engleski

Chlorophyll a fluorescence parameters of JIP-test in maize breeding for water-limited environments

Chlorophyll fluorescence parameters of JIP-test are considered as reliable early indicators of stress in photosynthetic tissues. The JIP-test is particularly useful for crop plants when applied in vivo under field drought stress conditions. Our previous investigations in maize showed that inbred lines B73 and Mo17 remarkably differed for two most important fluorescence parameters (Fv/Fm and Performance Index) under the very dry scenario. Subsequent QTL analysis of the intermated B73xMo17 (IBM) maize population revealed 10 significant QTLs for seven JIP test parameters, of which five were co-localized when combined over the four environments indicating polygenic inheritance. Our results demonstrated that QTL analysis of chlorophyll fluorescence parameters was capable of detecting one pleiotropic locus on chromosome 7, coinciding with the gene gst23 that may be associated with efficient photosynthesis under the field scenarios differing in water supply. Converging approaches of genomic selection and challenging high-throughput phenotyping for chlorophyll fluorescence parameters in the water-limited field environments could eventually improve breeding in drought tolerant maize.

Chlorophyll a fluorescence parameters ; intermated B73xMo17 recombinant inbred lines ; JIP-test ; maize ; quantitative trait loci

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