Desenvolvimento de materiais de arroz (Oryza sativa L.) irrigado, tolerantes à salinidade dos solos por induÃÃo com raios gama / DEVELOPMENT OF IRRIGATED RICE (Oryza sativa L.), SOIL SALINITY TOLERANT, BY MEANS OF GAMMA RAY INDUCTION

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Rice mutants were studied, in relation to salt tolerance in soil, after 60Co gamma radiation induction. The effects of (60 Co) gamma radiation during the germination of rice genotypes (at 5 and 14 days), were evaluated under different levels of salt stress. The salinity level of 1.8 Mpa (5.0 dS.m â1) prevented the germination of seeds until 14 days, and 1.2 MPa (3.3 dS.m â1) had a differential effect among the varieties. The doses of radiation utilized (120- 360 Gy) did not interfere in the germination of the seeds. The (60 Co) gamma radiation effects on five genotypes of irrigated rice were evaluated. The dose of 360 Gy negatively affected the rice varieties regarding the number of seedlings, the production of green and dry matter, leaf area, germination, vigour and height of plant. The doses of radiation below 300 Gy did not have any significant effect on the parameters evaluated. The effects of (60Co) gamma radiation on rice genotypes under different salt stresses were also studied. There was a significant difference among the varieties but only during the state of flowering. The doses of radiation showed a significant interference only in the harvest; the higher the dose used, the more days to the cropping. The level of salinity applied in the experiment influenced the germination, number of seedlings, height of plant, vigour, leaf area, fresh and dry matter and days up to flowering and to cropping

ASSUNTO(S)

salinidade dos solos salinity in soil mutantes de arroz rice mutants radiaÃÃo gama gamma radiation engenharia nuclear

ACESSO AO ARTIGO

Documentos Relacionados