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Kernel Set in Maize Hybrids and Their Inbred Lines Exposed to Stress

Dep. of Plant Agriculture, Crop Science Building, Univ. of Guelph, Guelph, ON, Canada, N1G 2W1. Financial support, in part, from the Ontario Ministry of Agriculture and Food, Natural Science and Engineering Research Council, and Ontario Corn Producers' Association. L. Echarte was supported by a postgraduate scholarship from OAS

View larger version (34K): [in a new window]   Fig. 1. Relationship between kernel no. plant–1 and plant growth rate during a period bracketing silking for two hybrids (CG60 x CG102 and CG60 x MBS1236) and their three parental inbred lines (CG60, CG102, and MBS1236) exposed to water stress (W, 2003 and 2004) and plant density stress (PD, 2004). r2 = 0.60, 0.46, and 0.53 for Model [1] fitted to CG60, CG60 x CG102, and CG60 x MBS1236, respectively; and r2 = 0.51 and 0.43 for Model [2] fitted to CG102 and MBS1236, respectively. GDD = growing degree-day.

View larger version (20K): [in a new window]   Fig. 2. Fitted equations to the relationship between kernel no. plant–1 and plant growth rate during a period bracketing silking depicted in Fig. 1, for (a) the hybrid CG60 x CG102 and its two parental inbred lines CG60 and CG102, and for (b) the hybrid CG60 x MBS1236 and its two parental inbred lines CG60 and MBS1236. GDD = growing degree-day.

View larger version (26K): [in a new window]   Fig. 3. Frequency distributions of kernel no. plant–1 for plants with plant growth rate during the period for kernal set bracketing silking (PGRS) in the range 0.15 > PGRS > 0.19 g plant–1 GDD–1 for two hybrids (CG60 x CG102 and CG60 x MBS1236) and their three parental inbred lines (CG60, CG102, and MBS1236) exposed to water stress (W, 2003 and 2004) and plant density stress (PD, 2004).

View larger version (35K): [in a new window]   Fig. 4. Relationship between kernel no. plant–1 and ear growth rate during a period bracketing silking for two hybrids (CG60 x CG102 and CG60 x MBS1236) and their three parental inbred lines (CG60, CG102, and MBS1236) exposed to water stress (W, 2003 and 2004) and plant density stress (PD, 2004). r2 = 0.74, 0.75, 0.72, and 0.63 for Model [1] fitted to CG102, CG60, CG60 x CG102, and CG60 x MBS1236, respectively; and r2 = 0.54 for Model [2] fitted to MBS1236. GDD = growing degree-day.

View larger version (23K): [in a new window]   Fig. 5. The proportion of the difference in kernel no. plant–1 (KNP) between the inbred line CG60 and the hybrids (a) CG60 x CG102 and (b) CG60 x MBS1236 that is associated with ear growth rate during the period bracketing silking (EGRS). Open symbols indicate values of KNP and EGRS at a PGRS interval from 0.1 to 0.2 g plant–1 GDD–1 (GDD = growing degree-day; and for CG60 and the hybrids, respectively). Closed symbols indicate values of KNP and EGRS at a PGRS interval from 0.3 to 0.4 g plant–1 GDD–1 ( and for CG60 and the hybrids, respectively). The total difference in KNP between the inbred line CG60 and the hybrid is equal to AC and the proportion of the difference in KNP that is associated with the difference in EGRS is equal to AB/AC.