Floral Structure, Stigma Receptivity and Pollen Viability in Relation to Protandry and Self-incompatibility in Silky Oak (Grevillia robusta A. Cunn)
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Kalinganire, A; Harwood, C; Slee, Mike; Simons, A
Description
The reproductive biology of Grevillea robusta growing under exotic conditions in Kenya and Australia is reported. The species showed both protandry and a self-incompatibility mechanism. The stigma was wet and papillate with a distinct groove in the middle. The anthers dehisced prior to anthesis, when the perianth opened. Stigmatic receptivity began 1 d after anthesis, with the greatest pollen germination rates and longest pollen tubes obtained 2 d after anthesis. Nectar secretion commenced with...[Show more]
dc.contributor.author | Kalinganire, A | |
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dc.contributor.author | Harwood, C | |
dc.contributor.author | Slee, Mike | |
dc.contributor.author | Simons, A | |
dc.date.accessioned | 2015-12-13T23:18:41Z | |
dc.identifier.issn | 0305-7364 | |
dc.identifier.uri | http://hdl.handle.net/1885/90296 | |
dc.description.abstract | The reproductive biology of Grevillea robusta growing under exotic conditions in Kenya and Australia is reported. The species showed both protandry and a self-incompatibility mechanism. The stigma was wet and papillate with a distinct groove in the middle. The anthers dehisced prior to anthesis, when the perianth opened. Stigmatic receptivity began 1 d after anthesis, with the greatest pollen germination rates and longest pollen tubes obtained 2 d after anthesis. Nectar secretion commenced with pollen dehiscence and was abundant at anthesis. Most stigmatic grooves opened widely 1-2 d after anthesis and stigmas showed taller papillae and abundant secretion. Controlled pollinations gave a greater fruit set from cross-pollination (5.9 % in April and 17.5 % in July) than open-pollination (0.1 % in April and 3.3 % in July). No fruit set from self-pollination was obtained in April, and very few fruit set for geitonogamous (two out of 1622; 0.1%) or for autogamous (one out of 2707 flowers; 0.04 %) pollination treatments in July. Following self-pollination, growth of pollen tubes was poorer than in other treatments, and was generally arrested in the upper style. Cross-pollinated flowers produced normal and straight pollen tubes, while self-pollen tubes had growth abnormalities. Most of the open-pollinated flowers were found without pollen or with only self-pollen on their stigmas indicating that the amount of cross-pollen reaching the stigma under open-pollination may be a factor limiting seed production. Flowers shed soon after the fertilization phase were those with ungerminated pollen or no pollen. Although a very low rate of selfing may occur, G. robusta presents a self-incompatibility system and allogamy is its primary breeding behaviour. (C) 2000 Annals of Botany Company. | |
dc.publisher | Academic Press | |
dc.source | Annals of Botany | |
dc.subject | Keywords: Controlled pollinations; Grevillea robusta; Pollen-tube growth; Pollination; Protandry; Proteaceae; Receptivity; Self-incompatibility; Silky oak | |
dc.title | Floral Structure, Stigma Receptivity and Pollen Viability in Relation to Protandry and Self-incompatibility in Silky Oak (Grevillia robusta A. Cunn) | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.description.refereed | Yes | |
local.identifier.citationvolume | 86 | |
dc.date.issued | 2000 | |
local.identifier.absfor | 060310 - Plant Systematics and Taxonomy | |
local.identifier.ariespublication | MigratedxPub20620 | |
local.type.status | Published Version | |
local.contributor.affiliation | Kalinganire, A, College of Medicine, Biology and Environment, ANU | |
local.contributor.affiliation | Harwood, C, CSIRO Forestry and Forest Products | |
local.contributor.affiliation | Slee, Mike, College of Medicine, Biology and Environment, ANU | |
local.contributor.affiliation | Simons, A, International Centre for Research in Agroforestry | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.startpage | 133 | |
local.bibliographicCitation.lastpage | 148 | |
local.identifier.doi | 10.1006/anbo.2000.1170 | |
dc.date.updated | 2015-12-12T08:57:57Z | |
local.identifier.scopusID | 2-s2.0-0033812587 | |
Collections | ANU Research Publications |
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