Effects of ethephon on the growth and photosynthetic characteristics of Dalbergia odorifera

doi:10.3969/j.issn.1000-2006.201809020

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (1): 18-24.doi: 10.3969/j.issn.1000-2006.201809020

Special Issue: 红木类珍贵树种专题

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Effects of ethephon on the growth and photosynthetic characteristics of Dalbergia odorifera

WANG Yuelin¹^,²(), XU Daping¹^,^*(), YANG Zengjiang¹, LIU Xiaojin¹, HONG Zhou¹, ZHANG Ningnan¹, CHEN Wende²

1. Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520, China
2. Tourism and Urban-Rural Planning College, Chengdu University of Technology, Chengdu 610059, China

Received:2018-09-18 Revised:2019-05-19 Online:2020-02-08 Published:2020-02-02
Contact: XU Daping E-mail:wangyuelin001@163.com;gzfsrd@163.com

Abstract

Abstract:

【Objective】 In this study, we documented the growth as well as photosynthetic and physiological characteristics of Dalbergia odorifera after injecting various concentrations of ethephon (ETH) with the aim of collecting data to provide a theoretical basis for efficient cultivation and later heartwood formation. 【Method】 Dalbergia odorifera with a DBH of 6-8 cm was taken as the research object and divided into 4 treatments groups, E0.1%, E0.5%, E2.5% and control group (CK). The effect of different treatments on the growth indicators ofD. odorifera, namely, growth indicator increment, SPAD value, specific leaf area (SLA), water use efficiency (WUE) and photosynthetic parameters was studied. 【Result】 Among the 3 ethephon treatments, the DBH increase (ΔD) with E0.1% and E0.5% treatments was larger than that of CK by 8.97% and 6.07%, respectively. Both the increase in tree height (ΔH) and the volume of the individual tree (ΔV) with E2.5% treatment were lower compared to CK with a decrease of 67.39% and 59.33%, respectively. Ethephon had a significant effect on the SPAD value of D. odorifera, and the order was E0.1%> E0.5%> CK> E2.5%. The leaf dry weight and leaf area were significantly higher at E0.1% and E0.5% compared to E2.5%. The order of SLA was E0.1%>E0.5%>CK>E2.5%. According to the Pearson correlation analysis, all ETH treatments had a significant negative effect on both SLA and WUE. The photosynthetic parameters obtained from the light response curve showed that the maximum net photosynthetic rate (P_{n, max}), initially increased, and then decreased with increasing concentration of ETH. The rate for E0.1% and E0.5% was higher than that for CK by 38.00% and 26.22%, respectively. The light saturation point (P_Lsp), initially increased, and then slightly decreased with increasing concentration of ETH injected. The values for all the treatments were higher than that for CK while those it was the highest for E0.5%. The light compensation points (P_Lcp) for all ETH-treated groups were lower than that for CK, and those for E0.1% and E0.5% were significantly lower than that for CK by 16.37% and 20.92%. 【Conclusion】 Low concentration of ETH could facilitate the chlorophyll content ofD. odorifera, SLA, P_n and other photosynthetic characteristics; at a high concentration of 2.5%, ETH was counterproductive to the height and individual tree volume increase of D. odorifera.

Key words: Dalbergia odorifera, ethephon (ETH), growth, photosynthetic characteristics, heartwood

CLC Number:

S713.8

WANG Yuelin, XU Daping, YANG Zengjiang, LIU Xiaojin, HONG Zhou, ZHANG Ningnan, CHEN Wende. Effects of ethephon on the growth and photosynthetic characteristics of Dalbergia odorifera[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2020, 44(1): 18-24.

Figures/Tables 5

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处理 treatment	斜率 slope (α)	P_n,max/ (μmol·m^-2·s^-1)	P_Lsp / (μmol·m^-2·s^-1)	P_Lcp / (μmol·m^-2·s^-1)	R_d / (μmol·m^-2·s^-1)	决定系数 determination coefficient (R²)
E0.1%	0.062±0.003 a	15.28±0.11 a	2 031.48±148.44 ab	56.91±1.85 b	3.083±0.08 a	0.999
E0.5%	0.059±0.003 a	13.98±0.19 b	2 209.65±716.28 ab	53.81±1.72 b	2.763±0.05 b	0.999
E2.5%	0.055±0.007 a	11.47±0.21 c	2 168.88±274.62 a	64.85±3.86 a	2.982±0.42 ab	0.997
CK	0.058±0.007 a	11.07±0.2 c	1 786.27±51.42 b	68.05±0.89 a	3.279±0.3 a	0.996

Effects of ethephon on the growth and photosynthetic characteristics of Dalbergia odorifera

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