the effect of cytotype on pollen-pistil interaction following mating between colchicine-induced tetraploid A. mangium (AM-4x), diploid A. mangium (AM-2x) and A. auriculiformis (AA-2x). Following controlled pollinations, pollen tubes grew well in the style, entered the ovary and penetrated ovules within 72 hours, regardless of the mating type. However, mean number of penetrated ovules per ovary was lower for AM-4x than for AM-2x or AA-2x maternal parents for all cross combinations except for self-pollination. Considering crosses between cytotypes, interspecies had signifcantly greater number of ovules penetrated than intraspecies. However, yields of pods (1.03%) and filled seeds (5.3%) following all inter-cytotype crosses were extremely poor compared with intra-cytotype (7.59 and 76.3% respectively). Thus, there were strong barriers to production of viable 3x seeds, despite the demonstrated absence of pre-zygotic isolation.
Funding
Australian Centre for International Agricultural Research
History
Publication title
Journal of Tropical Forest ScienceVolume
25Pagination
96-110ISSN
0128-1283Department/School
School of Natural SciencesPublisher
Forest Research Institute MalaysiaPlace of publication
Publication Unit, Kepong, Kuala Lumpur, Malaysia, 52109Rights statement
Copyright 2013 Forest Research Institute MalaysiaRepository Status
- Restricted