Inheritance of Aromatic Traits in a Yunnan Aromatic Rice Landrace without fgr allele

Abstract

Abstract The most important aroma component 2-acetyl-1-pyrroline(2-AP) in aromatic rice is accumulated due to the presence of the fgr gene on chromosome 8 in rice. In a previous study, during the detection of the fgr aroma gene in a large number of aromatic rice varieties, a Yunnan local aromatic rice variety Paishaxiangnuo, which does not contain the fgr gene, was found. In this study, the main aroma substances of this fragrant rice variety were found to be basically consistent with the composition of Diantun 502, a fragrant rice variety with the fgr gene, by GCMS, and the content of 2-AP, the main aroma substance, was higher in this variety than that of Diantun 502. It was found that the aroma genes contained in this variety were neither equipotent nor chained to fgr by the allelicity test. Therefore, there may be an undiscovered rice flavour gene in Paishaxiangnuo, a local aromatic rice variety in Yunnan, China, which can significantly increase the content of 2-AP, the main aroma substance of aromatic rice. The investigation and analysis of agronomic traits of the hybrid progeny of Paishaxiangnuo indicated that new aromatic rice varieties bred using Paishaxiangnuo should be focused on increasing the length of panicle as well as increasing the number of full grains and the productive Tiller number.