不同板栗品种坚果果皮结构差异及其与腐烂指数的相关性分析

doi:10.11707/j.1001-7488.LYKX20230588

Abstract

Abstract:

Objective: This study aimed to elucidate the structural characteristics of the nut pericarp in different chestnut varieties and their relationship with the decay index, identifying key pericarp structural indicators that influence chestnut decay. This research provides a reference for the evaluation, selection, and scientific storage of chestnut germplasm resources resistant to decay. Method: Nuts from six chestnut cultivars planted in Qianxi County, Hebei Province (‘Libozaoli’, ‘Bayuehong’, ‘Mingjian’, ‘Taili 1’, ‘Yanshanzaofeng’, and ‘Dabanhong’) were used as experimental materials. A low-temperature storage experiment (0~2 ℃) was conducted over 180 days, with nut rot conditions surveyed every 30 days. Pericarp samples from both intact nuts before storage and rotted nuts during storage were fixed for structural observation using the paraffin section method. This facilitated analysis of pericarp structural and differences among different chestnut cultivars, changes in the structure of rotted nut pericarps, and the correlation with the decay index. Result: 1) Significant differences in the decay levels were observed among chestnut cultivars during storage. ‘Mingjian’, ‘Taili 1’, ‘Yanshanzaofeng’, and ‘Dabanhong’ showed higher storage resistance with an average rot index of 9.35%, whereas ‘Bayuehong’ and ‘Libozaoli’ were more prone to rot, with rot indexes reaching 23.53% and 21.63%, respectively. 2) Significant differences in pericarp structure were noted among the varieties. ‘Mingjian’, ‘Taili 1’, ‘Yanshanzaofeng’, and ‘Dabanhong’ had thick cuticle layers, small and regular epidermal cells, and highly dense mesocarp and endocarp layers. ‘Bayuehong’ and ‘Libozaoli’ had thin cuticle layers, larger epidermal cells, with ‘Bayuehong’ showing clear gaps in the epidermal cell layer, whereas ‘Libozaoli’, despite a tighter epidermal cell layer, had less dense mesocarp and endocarp layers. Compared to intact fruits, decayed fruits showed a significant reduction in cuticle thickness, increased gaps in the epidermal, mesocarp, and endocarp layers, and a significant decrease in pericarp density. Specifically, the cuticle layer of decayed fruits from ‘Libozaoli’ and ‘Bayuehong’ nearly vanished, with severe damage to the epidermal layer, and decomposition of the cell walls in the thin-walled cells of the mesocarp, leading to numerous cavities, whereas ‘Mingjian’, ‘Taili 1’, ‘Yanshanzaofeng’, and ‘Dabanhong’ maintained a certain thickness in the cuticle layer, and their epidermal cell structure remained relatively intact, but more cavities appeared in the middle and inner pericarp layers. 3) The analysis of the correlation between the pericarp structural indicators of intact and decayed fruits and the decay index showed that the decay index was significantly negatively correlated with the thickness of the cuticle layer, and significantly positively correlated with the gap rate of the epidermal cell layer and the gap rate of the mesocarp and endocarp layers. It was also negatively correlated with the length-to-width ratio of epidermal cells, but showed no significant correlation with other indicators. 4) Based on the four indicators of cuticle thickness, the length-width ratio of epidermal cells, and the cell gap size of the epidermal, mesocarp, and endocarp layers, the membership function method was used for comprehensive evaluation and found that the decay resistance of the six chestnut varieties was ranked from strong to weak as ‘Mingjian’ > ‘Taili 1’ > ‘Yanshanzaofeng’ > ‘Dabanhong’ > ‘Libozaoli’ > ‘Bayuehong’. The results were basically consistent with the storage test results. Conclusion: The thickness of the cuticle layer, the length-width ratio of epidermal cells, and the cell gap size of the epidermal, mesocarp, and endocarp layers are closely related to the occurrence of rot. The above four indicators can be used as an important reference for determining the decay resistance of chestnut.

Key words: chestnut, rot index, chetnut peel, anatomical structure, cuticle

CLC Number:

S664.2

Hairong Lai,Sujuan Guo. Differences in Peel Structure and Correlation Analysis with Decay Index of Different Chinese Chestnut (Castanea mollissima) Varieties[J]. Scientia Silvae Sinicae, 2024, 60(12): 72-82.

