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Heat Stress Effects on Protein Accumulation of Maize Endosperm

^a Dep. of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA
^b Dep. of Horticultural Science, University of Minnesota, St. Paul, MN 55108, USA

View larger version (94K): [in a new window]   Fig. 1. Effects of heat stress (control, 2, and 4 DHS) applied during the early stages of maize kernels. Photographs were taken at 20 DAP.

View larger version (41K): [in a new window]   Fig. 2. The effects of heat stress [control (ct), 2 (2d), and 4 (4d) DHS] on dry weight accumulation of endosperm (A and C) and embryo (B and D) of developing maize kernels of growth chamber- (A and B) and field-grown plants (C and D). Values are means, compared by LSD at 5% (*) or 1% (**) levels of significance.

View larger version (41K): [in a new window]   Fig. 3. The effects of heat stress [control (ct), 2 (2d), and 4 (4d) DHS] on dry weight accumulation of pericarp (A and C) and pedicel (B and D) of developing maize kernels of growth chamber- (A and B) and field-grown plants (C and D). Values are means, compared by LSD at 5% (*) or 1% (**) levels of significance.

View larger version (46K): [in a new window]   Fig. 4. Effects of heat stress [control (ct), 2 (2d), and 4 (4d) DHS] on albumins plus globulins (A and D), zein (B and E), and glutelin (C and F) concentrations in endosperms of growth chamber- (A to C) and field-grown kernels (D to E). Values are means, compared by LSD at 5% (*) or 1% (**) levels of significance.

View larger version (35K): [in a new window]   Fig. 5. Effects of heat stress [control (ct), 2 (2d), and 4 (4d) DHS] on zein concentration in endosperms of growth chamber (A–E) and field-grown kernels (F–J). The 27-kDa zein (A and F), 19 + 22-kDa zeins (B and G), 16-kDa zein (C and H), the 15-kDa zein (D and I), and the 10-kDa zein (E and J) were analyzed. Values are means, compared by LSD at 5% (*) or 1% (**) levels of significance.

View larger version (48K): [in a new window]   Fig. 6. Effects of heat stress [control (ct), 2 (2d), and 4 (4d) DHS] on albumins plus globulins (A and D), zein (B and E), and glutelin (C and F) content in endosperms of growth chamber (A–C) and field-grown kernels (D–E). Values are means, compared by LSD at 5% (*) or 1% (**) levels of significance.