Abstract

MAQUEIRA LOPEZ, Lázaro A; TORRES DE LA NOVAL, Walfredo; PEREZ MESA, Samuel A  and  MOREJON, Rogelio. Dry matter accumulation in different organs of the rice plant (Oryza sativa L.) and its relationship to grain filling in the dry season. cultrop [online]. 2015, vol.36, n.2, pp. 49-55. ISSN 1819-4087.

With the objective of evaluating the dry matter accumulation in different organs in four rice cultivars and its contribution to grain filling this work was developed in Scientific and Technological Basic Unit from "Los Palacios". The cultivars INCA LP-5, Reforma, INCA LP-2 and J-104 were used and they were sowed over a Ferruginous Nodular Gley Petroferric soil in December of 2004, February of 2005 and January of 2006. The direct sowing technology was employed. Plant breeding activities were developed as recommended by Rice Crop Technical Instructive. A Randomized Blocks Experimental Design with four replications was carried out. The distribution of the dry mass of different organs of the main stem in 25 plants per plot was evaluated and the agricultural yield at 14 % of grain moisture was determined. The data matrix obtained was processed by principal components multivariate techniques and the relationship between yield and the variables more associated was determined by a regression analysis. The results showed that the second and the third internode of the rice plants main stems are considered the highest contribution photoassimilates reserve organs to the grain filling, besides the dry mass content of these organs in anthesis could be considered by breeders as an important element for selecting cultivars with high yield potential

Keywords : rice; dry matter content; yield; growth.

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