Genetic Variation for Anaerobic Germination and Emergence from Deeper Soil Depth in Oryza nivara Accessions

摘要

Anaerobic germination and emergence from deeper soil depth are two important traits for breeding rice suitable for direct seeded conditions.In order to evaluate genetic variation for these traits,a total of 300 Oryza nivara accessions were evaluated along with checks,of which,159 accessions germinated under anaerobic conditions indicating presence of immense variability in O.nivara.Of 159 accessions,69 germinated in submerged conditions and 90 germinated after removing water with availability of aerobic conditions,indicating two different mechanisms operating in O.nivara.Similarly,out of 300 O.nivara accessions,218 germinated from 6 cm and 95 germinated from 8 cm soil depth.The accessions that germinated from deeper soil depth had longer mesocotyl and coleoptile lengths.