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

FENG Gang, PEI Wen, WU Yayun, QU Kaijun, LI Xiaofei, PENG Fangren

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (06) : 8-12.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (06) : 8-12. DOI: 10.3969/j.issn.1000-2006.201703025

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 Fangren1*
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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.

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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 https://doi.org/10.3969/j.issn.1000-2006.201703025

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