Selection of rice genotypes with greater seedling vigor under controlled conditions
Paulo Hideo Nakano Rangel, Orlando Peixoto de Morais, Cláudio Brondani, Priscila Nascimento Rangel, and Rosana Pereira Vianello Brondani
This study aimed to identify allele sources for seedling vigor in 65 rice genotypes, using the slantboard test in a germination chamber, and to determine the best parameter for evaluating seedling vigor. The experiment was arranged in the randomized block design with three replicate blocks. Root and primary leaf length data were collected from seedlings grown in the dark at 18 ºC, 15 days after sowing and at 25 ºC, ten days after sowing. The best performing genotypes for seedling vigor were included in Group 2, which contained red rice accessions. The vigor was best evaluated under controlled conditions (grown at 18 ºC, 15 days after sowing) through measurements of roots and primary leaves.