Characterization of Lowland Rice Genotypes (F6-7) for Variability in Agronomic and Morphological Traits in Iron-Toxic Environment
Journal Title: International Journal of Agriculture Innovations and Research - Year 2018, Vol 7, Issue 2
Abstract
One of the most devastating abiotic stresses in the Inland Valley Swamps (IVS) for the production of rice is iron toxicity. Indigenous rice farmers find it very difficult to cop and manage these constraints in the IVS like; prolong flooding, pest and diseases. Reports indicated that in W/Africa, rice yield reduced as much as 12-100% as a result of iron toxicity. This investigation was conducted at the Rokupr Agricultural Research Center, in one of the rain-fed IVS swamps proven to be iron toxic, during the 2016 wet season. The planting materials consisted of 58 entries of F6-7 population and with three lowland check varieties which possess diverse traits of (susceptibility and tolerance) to iron toxicity, RYMV and Rice Blast. Due to iron excess effect, six of the genotypes tested failed to survive in the permanent field after the seedlings had been transplanted. Results showed that 59.3% of the total 61 genotypes investigated had grain yield lower the grand mean, which indicated drastic grain yield reduction. Impressively, G26 produced significantly the highest grain yield component than Rok-24 (tolerance check) and most importantly, 40.7% of the genotypes produced higher grain yield and yield component above the grand mean and more than the (susceptible checks) and the other genotypes. Stress parameters score rating classified G5, G7, G9, G12, G14, G18, G26, G37, G454, and G55 as significantly tolerant to iron toxicity. The evaluated rice genotypes exhibited a considerable morphological variability. However, the dendogram produced six cluster groups where cluster (I), (II) and (III) consist 15, 9 and 3 genotypes respectively which produced the best trait performance of all the clusters. Meanwhile, genotypes identified as high iron toxicity tolerant with better yield and agronomic performance should be re-conducted in multi-location field trails in iron toxic environments to confirm the conclusions before making concrete recommendations.
Authors and Affiliations
Ibrahim Mansaray, et al.
Keywords
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