Page 147 - 《华中农业大学学报（自然科学版）》2022年第5期

第 5 期 余孝丰 等：适度干旱和叶喷调环酸钙对设施柑橘开花的影响 141

Effects of moderate drought and foliar spray of
spraying prohexadione calcium on flowering and

tree vigor of citrus under facility cultivation

2
1
1,2
1
YU Xiaofeng ,HUANG Bei ,JIN Longfei ,ZHANG Dejian ,WANG Peng 1
1.Institute of Citrus Research，Zhejiang Academy of Agricultural Sciences，
Zhejiang Province，Taizhou 318026，China；
2.College of Horticulture and Gardening，Yangtze University，Jingzhou 434025，China

Abstract The 3-year-old Cocktail grapefruit（Citrus paradise Osbeck.）grafted on trifoliate orange

（Poncirus trifoliate L.Raf.）cultivated with root restriction method under shelter from the rain was treated
with moderate drought（DR）and foliar spray of spraying 500 mg/L prohexadione calcium（PC），and the
conventional watering and fertilizing plants as control（CK）were used to study the effects of drought stress
and foliar spray of spraying prohexadione calcium on the flower formation and tree vigor of citrus under fa⁃
cility cultivation.The blossoming and shooting status were observed and recorded under DR，PC and CK
treatments in September，November 2021 and April 2022.The physiological parameters of tree vigor includ⁃
ing the content of chlorophyll a and b，carbon，total nitrogen，antioxidant enzyme activity in leaves were test⁃
ed before recovering with conventional watering.The results showed that the moderate drought effectively
delayed the flowering date in autumn，and the number of flowers per shoot increased remarkably in the fol⁃
lowing spring compared with the control.In comparison with CK，the content of chlorophyll b and soluble
protein and the enzyme activities of CAT and SOD increased significantly，while the net photosynthetic
rate，the content of total chlorophyll，the content of starch，the ratio of C/N and the enzyme activity of
POD were decreased in DR treatment.There were no significant changes of the date of flowering and the
number of flowers between PC treatment and CK in autumn，however the number of flowers per shoot in
spring was significantly increased in comparison with CK.The results of detecting physiological indicators of
tree vigor in PC treatment showed that the thickness and weight of leaves，the content of chlorophyll b and
total chlorophyll，the enzyme activity of CAT increased，whereas the content of starch，the ratio of C/N and
the enzyme activity of POD decreased compared with CK.It is indicated that the foliar spray of spraying pro⁃
hexadione calcium can regulate the vegetative and reproductive growth of cocktail grapefruit，and combined
with moderate drought，it can regulate the consistent and concentrated flowering of cocktail grapefruit under
facility cultivation.
Keywords Cocktail grapefruit（Citrus paradise Osbeck.）；facility cultivation；drought stress；pro⁃

hexadione calcium；flowering regulation

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