Effects of Citrus Huanglongbing on Tree Traits and Fruit Quality of Citrus maxima (Burm.) Merr. cv. Shatian Yu

doi:10.3969/j.issn.1000-2561.2020.09.018

Abstract

Abstract:

Citrus Huanglongbing (HLB) is a devastating disease that seriously affects the development of citrus industry. It not only leads to leaf yellowing and affects the fruits quality, but also affects the life cycle of citrus trees. In order to investigate the effects of HLB on Shatian pomelo [Citrus maxima (Burm.) Merr. cv. Shatian Yu], the effects of HLB on the leaf morphological characteristics and fruit appearance and internal quality as well as mineral elements of Shatian pomelo were systematically analyzed. The result could provide references for the control of citrus HLB. In this study, the HLB positive Shatian pomelo trees and fruits were used for the experimental group (HLB⁺) and the HLB negative Shatian pomelo trees and fruits were used as the control group (HLB^-). The leaf area, content of chlorophyll a, chlorophyll b and carotenoid of HLB⁺ leaf decreased by 28.13%, 40.38%, 44.00% and 40.47%, respectively. The color of the HLB⁺ fruits was abnormal and the fruits of HLB⁺ was smaller. The average fruit weight of HLB⁺ fruits decreased by 45.62%. The HLB⁺ fruits had thinner peels and its most seeds could not develop normally. The vitamin C content of HLB⁺ fruits was significantly higher than that of HLB^- fruits, increased by 26.44%. The content of mineral elements in different tissues changed obviously after infection with HLB. The content of N and Ca of the leaves decreased by 19.00% and 49.72%, respectively, and the content of N of the pulp decreased by 18.00%, but the content of Ca of HLB⁺ peel and pulp significantly increased compared to the HLB^- peel and pulp. And the content of S of the HLB⁺ trees was significantly lower than that of the healthy trees. The content of B and Cu of the HLB⁺ leaf decreased by 35.07% and 54.45%, respectively. The content of Cu of the HLB⁺peel decreased by 42.96% and the content of Zn of the HLB⁺pulp increased by 41.30%. HLB seriously affected the leaf morphology, fruit quality and mineral element metabolism of Shatian pomelo trees. So more attention should be paid to the prevention and control of HLB-infected Shatian pomelo.

Key words: Citrus Huanglongbing, Citrus maxima (Burm.) Merr. cv. Shatian Yu, color, quality, mineral elements

CLC Number:

S436.66

WANG Feiyan,ZHANG Ruimin,WU Wen,ZHU Congyi,HUANG Yongjing,CHEN Jiezhong,ZENG Jiwu. Effects of Citrus Huanglongbing on Tree Traits and Fruit Quality of Citrus maxima (Burm.) Merr. cv. Shatian Yu[J]. Chinese Journal of Tropical Crops, 2020, 41(9): 1847-1855.

Figures/Tables 11

References 31

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编号 Number	叶绿素a Chlorophyll a/(mg·g^-1)	叶绿素b Chlorophyll b/(mg·g^-1)	类胡萝卜素 Carotenoid/(mg·g^-1)	含水量 Water content/%	叶面积 Leaf area/cm²
HLB⁺	1.07±0.29^b	0.25±0.08^b	0.28±0.07^b	59.10±3.66^a	55.95±2.57^b
HLB^-	2.79±0.08^a	0.71±0.02^a	0.66±0.01^a	58.90±0.65^a	77.85±2.27^a

编号 Number	叶绿素a Chlorophyll a/(mg·g^-1)	叶绿素b Chlorophyll b/(mg·g^-1)	类胡萝卜素 Carotenoid/(mg·g^-1)	含水量 Water content/%	叶面积 Leaf area/cm²
HLB⁺	1.07±0.29^b	0.25±0.08^b	0.28±0.07^b	59.10±3.66^a	55.95±2.57^b
HLB^-	2.79±0.08^a	0.71±0.02^a	0.66±0.01^a	58.90±0.65^a	77.85±2.27^a

编号Number	L^*	a^*	b^*	C^*	h₀	a^/b^
HLB⁺	47.94±3.64^b	-9.49±1.58^a	23.11±0.68^b	37.72±5.86^a	104.73±2.64^a	-0.41±0.06^a
HLB^-	54.76±1.70^a	-8.18±0.62^a	25.64±0.79^a	45.20±0.85^a	103.15±1.22^a	-0.32±0.03^a

编号Number	L^*	a^*	b^*	C^*	h₀	a^/b^
HLB⁺	47.94±3.64^b	-9.49±1.58^a	23.11±0.68^b	37.72±5.86^a	104.73±2.64^a	-0.41±0.06^a
HLB^-	54.76±1.70^a	-8.18±0.62^a	25.64±0.79^a	45.20±0.85^a	103.15±1.22^a	-0.32±0.03^a

指标 Index	HLB^-						HLB⁺
指标 Index	L^*	a^*	b^*	C^*	h₀	a^/b^	L^*	a^*	b^*	C^*	h₀	a^/b^
L	1.00						1.00
a	1.00^**	1.00					-0.22	1.00
b	0.95	0.95	1.00				0.97	-0.45	1.00
C	0.70	0.70	0.89	1.00			0.95	-0.50	0.998^*	1.00
h₀	-1.00	-1.00	-0.92	-0.64	1.00		-0.62	-0.63	-0.41	-0.36	1.00
a/b	1.00^*	1.00^*	0.96	0.72	-1.00	1.00	0.69	0.56	0.49	0.44	-1.00	1.00