Pollen formation and fruit set in some cultivars of Heliconia psittacorum

Lee, Y.H.; Ng, Nigel Yuan Yun; Goh, C. J.

doi:10.1016/0304-4238(94)90072-8

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…The absence of fruiting after manual in vivo pollination treatments in natural H. psittacorum populations was similar to that reported by Lee et al (1994) after spontaneous self-pollination and cross-pollination in six H. psittacorum cultivars and by Missagia and Verçoza (2011) after spontaneous self-pollination of H. spathocircinata.…”

Section: Discussionsupporting

confidence: 85%

Secondary pollen presentation and foral traits of Heliconia psittacorum

Nascimento

Silva

Loges

et al. 2018

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The secondary presentation of pollen consists of a foral mechanism where the presentation of pollen occurs in other foral structures in addition to the anther, in order to increase the precision of the dispersion of the pollen by the vectors. This study aims to describe the temporal dynamics of secondary pollen presentation, and morphological and morphometric characteristics in stages of pre- anthesis and anthesis in genotypes of fve natural Heliconia psittacorum populations. For the study of foral morphometry traits of length of the fower, stamen, stigma and height of flament insertion in the petal in bud and fower were measured. The foral morphology of pre-anthesis buds and fowers in anthesis, the presence or absence of characteristics such as herkogamy, region of flament insertion in the petal, region of stylar hairs, and of secondary pollen deposition were evaluated. Treatments of controlled pollinations, self-pollination, geitonogamy, cross-pollination, natural pollination and growth to pollen tube were sampled. Floral herkogamy and pollen transfer to the adhered hairs in the stylar region were clearly observed during anthesis, constituting the frst record of occurrence of secondary pollen presentation in Heliconiaceae. Pollen tube growth was inhibited in the stigmatic, style and basal regions of the pistil. Natural fruiting produced little or no fruit. The positioning of the stamens above the stigma, pollen viability and stigma receptivity during anthesis of H. psittacorum fowers may favor self-pollination. The stylar hairs observed in all H. psittacorum populations’ help in the retention of pollen grains. The low fruiting rate in controlled and natural pollinations suggest that the main propagation form of H. psittacorum in the study areas is based on asexual reproduction.

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Section: Discussionsupporting

confidence: 85%

Secondary pollen presentation and foral traits of Heliconia psittacorum

Nascimento

Silva

Loges

et al. 2018

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“…We observed these two species occurring together with H. rivularis, which reinforces the suggestion by Andersson (1992). The presence of anthers with rare pollen grains, of variable size and no content, gives more evidence that H. rivularis is a hybrid, since studies on natural hybrids (Kress and Stone, 1983) and cultivars of Heliconia (Lee et al, 1994;Prakash et al, 2000) brought similar results.…”

Section: Article In Pressmentioning

confidence: 55%

Anther development, microsporogenesis and microgametogenesis in Heliconia (Heliconiaceae, Zingiberales)

Simão

Scatena

Bouman

2007

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…The rarity of triploids is due to the triploid block, which results in massive abortion of triploid seeds because of the failure of the endosperm to develop normally (Bretagnolle and Thompson 1995) and also in part due to their innate sterility (Burnham 1962;Schultz-Schaeffer 1980;Singh et al 1992;Lee et al 1994). Therefore, the production of a triploid plant is a rare event and its inability to reproduce sexually decreases its chance of persisting in nature.…”

Section: Neiõs Distancementioning

confidence: 99%

Genetic Evidence that Lomatia tasmanica (Proteaceae) is an Ancient Clone

Lynch¹,

Barnes²,

Cambecèdes³

et al. 1998

Aust. J. Bot.

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Lomatia tasmanica W.M.Curtis is an endangered species with only one population. The population occurs over a distance of 1.2 km and consists of several hundred stems. Although it flowers occasionally, fruit production has never been observed, and it propagates vegetatively. The genetic diversity in L. tasmanica, and its relationship with the other species of this genus in Tasmania was investigated using allozyme analysis and chromosome counts. Sixteen isozyme loci were scored on 78 L. tasmanica plants collected from throughout the range of the species. No genetic diversity was found in L. tasmanica. Lomatia tinctoria possessed 22 (2n = 22) chromosomes, like other Lomatia species previously counted, while L. tasmanica had 33 to 29 chromosomes, which makes it an unstable triploid. The triploid nature of L. tasmanica would explain its lack of genetic diversity and its apparent sterility. This suggests that the entire species may be one genet, one of the largest plant clone ever found. Fossilised leaves identified as L. tasmanica by Jordan et al. (1991) and dated as at least 43 600 years old may indicate the minimum age of this genet. This clone maybe one the worldÕs oldest known living plant individual. IntroductionLomatia tasmanica W.M.Curtis is an endangered shrub species, restricted in distribution to south-western Tasmania. It was first collected by D. King in May 1934. However, this population appears to have since become extinct. A flowering specimen from a second population was later collected by D. King in 1965. This specimen was sent to J. H. Willis for identification and the plant was described by W. M. Curtis in 1967. Only one population is currently known. The species is found along creek gullies in rainforest in south-western Tasmania.Interestingly, the species has never been observed to form mature fruit and seeds. It has been observed to flower but not annually. Regeneration appears to be vegetative by rhizome (Brown and Gray 1985). W. M. Curtis suggested that the species may be of hybrid origin (A. M. Gray, pers. comm., to Brown and Gray 1985). Brown and Gray (1985) further speculated that L. polymorpha may be a parent, since it grows in the vicinity. Lomatia tinctoria was considered a less likely parent because it does not presently grow in the vicinity of L. tasmanica. The objectives of this study were firstly to estimate the level of genetic diversity within L. tasmanica using allozyme analysis and, secondly, to determine the genetic distinctiveness of L. tasmanica from the other Tasmanian Lomatia species, L. tinctoria and L. polymorpha, using allozyme analysis and chromosome counts.

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Pollen formation and fruit set in some cultivars of Heliconia psittacorum

Cited by 9 publications

References 4 publications

Secondary pollen presentation and foral traits of Heliconia psittacorum

Secondary pollen presentation and foral traits of Heliconia psittacorum

Anther development, microsporogenesis and microgametogenesis in Heliconia (Heliconiaceae, Zingiberales)

Genetic Evidence that Lomatia tasmanica (Proteaceae) is an Ancient Clone

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