scholarly journals Cytogenetics and Reproductive Biology of some BELE (Abelmoschus manihot Linn., Medic Sub-Species manihot) Cultivars

2002 ◽  
Vol 20 (1) ◽  
pp. 4 ◽  
Author(s):  
Anand P. Tyagi
Keyword(s):  
Papua New Guinea ◽  
Reproductive Biology ◽  
Genetic Difference ◽  
Pollen Viability ◽  
Pollen Grains ◽  
New Guinea ◽  
Staining Technique ◽  
Root Tips ◽  
Fiji Islands ◽  
Cross Compatibility

Four locally grown (from Fiji Islands) and three imported (from Papua New Guinea), a total of seven BELE (Abelmoschus manihot Linn., Medic sub-species manihot) cultivars were investigated for their cytogenetics and reproductive biology. Chromosome counting from flower buds and root tips showed that chromosome number in all the seven cultivars does not exceed 2n=66. Pollen viability in all the seven cultivars was high, exceeding 85% from pollen staining technique and 78% from pollen germination technique. All the seven Bele cultivars were fully self-compatible. Cross-compatibility among four local cultivars and three cultivars from Papua New Guinea was very high. However cross compatibility between local (Fijian) cultivars and cultivars from Papua New Guinea was partial indicating some degree of genetic difference between cultivars from two countries. This could be due to differences in compatibility alleles between cultivars from Fiji and Papua New Guinea. Procedures such as cutting the style shorter and placing pollen grains to enhance and affect fertilisation to get cross seed were suggested.

scholarly journals Reproductive biology and pollination of Cabomba aquatica (Cabombaceae)

Rodriguésia ◽  
2011 ◽  
Vol 62 (4) ◽  
pp. 919-926 ◽  
Author(s):  
Jacilene Bezerra da Silva ◽  
Ana Virgínia de Lima Leite
Keyword(s):  
Reproductive Biology ◽  
High Frequency ◽  
Pollen Viability ◽  
Pollen Grains ◽  
Pollen Flow ◽  
Northeastern Brazil ◽  
Nectar Production ◽  
High Pollen ◽  
Pollinator Behavior ◽  
Effective Pollinators

Abstract Reproductive biology and pollination of the fanwort, Cabomba aquatica Aubl., were studied in populations from dams located in Dois Irmãos State Park, Recife, Pernambuco state, northeastern Brazil. Flower anthesis in this species is diurnal and lasts two days. The flowers are bisexual and exhibit herkogamy and incomplete protogyny. Each flower produces an average of 2.1 ± 94.8 pollen grains, with a P/O ratio of 1.055 and high pollen viability (99.7%). This species is self-compatible, but requires biotic vectors to transfer pollen. We observed visits of bees (Apidae and Halictidae), wasps (Vespidae) and flies (Diptera) to the flowers. Bees and wasps were considered to be effective pollinators, both due to their behavior and their high frequency of visits to flowers, whereas flies were considered to be occasional pollinators. The floral mechanism (herkogamy and protogyny), together with low nectar production and pollinator behavior during visits, may contribute to increase pollen flow between individuals.

scholarly journals On the reproductive biology of Salacia fruticosa Wall. ex M.A. Lawson - an endemic medicinal plant of the Western Ghats, india

2018 ◽  
Vol 10 (15) ◽  
pp. 13002-13005
Author(s):  
K. Subin ◽  
P. A. Jose ◽  
T. V. Sarath
Keyword(s):  
Reproductive Biology ◽  
Fruit Set ◽  
Pollen Viability ◽  
Pollen Grains ◽  
Seedling Bank ◽  
The Poor ◽  
Short Period ◽  
Poor Seed ◽  
Endemic Medicinal Plant ◽  
The Western Ghats

Salacia fruticosa Wall. ex M.A. Lawson, an endemic species was studied for the reproductive biology as this species showed reduced fruit set and natural regeneration.  The stigma-anther proximity, an extremely low number of pollen grains, a short period of pollen viability, a sparse incidence of pollinators, protandrous and facultative autogamous nature of the flowers and a low percent in fruit set were identified as biological constraints for the species.  The incidence of seed pest was added to the poor seed and seedling bank and accelerated rarity process of the species.

