Flowering and Pod Set Phase II

The appearance of the first flower (growth stage R1) marks the beginning of reproductive growth and the beginning of Murata's (1969) phase II - the formation of flower organs and the 'yield container'. Phase II ends shortly after the beginning of growth stage R6, at which time all fruits that will survive to maturity are established and there will be no changes in the number of fruits during the rest of reproductive growth (Fig. 6.1) (Board and Tan, 1995; Egli, 1997). The potential size of the yield container is determined by the number of seeds that are set (a function of fruit number and seeds per fruit) and the potential size of the seed (Egli, 1998).

2000

Control

1800

g 1200-

1000-

1600-

Control

Shade application date (days after R1)

Fig. 6.1. Effect of shade on seed production in the field. Shade cloths that reduce the incident solar radiation by 80% were placed over the plants at six dates after growth stage R1 and left in place until maturity. The dashed line represents the seed number on control (unshaded) plants. There was no significant difference (P = 0.05) between seed number on the control and shaded plants at the last shade treatment. Reproductive growth stages are shown on the x-axis. Plants were irrigated to minimize water stress (Egli, 2007, unpublished data).

Shade application date (days after R1)

Fig. 6.1. Effect of shade on seed production in the field. Shade cloths that reduce the incident solar radiation by 80% were placed over the plants at six dates after growth stage R1 and left in place until maturity. The dashed line represents the seed number on control (unshaded) plants. There was no significant difference (P = 0.05) between seed number on the control and shaded plants at the last shade treatment. Reproductive growth stages are shown on the x-axis. Plants were irrigated to minimize water stress (Egli, 2007, unpublished data).

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