Phenotypic screening for days to heading in rice upon exposure to rainfed lowland ecosystems
2015
Lumanglas, P. | Ishimaru, T.
Regulation of heading date is one of the key determinants of adaptation in rice. Drought is one of rice's most important abiotic stresses and even mild drought stress can result in significant yield reduction in a rainfed ecosystem. In this study, a Single Nucleotide Polymorphisms (SNPs) panel collection consisting of 326 O. sativa inbred accessions were screened for days to heading (DTH) between irrigated and rainfed ecosystems in IRRI. Days to heading of the O. sativa inbred accessions were investigated in the dry and wet seasons of 2014 as preliminary screening, with a single replication in each crop season. Fifty-accessions were observed to have earlier and later heading in the rainfed ecosystem than those in the flooded ecosystem. Twenty-seven accessions showed accelerated heading in the rainfed ecosystems, ranging from 7 to 15 days earlier. From the 27 early DTH accessions selected, 11 were classified as short-duration varieties, whereas 16 accessions were classified as normal-duration varieties. On the other hand, 26 accessions showed delayed heading in the rainfed ecosystem, ranging from 7 to 20 days later. From the 26 late DTH accessions selected, 17 accessions were classified as short-duration varieties, whereas 9 accessions were classified as normal-duration varieties. The results indicated the possibility that there may be genetic resources which can modify DTH under rainfed field conditions. The experiment is currently being repeated with more replications to identify genotypes.
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