Effects of four plant regulators on the growth and development of fruit brush and postharvest seed dropping of'Thompson Seedless'grape
'Thompson Seedless'grapes are an important fresh food and dry-jujube cultivar in our country,but there are many problems of after-harvest grain falling in production.Four kinds of plant growth regulator treatments(100 mg/L S-ABA,10 μmol/L MeJA,100 mg/L NAA+100 mg/L 6-BA,25 mg/L 2,4-D)were set up to study the changes of'Thompson Seedless'seed shattering rate and stem tension,as well as the relationship between fruit brush and other related indicators.The results showed as follows:the grain breaking rate decreased and the stem tension increased in 2,4-D treatments,and the stained area of lignin under the conditions of longitudinal and cross-cutting of the corresponding fruit brush was significantly larger than that of other treatments.There was a significant negative correlation with the grain breaking rate and a significant positive correlation with the stem tension,while there was no such correlation with cellulose.The upper pericarp thickness of 2,4-D treatment was significantly higher than that of other treatments,which was negatively correlated with the grain breaking rate,and significantly positively correlated with the tension of fruit stem,the length of fruit brush,and the stained area of lignin in the longitudinal and transverse sections of fruit brush.However,the middle pericarp thickness had no similar relationship with other indexes.According to the results of principal component analysis,the comprehensive evaluation of 9 indexes showed that the four treatments improved the tension resistance of fruit stems from strong to weak,25 mg/L 2,4-D＞10 μmol/L MeJA＞100 mg/L NAA+100 mg/L 6-BA＞100 mg/L S-ABA.In conclusion,brush length and lignin content of'Thompson Seedless'grapes are important factors affecting the shattering rate,and it is proved that 2,4-D could induce lignin accumulation in the brush,providing scientific basis for the prevention and control of fruit shattering.
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