Genotype and Seeding Date Effects on Performance of Mangrove Rice (Oryza sativa L.) In the Cross River Estuary

Binang, W. B.; Ntia, J. D.; Shiyam, O.J.

doi:10.3923/ja.2012.79.84

Cited by 2 publications

(1 citation statement)

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“…With climate change, the occurrence of flooding and saltwater intrusion is of increasing concern. Utilization of landraces able to withstand these production constraints, which may be those collected from mangrove swamps or hydromorphic areas, will benefit breeders worldwide (Binang et al., 2012). Of the Indica landrace accessions in G1, 146 had early maturity (90–105 days to maturity) and 922 intermediate maturity (105–150 days; Table S1).…”

Section: Resultsmentioning

confidence: 99%

Genetic variation and population structure of Oryza sativa accessions in the AfricaRice collection and development of the AfricaRice O. sativa Core Collection

et al. 2023

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Genetic diversity studies provide an increased understanding of genebank collections and enhance their use for improving global food security. This study explores the genetic variation and population structure of 5738 rice (Oryza sativa L.) accessions representing 39.6% of the O. sativa collection conserved in the AfricaRice genebank of which 74.0% originated from African countries. These accessions were genotyped with 25,904 polymorphic DArTseq-based single nucleotide polymorphisms (SNPs). Genetic distances between pairs of accessions indicate high variability, with 21.0% of pairs being moderately distant and 78.2% highly distant from each other. The genotyped accessions are traditionally grown in six different agro-ecologies from 73 countries. Using neighbor-joining tree, principal component, and modelbased population structure analyses, the accessions were divided into four genotypic groups representing the two O. sativa subspecies, Japonica (787 accessions) and Indica, which were further divided into landraces (1879 accessions), and improved cultivars (3027 accessions), and a fourth small group of admixed accessions. Subclusters identifying a specific agro-ecology (upland, lowland, and mangrove swamp) or originating country were noted. Using the maximum length sub-tree method, we selected 10% of the total accessions to form the "AfricaRice O. sativa Core Collection" (AROSCC). The subset of 600 O. sativa accessions captures more than 95% of the SNP polymorphisms in the entire collection. The AROSCC is an important resource to support pre-breeding and rice improvement programs around the world.

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Section: Resultsmentioning

confidence: 99%

Genetic variation and population structure of Oryza sativa accessions in the AfricaRice collection and development of the AfricaRice O. sativa Core Collection

et al. 2023

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Response of Some Improved Upland Rice Varieties to Different Sources and Rates of Nitrogen Fertilizer in A Humid Rain Forest Region

Esang¹,

Ikeh²

2021

AJASET

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ABSTRACT Nitrogen (N) is a major lacking nutrient element for the growth and yield of cereal crops Calabar, it is necessary to determine the response different sources and rates of N in four varieties of upland rice. Treatments comprised factorial combinations of the four rice varieties (NERICA 1, NERICA 2, FARO 45, FARO 48), three straight inorganic N sources (urea, Calcium ammonium nitrate, ammonium sulphate) and four levels of N (0, 30, 60, 90 kg N ha-1) laid in randomized complete block design. The N was split applied twice; one-third at the beginning of tillering and the remainder at panicle initiation. The results showed that the source of fertilizer N did not affect significantly the growth and yield of the rice crop (p=0.05). Considering that soils in Calabar are acid sands it will not be advisable to consistently apply such acidifying fertilizers as ammonium sulphate or urea except with soil liming which will undoubtedly increase the cost of production and probably make it unprofitable to cultivate rice in the area. The fertilized crop grew taller and produced more biomass compared with the control. It also produced significantly more tillers hill-1, panicles m-2, grains panicle-1, weight of 1,000 grains and grain yield. However, whereas NERICA 1, NERICA 2 and FARO 45 were more responsive to lower N levels, the grain yield of FARO 48 was significantly higher when the crop received 90 kg N ha-1 compared with other varieties, probably because of its longer growth duration in the field. The responsiveness of these varieties to low N application was the result of their higher grain yield resulting from enhanced N use efficiency. Genotypes that were most responsive to low N input levels were early maturing with high N-use efficiencies. On the basis of grain yield, it is recommended that for high yield in the humid region of Cross River State, N should be applied at the rate of 60 kg ha-1 for early- and 90 kg ha-1 or above for the medium-maturing upland rice varieties. Keywords: Rice, Varieties, Growth and Yield

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Genotype and Seeding Date Effects on Performance of Mangrove Rice (Oryza sativa L.) In the Cross River Estuary

Cited by 2 publications

References 9 publications

Genetic variation and population structure of Oryza sativa accessions in the AfricaRice collection and development of the AfricaRice O. sativa Core Collection

Genetic variation and population structure of Oryza sativa accessions in the AfricaRice collection and development of the AfricaRice O. sativa Core Collection

Response of Some Improved Upland Rice Varieties to Different Sources and Rates of Nitrogen Fertilizer in A Humid Rain Forest Region

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