Biological Regulation of Growth Regulator on Jujube Fruit Development

Abstract

A B S T R A C TIn order to research the influence of different plant growth regulators on the cell development and quality of red jujube fruits, we used the composite spraying method of three growth regulators including GA3, CPPU and ALA. After spraying growth regulators, the red jujube flesh subject to T5 (5 mg LG 1 5-ALA+2 mg LG 1 Na 2 SO 4 +10 mg LG 1 GA3+10 mg LG 1 +5 mg LG 1 CPPU) and CK (20 mg LG 1 GA3) treatments would have maximum intercellular space on the whole. As time went by, the intercellular space of pericarp subject to CK treatment would further enlarge. However, the intercellular space of pericarp subject to T1 (20 mg LG 1 5-ALA+2 mg LG 1 Na 2 SO 4 ) treatment decreased gradually. When high-concentration gibberellin was sprayed to red jujubes separately, the secretory cavity of flesh cells was the largest. Moreover, it would be absorbed along with the growth. However, for red jujubes subject to other treatments, the changes to secretory cavities were not significant. The sizes of the flesh cells of red jujubes subject to each treatment were all larger than that of the contrast group. Compound of 5-ALA and CPPU had more significant effect on enlarging the flesh cells of red jujubes in comparison with GA3. Compound of 10 mg LG 1 CPPU and low-concentration 5-ALA or spraying high-concentration 5-ALA separately could achieve satisfactory effect. The Vc content in the fruits could effectively increase and sugar-acid ratio could be improved by using T1 treatment. The total nitrogen and total phosphorus contents in jujubes could effectively increase by using T5 treatment, thus increasing its nutritional value. Cooperation of CPPU and 5-ALA can prevent adverse symptoms of high concentration gibberellin on red jujubes and T1 treatment can effectively increase cell size and diminish the cell gap of red jujube fruit and then it may improve the quality of jujube.