Agro-morphological characterization and purity assessment of mestizo rice (PSB Rc 72 H) from different seed sources
2005
Dela Rosa, A.M. | Adeya, C.C. | Hernandez, J.E., Philippines Univ. Los Baños, College, Laguna (Philippines). Dept. of Agronomy | Gaspar, M.M. | Masajo, I.M., Philippine Rice Research Inst., Science City of Muñoz, Nueva Ecija (Philippines)
Twenty nine mestizo hybrids produced during the 2003 dry season by PhilRice, different seed growers and cooperatives and SL Agritech were compared morphologically to mestizo produced by IRRI. Experiments were laid out in randomized complete block design with 4 replications and plot size of 6 sq m. Agro-morphological data were collected at different growth stages, and purity of the samples was assessed. Analysis of variance showed no significant differences among entries in terms of leaf length and width, culm length, tiller number, panicle length, grain length and width, 1000-grain weight, number of spikelets per panicle, and grain yield. Morphologically the same with Mestizo 1 produced by IRRI were the 29 entries in traits like color of blade, basal leafsheath, collar, ligule, auricle, apiculus, seed coat, and sterile lemma, leaf angle, blade and lemma-palea pubescence; leaf angle; panicle and endosperm types, secondary branching, and grain scent. The differences were observed in terms of panicle exsertion, stigma and node color, awning, spikelet fertility and flagleaf angle, and these could be attributed to off-types present in samples. Generally, results showed that Mestizo 1 test samples were identical to the hybrid produced by IRRI. Purity evaluation of the different entries showed that IR58025 A was the most common mixture in the samples, indicating the presence of IR58025 B during AxR F1 seed production. Other off-types were IR58025 B and some inbreds. Extent of purity in the entries evaluated ranged from 68.6% to 94.2%. To avoid mechanical mixtures resulting in seed stock impurity, recommended procedures and quality checks at all stages of hybrid rice production from seed soaking to harvesting and post-harvest handling should strictly be followed.
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