Genetic Variation and Heritability Estimates for Bunch Yield, Bunch Components and Vegetative Traits in Oil Palm Interspecific Hybrids

Meadow bromegrass (Bromus riparius Rehm.) is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it a major grass species for pasturing beef animals in this region. As relatively little breeding work has been done on this species, there is little information on its breeding behaviour. The main objective of this study was to estimate total genetic variability, broad-sense heritability, phenotypic and genetic correlations. Forty-four meadow bromegrass clones were evaluated for agronomic characters. Genetic variation for dry matter yield, seed yield, fertility index, harvest index, plant height, plant spread, crude protein, neutral detergent fiber and acid detergent fiber, was significant. Broad-sense heritability estimates exceeded 50% for all characters. Heritability estimates were at least 3.5 times greater than their standard errors. Phenotypic and genetic correlation between all possible characters were measured. There was general agreement in both sign and magnitude between genetic and phenotypic correlations. Correlations between the different characters demonstrated that it is possible to simultaneously improve seed and forage yield. Based on the results, it appears that the development of higher yielding cultivars with higher crude protein, and lower acid and neutral detergent fibers concentration should be possible.

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Phyllotaxis in the Oil Palm: Applications in Selection of Interspecific Hybrids

Annals of Botany ◽

10.1093/oxfordjournals.aob.a084433 ◽

1970 ◽

Vol 34 (5) ◽

pp. 1025-1035 ◽

Cited By ~ 4

Author(s):

R. L. THOMAS ◽

S. C. NG ◽

K. W. CHAN

Keyword(s):

Oil Palm ◽

Interspecific Hybrids ◽

Selection Of

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Genetic variability in time to germination of sugar-beet clusters

The Journal of Agricultural Science ◽

10.1017/s0021859600015598 ◽

1971 ◽

Vol 76 (1) ◽

pp. 27-32 ◽

Cited By ~ 7

Author(s):

J. P. Battle ◽

W. J. Whittington

Keyword(s):

Genetic Variation ◽

Genetic Variability ◽

Sugar Beet ◽

Maternal Effects ◽

Diallel Cross ◽

Wild Form ◽

Maternal Parent ◽

Germination Characteristics ◽

Heritability Estimates

SUMMARYAn analysis of germination characteristics of progeny from a diallel cross between five sugar-beet plants showed that the genotype of the maternal parent controlled to a marked extent the behaviour of the progeny. This may be related to the presence in the fruits of inhibitory substances.Some evidence was found for genie and maternal interactions but these were always of less importance than the maternal effects. Heritability estimates from parent, off spring regression and analysis of half-sib family variances demonstrated that genetic variation for germination characteristics had not been eliminated during the improvement of sugar beet from the wild form.

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Heritability of body size in a natural population of the Great Tit (Parus major) and its relation to age and environmental conditions during growth

Genetics Research ◽

10.1017/s0016672300024162 ◽

1988 ◽

Vol 51 (2) ◽

pp. 149-162 ◽

Cited By ~ 81

Author(s):

A. J. Van Noordwijk ◽

J. H. Van Balen ◽

W. Scharloo

Keyword(s):

Genetic Variation ◽

Body Size ◽

Environmental Conditions ◽

Heritability Estimate ◽

Phenotypic Change ◽

Phenotypic Variance ◽

Adult Size ◽

Environmental Variance ◽

Long Term Study ◽

Heritability Estimates

SummaryWe have analysed data on weight and tarsus length collected during a long-term study of natural populations of Great Tits to evaluate the relative importance of genetic variation in body size. Some of our data were collected over a 25-year period, and therefore include a relatively large sample of naturally occurring environmental conditions. An overall heritability estimate calculated from the uncorrected mean weights of breeding birds amounts to 0·5. This estimate is unlikely to be influenced by resemblance in environmental conditions between relatives. Heritability estimates based on the size of fledglings vary between zero and the value for adults, depending on the environmental conditions during growth. If the feeding conditions for the nestlings are poor, no resemblance between parents and offspring is observed. Selection against small nestlings acts strongly on the environmental variance. This is concluded from the higher heritability estimates in the same cohorts after survival for at least three months after fledging, compared to measurements on nestlings. Such selection acting differentially on the genetic and environmental components of the phenotypic variance has important consequences for our ability to make predictions of phenotypic change from measured natural selection. Nevertheless, the amount of genetic variation would allow rapid response should selection on adult size occur.

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Effects of Nitrogen, Phosphorus, Potassium and Magnesium on Growth of the Oil Palm

Experimental Agriculture ◽

10.1017/s0014479700005470 ◽

1972 ◽

Vol 8 (4) ◽

pp. 347-353 ◽

Cited By ~ 14

Author(s):

R. H. V. Corley ◽

C. K. Mok

Keyword(s):

Leaf Area ◽

Oil Palm ◽

Dry Matter ◽

Fertilizer Application ◽

Dry Matter Production ◽

Matter Production ◽

Oil Palms ◽

Net Assimilation ◽

Nitrogen Phosphorus ◽

Bunch Yield

SUMMARYPotassium application appeared to increase dry matter production and yield of oil palms, primarily by increasing leaf area, while nitrogen increased both leaf area and net assimilation rate. Responses to phosphorus and magnesium were harder to interpret. Production of vegetative dry matter attained a fairly constant level at the higher rates of fertilizer application, while the ratio of bunch yield to total dry matter production was little affected by fertilizer treatments. The importance of these results for oil palm breeding, and their possible value in diagnosing fertilizer requirements, are briefly discussed.

