Effects of ringing and cutting off growing-tip on shoot growth and
 carbon-nitrogen metabolite accumulation in leaves of pecan

doi:10.3969/j.issn.1000-2006.201703025

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (06): 8-12.doi: 10.3969/j.issn.1000-2006.201703025

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Effects of ringing and cutting off growing-tip on shoot growth and carbon-nitrogen metabolite accumulation in leaves of pecan

FENG Gang¹, PEI Wen², WU Yayun², QU Kaijun², LI Xiaofei¹, PENG Fangren^1*

1.Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China; 2.Jurong Agriculture Committee, Jurong 212400, China

Online:2017-12-18 Published:2017-12-18

Abstract

Abstract: 【Objective】The present study investigated reasonable and efficient pruning methods in pecan(Carya illinoinensis), in order to provide a theoretical basis for cultivating a high-yield. 【Method】Different-size branches of ‘Pawnee', a 5-year-old pecan cultivar, were used as experimental materials to study the effects of ringing and cutting off the growing-tips on the growth of branches and the accumulation of carbon-nitrogen metabolites in leaves. 【Results】 The lengths of branches in group A(20-25 cm in length), B(30-35 cm in length)and C(40-45 cm in length)were lower than the control, while the diameters of A, B and C branches were higher than the control, after ringing treatments. The length of A branches was lower than the control by 22.09%, and the difference in diameter between the C branches and the control was the largest. The content of soluble sugar in leaves exhibited an increasing trend, while starch and soluble protein contents showed an up-down pattern. The content of carbon-nitrogen metabolites in the leaves of A, B and C branches was higher than that in the leaves of the control. The content of soluble sugars constantly increased, and other indices showed an increasing trend initially and then a decreasing trend. The length of the A, B and C branches was lower than the control, while the diameter and carbon-nitrogen metabolite content in all groups were higher than those in the control after cutting off the growing-tips. However, the carbon-nitrogen metabolite contents showed different trends among the groups. The average number of new developmental branches in group C was two, with a maximum length of 26.75 cm and a maximum diameter of 8.86 mm. The content of carbon-nitrogen metabolites in group B was significantly different compared to that in the control. 【Conclusion】 The cutting off growing-tip treatment inhibited the growth of branches in length, and promoted the growth of branches in diameter. Branches in group C sprouted buds, and showed the best response to treatments.

CLC Number:

S664
Q945.12

FENG Gang, PEI Wen, WU Yayun, QU Kaijun, LI Xiaofei, PENG Fangren. Effects of ringing and cutting off growing-tip on shoot growth and carbon-nitrogen metabolite accumulation in leaves of pecan[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2017, 41(06): 8-12.

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Effects of ringing and cutting off growing-tip on shoot growth and carbon-nitrogen metabolite accumulation in leaves of pecan

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