Effects of dustfall on photosynthetic characteristics and chlorophyll fluorescence characteristics of major fruit trees in Aksu Region, China

doi:10.3969/j.issn.1004-1524.2022.12.09

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (12): 2659-2668.DOI: 10.3969/j.issn.1004-1524.2022.12.09

• Horticultural Science • Previous Articles Next Articles

Effects of dustfall on photosynthetic characteristics and chlorophyll fluorescence characteristics of major fruit trees in Aksu Region, China

SUN Shouxia(), CHEN Hong(), LYU Wei, PIAO Hanqi, ZHOU Guanghui, WANG Hesong, ZHANG Shubin, HAO Jinlian

Key Laboratory of Forestry Ecology and Industrial Technology in Arid Areas of Xinjiang Education Department/Institute of Forestry and Landscape Architecture, Xinjiang Agricultural University, Urumqi 830052, China

Received:2021-07-06 Online:2022-12-25 Published:2022-12-26
Contact: CHEN Hong

Abstract

Abstract:

In order to explore the effect of long-term foliar dusts on photosynthetic performance of leaves in main fruit trees of Aksu area, Malus pumila, Juglans regia and Ziziphus jujube were used as experimental materials from June to August, five sample trees affected by dustfall in natural state were selected as dustfall treatment, and five sample trees whose leaves were washed with clear water every seven days were used as control treatments, respectively. The changes in dust absorption amount, photosynthetic parameters, fluorescence parameters and chlorophyll content in leaves were compared and analyzed. The results showed that the dust absorption ability of leaves in three fruit trees was as follows: Malus pumila>Ziziphus jujube>Juglans regia. The chlorophyll content (Chl), net photosynthetic rate (P_n), stomatal conductance (G_s) and transpiration rate (T_r) in three kinds of fruit trees treated with dustfall were significantly (P<0.05) lower than those in the control plants, while the intercellular CO₂ concentration (C_i) was significantly (P<0.05) higher than that in the control plants. The longer the dust absorption time was, the greater the influence on Chl and photosynthetic parameters of fruit trees was. In addition, the maximal photochemical efficiency (F_v/F_m) and photochemical quenching coefficient (qP) in three kinds of fruit trees treated with dustfall were significantly (P<0.05) lower than those in the control plants, while the minimal initial fluorescence (F_o) and non-photochemical quenching coefficient (NPQ) were significantly (P<0.05) higher than those in the control plants. Correlation analysis showed that there was a significant negative correlation between dust absorption and P_n, Chl and F_v/F_m in leaves of three kinds of fruit trees at P<0.05 and P<0.01 level, respectively. The main factor limiting P_n in leaves of three kinds of fruit trees under dustfall treatment was non-stomatal factor. Dustfall caused some damage or reversible inactivation of PSⅡ reaction center in fruit tree leaves, which reduced the original light energy conversion efficiency of fruit tree leaves, thus affecting the normal photosynthesis. The research results can provide a scientific theoretical basis for the cultivation and management of main fruit trees in Aksu area.

Key words: dustfall, Malus pumila, Juglans regia, Ziziphus jujube, photosynthetic parameter, chlorophyll fluorescence parameter, chlorophyll

CLC Number:

S66-33

SUN Shouxia, CHEN Hong, LYU Wei, PIAO Hanqi, ZHOU Guanghui, WANG Hesong, ZHANG Shubin, HAO Jinlian. Effects of dustfall on photosynthetic characteristics and chlorophyll fluorescence characteristics of major fruit trees in Aksu Region, China[J]. Acta Agriculturae Zhejiangensis, 2022, 34(12): 2659-2668.

Figures/Tables 7

Table 1 Dustfall amount of three fruit trees leaves mg·cm-2

树种 Tree	单位叶面积滞尘量 Amount of dust retention
树种 Tree	6月June	7月July	8月August	平均值Mean
苹果 Malus pumila	7.24±0.10 a	9.51±0.12 a	9.59±0.31 a	8.78±0.77 a
核桃 Juglans regia	5.94±0.27 b	8.13±0.16 c	8.19±0.25 b	7.42±0.74 c
枣 Ziziphus jujube	6.19±0.01 b	8.71±0.12 b	9.12±0.22 ab	8.01±0.91 b

Fig.1 Effect of dustfall on chlorophyll content in leaves of three fruit trees Different capital letters indicated that different tree species under the same treatment had significant (P<0.05) differences. Different lowercase letters indicated significant (P<0.05) difference between the two treatments in the same period. In the figure, ck(A) was the control treatment of apple, da(A) was the dustfall treatment of apple, ck(W) was the control treatment of walnut, da(W) was the dustfall treatment of walnut, ck(J) was the control treatment of jujube, da(J) was the dustfall treatment of jujube. The same as below.

Fig.2 Effects of dustfall on leaf Pn and Ci of three fruit trees

Fig.3 Effects of dustfall on leaf Gs and Tr of three fruit trees

Fig.4 Effects of dustfall on leaf Fv/Fm and Fo of three fruit trees

Fig.5 Effects of dustfall on leaf qP and NPQ of three fruit trees

Fig.6 Correlation analysis of stagnation and photosynthetic parameters and chlorophyll fluorescence parameters of three fruit trees from June to August * indicated significant difference at 0.05 level,** indicated significant difference at 0.01 level.

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Effects of dustfall on photosynthetic characteristics and chlorophyll fluorescence characteristics of major fruit trees in Aksu Region, China

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