Notes on Early Land Plants Today. 59. Leptolejeunea himalayensis and Leptocolea mirpurensis (Marchantiophyta, Lejeuneaceae) synonymous with Lejeunea cocoes and Cololejeunea raduliloba, respectively 

Phytotaxa ◽  
2014 ◽  
Vol 173 (1) ◽  
pp. 95 ◽  
Author(s):  
Lei SHU ◽  
Rui-Liang Zhu
Keyword(s):  
Sri Lanka ◽  
Papua New Guinea ◽  
New Guinea ◽  
Original Description ◽  
Land Plants ◽  
Fiji Islands ◽  
Diego Garcia ◽  
Early Land

Lejeuneaceae is the largest family of the liverworts with about 1700 currently accepted species (He & Zhu 2011, He et al. 2012), but some of them are poorly known and their status is still unclear. Leptolejeunea himalayensis Pandé & Misra (1943: 168) is known only from India and previously suspected of belonging to one member of Lejeunea Libert (1820: 372) (Awasthi 1986). Leptocolea mirpurensis Khan (1957: 23) from Bangladesh has never been studied since its first description in 1957. Although the types of the two taxa were not available for our study, the original description and illustrations (Pandé & Misra 1943, Khan 1957) undoubtedly indicate that Leptolejeunea himalayensis and Leptocolea mirpurensis are conspecific with Lejeunea cocoes Mitten (1861: 114) and Cololejeunea raduliloba Stephani (1895: 251), respectively. Lejeunea cocoes has been reported for India (Singh & Nath 2007, Manju et al. 2012), and is also known in China, Indonesia, Malaysia, Papua New Guinea, and Sri Lanka (So & Zhu 1998, Zhu & So 2001, Lee 2013), furthermore from Chagos, Diego Garcia (Seaward et al. 2006) and from the Fiji Islands (Pócs et al. 2013). Cololejeunea raduliloba, a paleotropical species (Zhu & So 2001), is newly reported for Bangladesh.

Cytogenetics and reproductive biology of mangroves in Rhizophoraceae

2002 ◽  
Vol 50 (5) ◽  
pp. 601 ◽  
Author(s):  
Anand Prakash Tyagi
Keyword(s):  
Reproductive Biology ◽  
Parental Species ◽  
Pollen Viability ◽  
Putative Hybrid ◽  
Bruguiera Gymnorrhiza ◽  
Mangrove Species ◽  
Rhizophora Stylosa ◽  
Cross Compatibility ◽  
Allelic Differences ◽  
Partial Homology

Three mangrove species, Bruguiera gymnorrhiza (L.) Lam., Rhizophora samoensis (Hochr.) Salvoza, Rhizophora stylosa Griff. and a putative hybrid Rhizophora ×selala (Salvoza) between the latter two species were studied for their cytogenetics and reproductive biology. Although chromosome numbers in all four taxa were confirmed as 2n = 36, the size of the chromosomes was slightly larger in genus Bruguiera. Regular chromosome pairing was observed in the three species; however, in the hybrid meiosis was very irregular. Pollen viability in all three species was very high (>80%); however, in the hybrid pollen viability was <10%. This could be due to non-homology in the chromosomes of the two parental species and irregular meiosis in the hybrid. Due to highly irregular meiosis in the hybrid and uneven distribution of chromosomes to the two poles, most of the pollen was non-viable. All three species were fully self-compatible. Between B. gymnorrhiza and the two Rhizophora species, pollen in crosses and reciprocal crosses failed to germinate, indicating cross-incompatibility between these two genera. Partial cross-compatibility was recorded between R. samoensis and R. stylosa. In many crosses, pollen tubes were observed growing freely up to the base of the style. This also accords with occasional crossing of these species in nature. However, due to only partial homology in the chromosomes of these two species, the hybrids produced are always sterile. Similarly, cross-compatibility between the hybrid and its two parental species was also partial. This could be attributed to allelic differences between the two species and their hybrid and also to physiological and/or chemical hindrance of the pollen-tube growth through the stylar tissue.

The coral bugs, genus Halovelia Bergroth (Hemiptera, Veliidae). I. History, classification, and taxonomy of species except the H. malaya-group

1989 ◽  
Vol 20 (1) ◽  
pp. 75-120 ◽  
Author(s):  
N. Møller Andersen
Keyword(s):  
Papua New Guinea ◽  
Red Sea ◽  
Type Species ◽  
Solomon Islands ◽  
Historical Review ◽  
New Guinea ◽  
Northern Territory ◽  
Western Pacific Ocean ◽  
Fiji Islands ◽  
Caroline Islands

