Distribution and progression of stem bleeding disease of coconut  (Cocos nucifera L.) in some areas of the Philippines

Records of disease occurrence in surveyed provinces show Davao del Sur having the highest disease incidence of stem bleeding caused by Thielaviopsis paradoxa (de Seynes) von Hohnel. Disease incidence in Malayan Yellow Dwarf x West African Tall (MYD x WAT) hybrid at the PCA’s Zamboanga Research Center was relatively lower than the other areas observed. Tall genotypes are less susceptible to the disease as shown in the province of Quezon where the cultivar Laguna Tall is predominantly grown. The incidence of stem bleeding was found to be related with palms age. More incidence of the disease was noted in palms between 11-15 years old. Study on the spatial distribution of the disease from l991 to l995 show that the disease initially occurred in random foci, and, subsequently infected adjacent palms. The disease progress curves suggest that stem bleeding follows a sigmoid curve. It follows that the progress of the disease at any given time is a function of the initial inoculums and the number of effective contact points between susceptible host and inoculums per unit time. Analysis of the infection rates using logistic growth model showed that the rate of disease increase ranged from 0.029 to 0.218 per unit per year and 0.227 per unit per year in all the six experimental areas. Increase in disease incidence is directly related to high amount of rainfall.

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Comparative DNA Analysis of Coconut (Cocos nucifera L.) palms with polyembryonic and monoembryonic origins

Annals of Tropical Research ◽

10.32945/atr4222.2020 ◽

2020 ◽

pp. 21-29

Author(s):

Daisy Jane Toting ◽

Tessie Nuñez ◽

Dilberto Ferraren

Keyword(s):

Dna Analysis ◽

Cocos Nucifera ◽

Polyacrylamide Gel Electrophoresis ◽

The Philippines ◽

Pcr Products ◽

Planting Materials ◽

Cocos Nucifera L ◽

Dna Primers

Makapuno is a rare, high-value coconut in the Philippines known for its extraordinary thick gelatinous meat with various uses in the food industry. Homozygous makapuno embryos do not germinate in vivo so plantlets are produced in vitro. where one plantlet grows from an embryo. Rare cases of polyembryony were observed in makapuno hybrids developed bythe Visayas State University, Knowledge of the genetic control of polyembryony may be used to increase the production of planting materials of these rare coconut types. DNA analysis of two sets of twins (polyembryonic), three monoembryonic hybrid palms, and their monoembryonic parental cultivars Coconiño and tall makapuno was done using seven DNA primers to determine differences which may be associated with polyembryony in the hybrids. Polyacrylamide Gel Electrophoresis of PCR products showed DNA fragments amplified by primers CAC2 and CAC56 which are unique to the twins suggesting that polyembryony might have a genetic origin.

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Development of Self-pollinating and Early-bearing Philippine Makapuno (Cocos nucifera L.) Hybrids

Annals of Tropical Research ◽

10.32945/atr3424.2012 ◽

2012 ◽

pp. 63-74

Author(s):

Tessie Nuñez ◽

Edwin Ocoy

Keyword(s):

Lauric Acid ◽

Cocos Nucifera ◽

The Philippines ◽

The Self ◽

F1 Hybrids ◽

Seed Industry ◽

Self Pollination ◽

F2 Hybrids ◽

Cocos Nucifera L ◽

High Degree

The makapuno-bearing character found only in the cross-pollinated Laguna Tall coconut variety and the self-pollinating character of dwarf coconuts were combined into new makapuno genotypes through hybridization to limit cross pollination which is a problem among tall makapuno palms. F1 hybrids between Coconiño (CÑO) and tall Makapuno (TMAC) and Tacunan (TAC) x TMAC were early-bearing with high intraspadix overlapping percentages of 85.7% and 70.90, respectively. Mean makapuno yield was 26.8% in CÑO x TMAC and 28.2% in TAC x TMAC indicating the presence of high degree of self-pollination and the dominance of the gene for the trait. ln vitro grown homozygous F2 makapuno palms started flowering at 24 months old. F2 CÑO x TMAC (VMAC 1) had a mean yield of 100% makapuno, 49 to 132 nuts/palm/year and nuts weighing 332 to 750g/dehusked nut. F2 MRD x TMAC (VMAC 2) yielded a mean of 97% makapuno, 63 to 163 nuts/palm/year and nuts weighing 288 to 1,180g each. F2 TAC x TMAC (VMAC5) had 95% makapuno, nuts weighing 736g to 1,975g/ dehusked nut. High makapuno yield of the F2 hybrids affirmed the dominance of the gene for self-pollination in coconut. Ten month-old nuts of the F2s had at least 18 mm thick meat and Lauric acid (C12) content ranging from 47.10% to 48.60%. The three F2 hybrids were registered with the National Seed Industry Council (NSIC) in 2008 as the first homozygous makapuno hybrids in the Philippines.

