![]() A region on chromosome 1 regulates both the fluorescence shift indicative of the longer term ionic stress and the early growth rate decline during salinity stress. Fluorescence imaging identified four genomic regions linked to salinity-induced fluorescence responses. A genomic region on chromosome 3 was strongly associated with the early growth response and was captured using visible range imaging. In an effort to address this challenge, we generated temporal imaging data from 378 diverse rice genotypes across 14 d of 90 m m NaCl stress and developed a statistical model to assess the genetic architecture of dynamic salinity-induced growth responses in rice germplasm. The genetic basis of these physiological responses is predicted to be polygenic. The genetic resources for salt tolerance in rice germplasm exist but are underutilized due to the difficulty in capturing the dynamic nature of physiological responses to salt stress. Rice ( Oryza sativa), the most important food crop, is salt sensitive. Salinity affects a significant portion of arable land and is particularly detrimental for irrigated agriculture, which provides one-third of the global food supply.
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