Quantitative Genes Controlling Chlorophyll Fluorescence Attributes in Barley (Hordeum vulgare L.)

Chlorophyll fluorescence is one of the very useful techniques in plant physiology because of the ease with which the user can gain detailed information on the state of photosystem II (PSII) at a relatively low cost. Detection of quantitative traits loci related to chlorophyll fluorescence have a major role in understanding the genetic mechanisms of photosynthesis. In the present research, to mapping, the genome regions controlling chlorophyll fluorescence traits, barley (Hordeum vulgare L) from 106 F8 recombinant inbred lines caused by crossing two cultivars of Badia × Kavir was used and these lines were cultured in a complementary randomized design with two replications. Traits studied include ABS/CSo, TRo/CSo, DIo/CSo, ABS/CSm, DIo/CSm, psi (Eo), TRo/RC, REo/RC, ABS/RC, DIo/RC, Area, Fv/Fm, Sm. Linkage maps were prepared using 152 SSR polymorphic markers, 72 ISSR, 7 IRAP, 29 CAAT, 27 Scot, and 15 iPBS alleles. Molecular markers were assigned on 7 chromosomes of barley. The linkage map covered 999.2 cM of the barley genome and the average distance between two flanking markers was 3.387 cM. Three major QTLs were identified for Area, psi (Eo), and Dio/Rc on Chromosome 6 between ISSR31-1-Bmag0867 in position 62 Centimorgan that explained 17.2%, 31.5%, and 15.9%, respectively. Also, another colocation was detected for ABS/CSo, TRo/CSo, ABS/CSm, and DIo/CSm QTLs on chromosome 6 in position 72 Centimorgan. The results obtained in the present research provide valuable information on the genetic basis of the Chlorophyll fluorescence parameters that can be used in the barley breeding program, including marker-assisted selection.