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编号 NO.	品种 Varieties	种源地 Source
1	‘荔波早栗’ ‘Libozaoli’	贵州荔波 Libo，Guizhou
2	‘八月红’ ‘Bayuehong’	湖北罗田 Luotian，Hubei
3	‘明拣’ ‘Mingjian’	陕西长安 Changan，Shanxi
4	‘泰栗1号’ ‘Taili 1’	山东泰安 Taian，Shandong
5	‘燕山早丰’ ‘Yanshanzaofeng’	河北迁西 Qianxi，Hebei
6	‘大板红’ ‘Dabanhong’	河北宽城 Kuancheng，Hebei

腐烂等级 Rot level	判别标准 Judgement standard
0	未发生腐坏 No decay occurred
1	10%≤DA<30%
2	30%≤DA<70%
3	70%≤DA

品种 Varieties	果实状态 State of fruit	角质层 Cuticle/μm	表皮层 Epidermal/μm	栅栏组织层 Palisade/μm	外果皮层 Exocarp/μm	中果皮层 Medocarp/μm	内果皮层 Endocarp/μm	果皮层 Total peel/μm
‘荔波早栗’ ‘Libozaoli’	完好果 Healthy fruit	1.35±0.05 C	13.55±1.57 A	110.35±4.23 C	123.90±5.80 CD	451.94±8.40 A	27.48±3.39 B	604.67±23.44 A
‘荔波早栗’ ‘Libozaoli’	腐烂果 Rotten fruit	0.33±0.14 D	7.14±0.22 B	100.32±8.79 C	107.79±3.87 C	328.32±9.07 B	5.73±2.35 C	441.84±7.45 C
‘八月红’ ‘Bayuehong’	完好果 Healthy fruit	0.86±0.11 D	10.52±1.12 B	187.44±7.46 A	197.96±8.58 A	254.36±14.70 D	46.06±11.58 A	499.24±34.97 B
‘八月红’ ‘Bayuehong’	腐烂果 Rotten fruit	0.37±0.26 D	9.43±2.31 A	200.25±6.03 A	210.05±3.78 A	318.89±24.20 B	9.86±2.98 B	538.80±13.68 B
‘明拣’ ‘Mingjian’	完好果 Healthy fruit	2.41±0.04 B	6.77±1.44 C	110.09±4.33 C	116.74±5.77 D	249.24±4.26 D	8.97±1.73 C	377.36±11.80 C
‘明拣’ ‘Mingjian’	腐烂果 Rotten fruit	2.34±0.29 A	6.60±0.48 C	131.89±9.20 B	140.83±5.34 B	430.71±4.25 A	8.88±1.75 B	580.42±7.37 A
‘泰栗1号’ ‘Taili 1’	完好果 Healthy fruit	3.09±0.06 A	7.79±0.48 C	123.30±5.88 B	131.09±6.36 BC	218.67±9.76 E	9.87±1.17 C	362.68±17.35 C
‘泰栗1号’ ‘Taili 1’	腐烂果 Rotten fruit	2.31±0.35 A	8.43±0.35 AB	130.39±6.23 B	141.13±4.17 B	306.84±12.84 B	9.53±0.67 B	457.50±7.76 C
‘燕山早丰’ ‘Yanshanzaofeng’	完好果 Healthy fruit	2.38±0.07 B	7.62±1.10 C	129.36±3.28 B	136.98±4.38 B	328.39±3.66 C	28.77±0.85 B	496.52±8.96 B
‘燕山早丰’ ‘Yanshanzaofeng’	腐烂果 Rotten fruit	1.93±0.32 B	7.82±0.72 B	132.48±1.04 B	142.23±0.95 B	297.05±4.62 B	11.50±0.28 A	450.78±4.21 C
‘大板红’ ‘Dabanhong’	完好果 Healthy fruit	1.58±0.06 C	4.43±0.90 D	103.11±3.04 C	107.54±3.94 E	381.06±9.80 B	9.38±1.78 B	499.56±15.58 B
‘大板红’ ‘Dabanhong’	腐烂果 Rotten fruit	1.24±0.12 C	5.15±0.53 D	121.43±2.02 B	127.82±1.12 B	299.26±7.16 B	9.03±1.48 B	436.11±6.15 C