AbstractMarine bugs of the genus Halovelia Bergroth inhabit intertidal coral reefs and rocky coasts along the continents and larger islands bordering the Red Sea, Indian Ocean, and western Pacific Ocean as well as on island groups and atolls in these areas. A historical review of the study of the genus is presented and different views upon its classification discussed. The genus Halovelia is redescribed together with its type species, H. maritima Bergroth, and four other previously known species. Fifteen new species are described: H. carolinensis sp.n. (Caroline Islands), H. halophila sp.n. (Sumbawa, Sabah), H. corallia sp.n. (Papua New Guinea, Australia: Queensland), H. esakii sp.n. (Solomon Islands, Irian New Guinea, Moluccas, Sulawesi, Sumbawa, Palau Islands, Philippines), H. polhemi sp.n. (Australia: Northern Territory), H. solomon sp.n. (Solomon Islands), H. novoguinensis sp.n. (Papua New Guinea), H. fosteri sp.n. (Fiji Islands), H. tongaensis sp.n. (Tonga Islands), H. heron sp.n. (Australia: S. Queensland), H. fijiensis sp.n. (Fiji Islands), H. inflexa sp.n. (Sudan, Red Sea), H. annemariae sp.n. (Solomon Islands, Papua New Guinea), H. lannae sp.n. (Java, Singapore, West Malaysia, Sabah, Philippines), and H. wallacei sp.n. (Sulawesi, Sumbawa). Two names are synonymized: H. marianarum Usinger syn.n. (= H. bergrothi Esaki) and H. danae Herring syn.n. (= H. bergrothi Esaki). The following species are removed from the genus Halovelia: H. papuensis Esaki, H. loyaltiensis China, and H. (Colpovelia) angulana Polhemus. A key to the species is included. The taxonomy of the H. malaya-group will be presented in Part II of this work together with the cladistics, ecology, biology, and biogeography of the genus.

Reproductive biology and genetic marker diversity in Grevillea infecunda (Proteaceae), a rare plant with no known seed production

2002 ◽  
Vol 15 (4) ◽  
pp. 485 ◽  
Author(s):  
Sarah K. Kimpton ◽  
Elizabeth A. James ◽  
Andrew N. Drinnan
Keyword(s):  
Reproductive Biology ◽  
Fragment Length Polymorphism ◽  
Pollen Viability ◽  
Genotypic Variation ◽  
Pollen Grains ◽  
Genotypic Diversity ◽  
Narrow Endemic ◽  
Root Suckering ◽  
Sufficient Variation ◽  
Two Populations

Grevillea infecunda D.J.McGillivray is a narrow endemic that reproduces vegetatively via root suckering. The reproductive biology of five Grevillea infecunda populations was investigated by scanning electron microscopy and light microscopy. Stigma maturation follows normal Grevillea development. However, a large number of pollen grains with aberrant forms were documented. A fluorochromatic reaction (FCR) test revealed 0.04% pollen viability. All pollen samples collected from two populations were completely sterile. All viable grains were &gt;100 �m in diameter and included aberrant forms. Amplified fragment length polymorphism (AFLP) technique was used to investigate genotypic diversity in G. infecunda. Three primer pairs revealed sufficient variation in 109 loci to assign a unique phenotype to every individual (N = 40) sampled. This suggests that the populations were established from founder seedlings. The species has apparently lost the ability to reproduce sexually but genotypic variation is maintained through asexual reproduction via root suckers.

In vitro pollen germination and viability of a Java × New Guinea Impatiens interspecific hybrid

1987 ◽  
Vol 65 (9) ◽  
pp. 1967-1968 ◽  
Author(s):  
C. B. Hicks ◽  
L. C. Stephens ◽  
J. L. Weigle
Keyword(s):  
Interspecific Hybrid ◽  
Pollen Germination ◽  
Agar Medium ◽  
Pollen Viability ◽  
Pollen Grains ◽  
New Guinea ◽  
Chi Square ◽  
Pollen Diameter ◽  
New Guinea Impatiens

Pollen germination on 2% agar medium was investigated as a method of screening pollen viability, using ISU 7851-1, a Java × New Guinea Impatiens interspecific hybrid. A chi-square test showed that percentage pollen germination was related to corresponding seed set. However, some pollinations yielded seeds from pollen that tested in vitro as low as 0.5% germination. Other Impatiens genotypes were screened rapidly for pollen viability by microscopically scanning for pollen germination in vitro. ISU 7851-1 pollen diameter sizes ranged from 18 to 81 μm on agar medium, but only pollen grains of 45 μm and larger were capable of in vitro germination.

Public Health in Papua New Guinea

1989 ◽  
Author(s):  
Donald Denoon ◽  
Kathleen Dugan ◽  
Leslie Marshall
Keyword(s):  
Public Health ◽  
Papua New Guinea ◽  
New Guinea
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