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

HAN Jie, ZHANG Ming, LIN Subao, SHANG Jing, LI Xiaofei, LIU Zhuangzhuang, PENG Fangren

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (06) : 13-18.

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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) : 13-18. DOI: 10.3969/j.issn.1000-2006.201703024

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 Fangren1*
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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(AQY), light compensation(LCP), net photosynthetic rate(Pn), light saturation point(LSP)and dark respiration rate(Rd))were different among treatments. Net photosynthetic rate(Pn), transpiration rate(Tr)and stomatal conductance(Gs)under the three treatments showed similar trends. The average size was T3 > T1 > T2, and the diurnal difference in intercellular CO2 concentration was opposite(T2 > T1 > T3). The maximum net photosynthetic rate(Pn,max)and AQY of different treatments were the highest, while the LCP was significantly lower, in T3 compared to the other treatments. Additionally, LSP and Rd 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.

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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 https://doi.org/10.3969/j.issn.1000-2006.201703024

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