品种 Varieties	果实状态 State of fruit	表皮细胞长度 Epidermal cell length/μm	表皮细胞厚度（宽度） Epidermal cell thickness(width)/μm	表皮细胞横截面积 Epidermal cell cross-sectional area/μm²	表皮细胞长宽比 Epidermal cell aspect ratio	表皮细胞层间隙率 Epidermal cell gap rate（%）	中、内果皮层间隙率 Mesocarp and endocarp gap rate（%）
‘荔波早栗’ ‘Libozaoli’	完好果 Healthy fruit	17.26±1.07 A	13.55±1.57 A	233.94±31.10 A	1.27±0.17 C	0.29±0.09 B	0.83±0.25 A
‘荔波早栗’ ‘Libozaoli’	腐烂果 Rotten fruit	14.45±1.34 A	7.14±0.22 C	103.17±9.45 C	2.02±0.21 B	25.33±2.27 B	20.26±0.85 B
‘八月红’ ‘Bayuehong’	完好果 Healthy fruit	13.56±1.87 B	10.52±1.12 B	144.06±25.64 B	1.29±0.21 C	0.67±0.16 A	0.61±0.22 B
‘八月红’ ‘Bayuehong’	腐烂果 Rotten fruit	10.84±2.43 B	9.43±2.31 A	102.22±18.76 C	1.15±0.41 D	36.36±3.24 A	35.10±1.14 A
‘明拣’ ‘Mingjian’	完好果 Healthy fruit	19.04±2.41 A	6.77±1.44 C	127.44±27.50 B	2.95±0.82 A	0.12±0.03 C	0.23±0.08 CD
‘明拣’ ‘Mingjian’	腐烂果 Rotten fruit	14.51±1.10 A	6.60±0.48 D	95.70±10.19 C	2.20±0.21 A	6.86±0.28 D	14.19±0.51 C
‘泰栗1号’ ‘Taili 1’	完好果 Healthy fruit	18.10±2.84 A	7.79±0.48 C	141.93±25.91 B	2.32±0.22 B	0.16±0.04 C	0.17±0.03 D
‘泰栗1号’ ‘Taili 1’	腐烂果 Rotten fruit	15.46±1.00 A	8.43±0.35 B	130.33±4.63 A	1.83±0.31 C	9.76±0.21 C	15.17±0.55 C
‘燕山早丰’ ‘Yanshanzaofeng’	完好果 Healthy fruit	19.60±3.66 A	7.62±1.10 C	151.27±20.82 B	2.57±0.31 AB	0.11±0.07 C	0.27±0.17 CD
‘燕山早丰’ ‘Yanshanzaofeng’	腐烂果 Rotten fruit	14.81±0.60 A	7.82±0.72 B	115.81±8.19 B	1.89±0.12 C	6.70±0.18 D	10.09±0.33 D
‘大板红’ ‘Dabanhong’	完好果 Healthy fruit	10.60±2.36 B	4.43±0.90 D	47.16±9.05 C	2.40±0.71 B	0.05±0.03 D	0.35±0.04 C
‘大板红’ ‘Dabanhong’	腐烂果 Rotten fruit	10.34±1.33 B	5.15±0.53 E	53.25±5.98 D	2.01±0.17 B	6.00±0.13 D	7.09±0.25 E

品种名称 Varieties	角质层厚度 Cuticle thickness	表皮细胞层间隙率 Epidermal cell gap rate	中、内果皮层间隙率 Mesocarp and endocarp gap rate	表皮细胞长宽比 Epidermal cell thickness Length/width ratio	综合得分值 Comprehensive score	排序 Rank
‘荔波早栗’ ‘Libozaoli’	0.22	0.61	0.00	0.00	0.19	5
‘八月红’ ‘Bayuehong’	0.00	0.00	0.33	0.01	0.09	6
‘明拣’ ‘Mingjian’	0.70	0.89	0.91	1.00	0.88	1
‘泰栗1号’ ‘Taili 1’	1.00	0.82	1.00	0.63	0.86	2
‘燕山早丰’ ‘Yanshanzaofeng’	0.68	0.90	0.85	0.77	0.80	3
‘大板红’ ‘Dabanhong’	0.32	1.00	0.73	0.67	0.68	4
权重 Weight	0.24	0.23	0.26	0.27

Differences in Peel Structure and Correlation Analysis with Decay Index of Different Chinese Chestnut (Castanea mollissima) Varieties

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