Abstract
Objective. The present study was aimed to elucidate the dynamic changes of endogenous hormone levels during the fruit growth and the changing regulation of endogenous hormone levels between normal and abnormal fruits. Methods. After using exogenous GA3 and GA3+6-BA, endogenous hormone levels such as indoleacetic acid(IAA), cytokinin(ZR), abscisic acid(ABA) and gibberellin(GA3) in normal fruits and rigid abnormal ones were determined by enzyme-linked immunosorbent assays(ELISA), respectively. Results. The results indicated that the treatments of 20mg/kg GA3 and the combination of 20mg/kg GA3+10 mg/kg 6-BA had no remarkable effects on increasing average weight of berries where the vertical diameter of grape fruits was longer than the transverse diameter. Exogenous hormone GA3 and GA3+6-BA mixture also affected the endogenous hormone levels. The content of IAA, ABA and ZR was lower in the rigid abnormal fruits than that in the normal ones, respectively, and those levels during the rapid growth period were nearly in accordance with those during the slow growth period. Conclusion. The fruit growth was closely related to the endogenous hormone levels.
Highlights
As for the rigid abnormal fruits, there was no significance between the transect and longitudinal diameter and the two diameters had almost no increment and were significantly lower than CK (Figure 1 and 2)
As for normal fruits, ZR content in A, B and CK was at a higher level which was 1962.87 ng/g FW, 4735.98 ng/g FW and 1283.19 ng/g FW, respectively, in early growth period, and decreased gradually to a lower level, almost undetectable; As for abnormal fruits, ZA level in A and B was significantly lower than that in CK, and since 23 days after blossom, there was no great difference in ZA level (Figure 4)
Plant growth regulators applied in production promoted growth through boosting cell division and increasing cell volume, which ascribed to comprehensive effects of many hormones
Summary
Cv.) growing at the million mu production base of the red globe grape, 83 Corps, N 5 Division, Xinjiang, were used in this experiment. Grape trees in the garden with strong tree vigor and complete structure have no diseases and pests and similar growth. Tree stands are all small frame with the planting spacing of 1×4m. Supplemental irrigation was provided and standard fertilization practices were followed. Grape trees of similar age and vigor were randomly selected, 4 trees as a block, 3 times replicate, 12 tress for trial altogether. Fruit clusters were processed with micro-jet of GA3(A) 20 mg/kg and the combination of 20 mg/kg GA3 +10 mg/kg 6-BA(B) 5 days before (22nd May) and 3 days after(2nd June) blossom respectively, water treatment used as control in the whole trial
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