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Genetic and Physiological Analysis of an Irradiated Bloomless Mutant (Epicuticular Wax Mutant) of Sorghum

^a USDA-ARS, Plant Stress & Germplasm Development Unit, Cropping Systems Research Laboratory, 3810 4th St., Lubbock, TX 79415
^b contributed equally to this work. Inquiries about seeds and the population used in this study should be addressed to Dr. C.D. Franks. Mention of trade name does not constitute endorsement of the product to the exclusion of similar products by the USDA

View larger version (73K): [in this window] [in a new window]   Figure 1. Photographs of (A) BTx623 with profuse bloom or epicuticular wax and (B) bloomless mutant KFS2021 used in the study. The photographs show the abaxial side of fifth leaf and sheath of the fifth internode at anthesis.

View larger version (30K): [in this window] [in a new window]   Figure 2. Histograms of (A) leaf and (B) sheath wax loads of the F2 population. The F2 individuals with bloom are shown in solid black bars and F2 bloomless individuals are represented by hatched bars. Values for parents BTx623 and KFS2021 are indicated by arrows.

View larger version (22K): [in this window] [in a new window]   Figure 3. Histograms of (A) seedling water loss rate at 6 h after drying and (B) mean percentage of seedling water loss over an 8-h period for the two phenotypic classes in the F2 population. The F2 individuals with bloom are shown in solid black bars, and F2 bloomless individuals are represented by hatched bars. For Fig. 3B, regression analysis was used to estimate best fit line (with r2 = 0.99) and the rate of water loss for each of the phenotypic class. Best fit equation for the bloomless class is: % water loss = (3.54) (x) + 10.15, and for the bloom class is: % water loss = (2.22) (x) + 9.1, where x = time of harvest.

View larger version (25K): [in this window] [in a new window]   Figure 4. Histograms of (A) epidermal permeability expressed as % chlorophyll leaching at 6 h and (B) % guttation in the F2 population. The F2 individuals with bloom are shown in solid black bars and F2 bloomless individuals are represented by hatched bars. Values for parents BTx623 and KFS2021 are indicated by arrows.

View larger version (31K): [in this window] [in a new window]   Figure 5. Histograms of (A) nighttime and (B) daytime conductances of the F2 population. The F2 individuals with bloom are shown in solid black bars, and F2 bloomless individuals are represented by hatched bars. Values for parents, BTx623 and KFS2021 are indicated by arrows.