Effects of different pruning measures on the photosynthetic characteristics
 of pecan seedlings

doi:10.3969/j.issn.1000-2006.201703024

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (06): 13-18.doi: 10.3969/j.issn.1000-2006.201703024

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Effects of different pruning measures on the photosynthetic characteristics of pecan seedlings

HAN Jie¹, ZHANG Ming², LIN Subao², SHANG Jing¹, LI Xiaofei¹, LIU Zhuangzhuang¹, PENG Fangren^1*

1. Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China; 2. Dongjin State Forestry Farm of Jurong City, Jurong 212400, China

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

Abstract

Abstract: 【Objective】The present study investigated efficient pruning measures in pecan(Carya illinoinensis), in order to provide a theoretical basis for cultivating a high-yield. 【Method】Branches of 5-year-old Carya illinoinensis seedlings were treated with scoring(T1), girdling(T2)or topping(T3)to study the differences between photosynthetic characteristics in the three treatments. 【Results】Photosynthetic parameters and diurnal variation curves and light response parameters(apparent quantum yield(A_QY), light compensation(L_CP), net photosynthetic rate(P_n), light saturation point(L_SP)and dark respiration rate(R_d))were different among treatments. Net photosynthetic rate(P_n), transpiration rate(T_r)and stomatal conductance(G_s)under the three treatments showed similar trends. The average size was T3 > T1 > T2, and the diurnal difference in intercellular CO₂concentration was opposite(T2 > T1 > T3). The maximum net photosynthetic rate(P_n,_max)and A_QY of different treatments were the highest, while the L_CP was significantly lower, in T3 compared to the other treatments. Additionally, L_SP and R_d were relatively low in T3. This showed that the pecan seedlings grafted with T3 treatment had the strongest photosynthetic capacity and better light adaptation. 【Conclusion】 Topping during the early flowering stage of pecan can effectively improve the photosynthetic capacity of leaves, while girdling and scoring can decrease the photosynthetic capacity.

CLC Number:

S664
Q945.11

HAN Jie, ZHANG Ming, LIN Subao, SHANG Jing, LI Xiaofei, LIU Zhuangzhuang, PENG Fangren. Effects of different pruning measures on the photosynthetic characteristics of pecan seedlings[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2017, 41(06): 13-18.

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Effects of different pruning measures on the photosynthetic characteristics of pecan seedlings

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