Studies On The Attachment Of Stem To The Berries And Turgor Pressure Of Berries In 'Thompson Seedless' Grape

This thesis studied the main reason on the berries to bear to pull and pressure badly and berry drop seriously regarding 'Thompson Seedless' grape as the material. The nutrient solution preparation(GA and nourishment),our new-developed product, was applied to increase the attachment of stem to the berries and the turgor pressure of berries and decrease the berry drop of 'Thompson Seedless' grape. The relation between the hormone, the cultivation measure and nourishment level and berry quality of storage and conveyance was searched. All above may provide the practical basis for the exaltation of berry quality of storage and conveyance. The acquisition's research is as follows:1 .'Thompson Seedless1 clusters were treated by momentarily dipping into a series of concentrations of GA3 solution .In maturation, all treatments increased the attachment of stem to the berries and turgor pressure of berries and berry weight .With fruits treated, there was no significant increase in berry quality more than 10mg·L-1.The attachment of stem to the berries and turgor pressure of berries was to attain biggest. Maximum berry weight was obtained with 500mg·L-1 applied. Among the concentration of 0-60mg·L-1,berry drop decreased gradually. When 60mg·L-1 GA3 was applied ,berry drop was the least ,for 36.5%.Then berry drop gradually go up along with the concentrations of GA3 increased. Maximum berry drop was obtained with 1000mg·L-12.Thompson Seedless clusters were dipped into solutions of GA3 at 0,20,40,60,80,100ppm GA3 on each of May 30, June 6, Junel4, June20,June 28, July 5.There were two peaks of optimum response of berry size, coinciding with the end of bloom stage and the beginning of fruit-set stage, but the result of treatment on June 6 was strikingly lower than that from treatments 1 week earlier or later. The effect of concentration of GA3 showed that the maximum berry size was obtained with this compound at 40ppm or higher.3.Maximum increase in berry size as a result of girdling occurred during a 2-week period. Maximum increased in the attachment of stem to the berries during a 1 -week period. The treatments of girdling on GArtreated vines had better effect.4.The treatments of A,B,R had better effect in 13 treatments that we researched to manufacture the nutrient solution preparation .The attachment of stem to the berries was respectively 425.1g ,446.7g ,453.4g ,enlarged 5.1 times compared with CK of 82.7gAnd the turgor pressure of berries were 2117.5g ,2000.0g ,2178.3g , increased 2.9 times than CK of 688.4g .The berry size of four treatments of A, B, C, R was respectively for 3.61g, 3.77g,3.78g, 3.63g, increased 2.47 times than CK of 1.46g.All treatments lowered berry drop, but the treatments of A, B, C, D, J, L, P, Q had better effect. Among them the berry drop of R treatment was least, 24.13%.But the berry drop of CK was 51.4 %. After these processed fruits were stored for 10 days in 0-4℃,we discovered that A, B, R treatments still preformed better.5.The clusters of Thompson Seedless' grape were sprayed with Ca(NO3)2 solution of 1.0%, 1.5%, 2.5%, 3.0%before 20 days in maturation .It was found (hat calcium treatment increased the storage life of the berries. The results of 1.5% Ca(NO3)2 solution was better . The turgor pressure of berries was 2453.3g, the attachment of stems to the berries was 460.0g, and the berry drop was 32.3% of GAvtreated 'Thompson Seedless 'grape. The turgor pressure of berries was 1430.3g , the attachment of stems to the berries was 117.0g , and the berry drop was 40.7% of no GAHreated 'Thompson Seedless' grape.