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AN RFLP MARKER, CB75A, PREDICTS FOR PALMITIC ACID CONTENT ACROSS SELECTED OIL PALM GERMPLASM AND INTERSPECIFIC-HYBRIDS

Journal of Oil Palm Research ◽

10.21894/jopr.2018.0061 ◽

2019 ◽

Cited By ~ 1

Author(s):

ZULKIFLI Y

Keyword(s):

Palmitic Acid ◽

Oil Palm ◽

Acid Content ◽

Interspecific Hybrids ◽

Rflp Marker ◽

Palmitic Acid Content

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Molecular identification and population genetic study of Elaeidobius kamerunicus Faust. (Coleoptera: Curculionidae) from Indonesia, Malaysia and Cameroon based on mitochondrial gene

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d210749 ◽

2020 ◽

Vol 21 (7) ◽

Author(s):

Van Basten Tambunan ◽

Ardha Apriyanto ◽

Walter Ajambang ◽

Culbertson Enow Etta ◽

Bandung Sahari ◽

...

Keyword(s):

Genetic Variation ◽

Molecular Identification ◽

Oil Palm ◽

Genetic Study ◽

Population Genetic ◽

Mitochondrial Gene ◽

Dna Barcode ◽

Coi Gene ◽

Population Genetic Study ◽

Elaeidobius Kamerunicus

Abstract. Tambunan VB, Apriyanto A, Ajambang W, Etta CE, Sahari B, Buchori D, Hidayat P. 2020. Molecular identification and population genetic study of Elaeidobius kamerunicus Faust. (Coleoptera: Curculionidae) from Indonesia, Malaysia and Cameroon based on mitochondrial gene. Biodiversitas 21: 3263-3270. Oil palm pollinating weevil Elaeidobius kamerunicus is a very important insect pollinator in oil palm plantation. However, there is still lack of information about molecular identification and population genetic study in this species. The purpose of this study was to explore the effectiveness of oil palm pollinating weevil identification using mitochondrial DNA of COI gene and to assess its genetic variation between different locations and countries. We sequenced the DNA barcode of 36 individuals of this species using the mtDNA Cytochrome Oxidase I (COI) gene to explore their genetic variation, identity and phylogenetic relationship. The COI gene sequences generated from this study were successful in identifying E. kamerunicus. Phylogenetic analysis also revealed 3 well-supported monophyletic haplogroups of E. kamerunicus population. In addition, genetic differentiation analysis revealed that most populations from Indonesia were different from Malaysian and Cameroonian populations indicating that there was a genetic variation between the population samples from these countries. The overall E. kamerunicus used in this study were geographically structured in two regions; outside Indonesia region (Cameroon and Malaysia) and Indonesia region. These results demonstrate the feasibility of using COI gene sequence for molecular identification and population genetic study of E. kamerunicus species.

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470 Narrow-sense Heritability Estimates for Melon Root Traits

HortScience ◽

10.21273/hortsci.35.3.475a ◽

2000 ◽

Vol 35 (3) ◽

pp. 475A-475

Author(s):

Kevin M. Crosby

Keyword(s):

Genetic Variation ◽

Root System ◽

Block Design ◽

Root Systems ◽

Root Surface ◽

Root Tip ◽

Root Surface Area ◽

Narrow Sense ◽

Narrow Sense Heritability ◽

Heritability Estimates

Improving melon root systems by traditional breeding is one component of the program to develop multiple-stress-resistant melons at the Texas Agricultural Experiment Station, Weslaco. Ten diverse melon lines representing four horticultural groups were intercrossed utilizing a Design II mating scheme. The male parents were: `PI 403994,' `Perlita,' `Doublon,' `Caravelle', and `PI 525106.' The female parents were: `Créme de Menthe,' `Magnum 45,' `BSK,' `PI 124111 × TDI', and `Deltex.' F1 progeny were grown in pasteurized sand in the greenhouse using a randomized complete-block design with four reps. After 4 weeks, root systems from all plants were carefully washed to remove the sand. Each root system was then placed onto a glass, plated, and scanned into the computer software Rhizo Pro 3.8 (Regent Instruments, Quebec). This software calculated root lengths of various diameter classes, root area, and root tip number. All data was input into Agrobase software for calculation of genetic variances based on Design II analysis. Significant differences of contributions by male parents to progeny variation were few. Only length of roots with 1.0- to 1.5-mm-diameter and vine length were significantly different. Differences in contributions by female parents to all traits except root tip number were highly significant. No significant interaction effects were observed for any trait. Narrow-sense heritability estimates were moderate to high for all traits. The range was from 0.56 for root tip number by males to 0.81 for both length of 0.5- to 1.0-mm-diameter roots and vine length for females. Estimates for total root length (0.76) and root surface area (0.77) were high. The lack of male by female interaction suggests very low dominance genetic variation and contributed to high heritability estimates, which represent predominantly additive gene action. Additive genetic variation allows more-efficient progress by selection, making the potential for root system improvement favorable.

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