Rice root-knot nematode(RRKN,Meloidogyne graminicola)and brown spot(BS,Drechslera oryzae)are serious constraints on the quality of rice grains,particularly under direct-seeded rice conditions in many parts of the worl...Rice root-knot nematode(RRKN,Meloidogyne graminicola)and brown spot(BS,Drechslera oryzae)are serious constraints on the quality of rice grains,particularly under direct-seeded rice conditions in many parts of the world.Developing rice varieties resistant to RRKN and BS will be the most effective and environmentally friendly management strategy.A total of 93 and 58 Oryza rufipogon accessions were screened against RRKN and BS,respectively,for two years under artificial inoculation conditions.Among the 93 O.rufipogon accessions。展开更多
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 ...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.展开更多
文摘Rice root-knot nematode(RRKN,Meloidogyne graminicola)and brown spot(BS,Drechslera oryzae)are serious constraints on the quality of rice grains,particularly under direct-seeded rice conditions in many parts of the world.Developing rice varieties resistant to RRKN and BS will be the most effective and environmentally friendly management strategy.A total of 93 and 58 Oryza rufipogon accessions were screened against RRKN and BS,respectively,for two years under artificial inoculation conditions.Among the 93 O.rufipogon accessions。
基金the Department of Science and Technology,India(Grant No.EMR/2017/003069).
文摘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.
