Narrative
Twenty-four of the 'IR36' rice (Oryza sativa L.) trisomic seed stocks including ten primary trisomic lines, Triplo 1, 3, 4, 5, 7, 8, 9, 10, 11 and 12 (GSOR 101-110); seven secondary trisomic lines identified as 2n + 5S.5S, 7S.7S, 8S.8S, 8L.8L, 11S.11S, 11L.11L and 12S.12S (GSOR 111-117), seven telotrisomic lines identified as 2n + 2L, 3L, 7S, 8S, 9S, 10S and 12S (GSOR 118-124) and the disomic IR36 (GSOR 125) are being made available through the USDA ARS Genetic Stocks-Oryza (GSOR). These lines were imported from the International Rice Research Institute in the Philippines and the trisomic plants were reselected as mature plants in a quarantine greenhouse and seed from the selected plants was grown in the field for several years at Stuttgart Arkansas. Segregating trisomic plants were identified based on morphology and selections were confirmed by meiotic analysis. Data was collected on plant morphological (number of days to heading, plant height, panicle length, flag leaf length and width, number of seeds per panicle) and seed size traits from segregating trisomic plants. Rice trisomic plants have been used to locate genes on chromosomes, associate linkage groups or DNA clones to chromosome(s), and to develop chromosome specific DNA markers.