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Growth of Dracaena marginata and Spathiphyllum ‘Petite’ in Sphagnum Peat- and Coconut Coir Dust-based Growing Media

Journal of Environmental Horticulture ◽

10.24266/0738-2898-17.1.49 ◽

1999 ◽

Vol 17 (1) ◽

pp. 49-52 ◽

Cited By ~ 4

Author(s):

Robert H. Stamps ◽

Michael R. Evans

Keyword(s):

Growth Parameters ◽

Cocos Nucifera ◽

Greenhouse Production ◽

Growing Media ◽

Sphagnum Peat ◽

Affected Plant ◽

Coir Dust ◽

Media Component ◽

The Media ◽

Cocos Nucifera L

Abstract A comparison was made of Canadian sphagnum peat (SP) and Philippine coconut (Cocos nucifera L.) coir dust (CD) as growing media components for greenhouse production of Dracaena marginata Bak. and Spathiphyllum Schott ‘Petite’. Three soilless foliage plant growing mixes (Cornell, Hybrid, University of Florida #2 [UF-2]) were prepared using either SP or CD and pine bark (PB), vermiculite (V), and/or perlite (P) in the following ratios (% by vol): Cornell = 50 CD or SP:25 V:25 P, Hybrid = 40 CD or SP:30 V:30 PB, UF-2 = 50 CD or SP: 50 PB. Dracaena root growth was not affected by treatments but there were significant mix × media component interactions that affected plant top growth parameters. In general, the growth and quality of D. marginata were reduced by using CD in Cornell, had no effect in Hybrid, and increased in UF-2. S. ‘Petite’ grew equally well in all growing mixes regardless of whether CD or SP was used; however, plants grew more in Cornell and Hybrid than in UF-2. S. ‘Petite’ roots, which were infested with Cylindrocladium spathiphylli, had higher grades when grown in CD than when the media contained SP.

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Etude anatomique des faisceaux pétiolaires de Cocos nucifera L.

Bulletin mensuel de la Société linnéenne de Lyon ◽

10.3406/linly.1959.8028 ◽

1959 ◽

Vol 28 (1) ◽

pp. 4-8

Author(s):

Christian Ginieis

Keyword(s):

Cocos Nucifera ◽

Cocos Nucifera L

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Diversity in Mohachao Narel, a Sweet Endosperm Coconut (Cocos nucifera L.) Population from Maharashtra, India

National Academy Science Letters ◽

10.1007/s40009-013-0128-0 ◽

2013 ◽

Vol 36 (3) ◽

pp. 319-330 ◽

Cited By ~ 2

Author(s):

K. Samsudeen ◽

M. K. Rajesh ◽

D. D. Nagwaker ◽

Raghavan Reshmi ◽

P. Ajith Kumar ◽

...

Keyword(s):

Cocos Nucifera ◽

Cocos Nucifera L

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Cocos nucifera L. oil alleviates lead acetate-induced reproductive toxicity in sexually-matured male Wistar rats

Journal of Basic and Clinical Physiology and Pharmacology ◽

10.1515/jbcpp-2020-0281 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Olugbemi T. Olaniyan ◽

Olakunle A. Ojewale ◽

Ayobami Dare ◽

Olufemi Adebayo ◽

Joseph E. Enyojo ◽

...

Keyword(s):

Luteinizing Hormone ◽

Lead Acetate ◽

Wistar Rats ◽

Histological Analysis ◽

Cocos Nucifera ◽

Reproductive Toxicity ◽

Positive Control ◽

Negative Control ◽

Male Wistar Rats ◽

Cocos Nucifera L

Abstract Objectives Lead primarily affects male reproductive functions via hormonal imbalance and morphological damage to the testicular tissue with significant alteration in sperm profile and oxidative markers. Though, different studies have reported that Cocos nucifera L. oil has a wide range of biological effects, this study aimed at investigating the effect of Cocos nucifera L. oil on lead acetate-induced reproductive toxicity in male Wistar rats. Methods Twenty (20) sexually matured male Wistar rats (55–65 days) were randomly distributed into four groups (n=5). Group I (negative control)—distilled water orally for 56 days, Group II (positive control)—5 mg/kg bwt lead acetate intraperitoneally (i.p.) for 14 days, Group III—6.7 mL/kg bwt Cocos nucifera L. oil orally for 56 days and Group IV—lead acetate intraperitoneally (i.p.) for 14 days and Cocos nucifera L. oil for orally for 56 days. Rats were sacrificed by diethyl ether, after which the serum, testis and epididymis were collected and used for semen analysis, biochemical and histological analysis. Results The lead acetate significantly increases (p<0.05) testicular and epididymal malondialdehyde (MDA) levels, while a significant reduction (p<0.05) in sperm parameters, organ weight, testosterone and luteinizing hormone was observed when compared with the negative control. The coadministration of Cocos nucifera oil with lead acetate significantly increases (p<0.05) testosterone, luteinizing hormone, sperm parameters and organ weight, with a significant decrease (p<0.05) in MDA levels compared with positive control. Histological analysis showed that lead acetate distorts testicular cytoarchitecture and germ cell integrity while this was normalized in the cotreated group. Conclusions Cocos nucifera oil attenuates the deleterious effects of lead acetate in male Wistar rats, which could be attributed to its polyphenol content and antioxidant properties.

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