Morphoagronomic descriptors of rice landraces varieties (Oryza sativa L.) from the state of Maranhão

Abstract

Rice landrace varieties are adapted to the most diverse environmental conditions, which is clearly important in periods of great climatic and sanitary uncertainties. However, there is a gap in their description in the literature. Maranhão, Brazil, has wide diversity in landrace seeds, with rice varieties that can significantly contribute to the genetic breeding of the species. Based on this information, the objective of the present study was to characterize the landraces rice varieties, through the description of the morphological and agronomic profile. The study analyzed 23 qualitative heredity descriptors and three quantitative descriptors in 21 rice landrace varieties from different locations in the state of Maranhão, according to the methodological procedures recommended by the National Cultivar Protection Service. A randomized block e experimental design was used (DBC), with 21 treatments and four replications. Considering complementing To complement the study, a multicategorical analysis was carried out between the 21 accessions, based on qualitative data obtained from the 22 morphological descriptors, which generated a dendrogram. The results showed that there are differences between the qualitative descriptors. Quantitative descriptors are highly significant, with regard to the number of tillers, with emphasis on the Edinho variety. The Quechi variety was responsible for one of the factors that most influences the rice yield, with the highest number of grains per panicle. The varieties Codozinho, Edinho, Palha Murcha and Pé Roxo, are more productive in number of panicles. The dendrogram formed three clusters with evidence of dissimilarities between the varieties. The results show that the landrace varieties differ in their morphoagronomic characteristics and can be valuable materials in the construction of a new, more sustainable agriculture.