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<i>Oryza</i>Wild Species: An Alternative for Rice Breeding under Abiotic Stress Conditions

American Journal of Plant Sciences 2018年第6期9卷 1093-1104页

作者： Viní cius Jardel Szareski Ivan Ricardo Carvalho Tiago Corazza da Rosa Simone Morgan dellagostin alan junior de pelegrin Mauricio Horbach Barbosa Osmarino Pires dos Santos Dionei Schmidt Muraro Velci Queiró z de Souza Tiago Pedó Tiago Zanatta Aumonde Camila Pegoraro Federal University of Pelotas Pelotas Brazil Federal University of Santa Maria Santa Maria Brazil Federal University of Pampa Bag&eacute Brazil

Rice (Oryza sativa L.) presents a strategic role in social and economic levels. The aim of this study was to elucidate the presence of genetic variability for the genus Oryza, and the possibility of using genotypes with wild characteristics in rice breeding programs. The Oryza genus shows great genetic variability through wild genotypes available in the most varied environments around the world. The negative effects imposed by abiotic stresses such as flood, salinity, low temperatures, water deficiency and high temperatures may be minimized by the efficient identification of a genetic variability source from the Oryza genus. Among the main wild species presented by the Oryza genus, Oryza glumaepatula stands out being an active source of germplasm. The occurrence and preservation of genetic variability of Oryza genus is indispensable to obtain new rice genotypes, to guarantee food security for the human population, as well as to develop genotypes that adapt to climatic changes and natural adversities.

关键词： Oryza sativa Beeding Germplasm Source Genetic Variability

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Adaptability, Stability and Multivariate Selection by Mixed Models

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American Journal of Plant Sciences 2017年第13期8卷 3324-3337页

作者： alan junior de pelegrin Ivan Ricardo Carvalho Andrei Caíque Pires Nunes Gustavo Henrique demari Vinicíus Jardel Szareski Mauricio Horbach Barbosa Tiago Corazza da Rosa Mauricio Ferrari Maicon Nardino Osmarino Pires dos Santos Marcos deon Vilela de Resende Velci Queiróz de Souza Antonio Costa de Oliveira Luciano Carlos da Maia Federal University of Pelotas Center of Genomics and Plant Breeding Avenida Eliseu Maciel Capao do Leao Brazil Federal University of Vicosa Center of Exact and Technological Sciences Vicosa Brazil Federal University of Santa Maria Frederico Westphalen Campus Frederico Westphalen Brazil Federal University of Pampa Campus Dom Pedrito Bagé Brazil

The aim of this work was to estimate the adaptability and stability of grain yield per hectare and percentage of crude protein of maize grains combined in an index, and to establish a multicharacter selection through mixed models based on an objective character and 15 auxiliary traits. The trials were conducted in the 2013/2014 agricultural year in four growing environments of the Rio Grande do Sul, BR state. The experimental design was randomized blocks arranged in a factorial scheme, being four growing sites × 15 single cross maize hybrids, arranged in three repetitions. The genotypic index, composed by the grain yield and the crude protein percentage in the grains, is the best selection strategy to achieve maize superior genotypes. The multivariate genotypes selection, considering grain yield and crude protein, is efficient. The genotypes FORMULA TL®, AS1656PRO®, P30F53Hx®, LG6304YG®and 30F53 are more adapted and stable for grain yield and percentage of crude protein, in the conditions of this study. The mixed models were efficient to employ the multicharacter selection and to contribute for maize genetic breeding.

关键词： Plant Breeding Zea mays L. Phenotypic Index Genetic Parameters Multicharacter

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