芝麻抗裂蒴性鉴定方法研究及核心种质抗裂蒴性评价

doi:10.3864/j.issn.0578-1752.2019.20.003

Abstract

Abstract:

【Objective】 The mature sesame capsules are prone to dehisce, which causes yield loss, and it is an important factor influencing mechanized harvesting. Establishment of an easy, accurate, reliable and reproducible method for identification sesame capsule dehiscence (CD) resistance, will be helpful to discover germplasm with CD resistance and breed varieties resistant to CD, consequently promote the mechanization process of sesame production. 【Method】 After 2 weeks of the sesame enters mature stage, the capsules in the middle capsules part of the main stem were used in the identification CD resistance. Five representative germplasms with different CD resistance were used, the sample treatment method was determined by comparing the capsule opening width (COW) and the dehiscence angle C1 before and after drying, the best sampling part was selected by comparing the COW and the dehiscence angle C1 at each node of main stem. Using 308 core collections, total of 10 indices were measured and calculated, such as the capsule length (CL), capsule width (CW), capsule thickness (CT), capsule opening width (COW), capsule dehiscence depth (CDD), peel weight (PW), CDD/CL, PW/CL, dehiscence angle C1 and C2. Through statistical analysis including correlation analysis, principal component analysis, membership functions, and linear regression, the optimal index to evaluating CD resistance was screened out. The classification standard of CD resistance was determined according to the COW variation distribution on sesame core collections with diverse CD resistance. 【Result】 The capsule drying treatment was helpful to eliminate the error, and improve the identification accuracy. There was no significant difference between different plants of each material in the COW and dehiscence angle C1 of capsule from the middle 5 nodes, which were the best sampling parts. Based on statistical analysis of the 308 core collections, the optimal regression equation was established on the D value and individual indexes, that was D=-0.12+0.33X₂+ 3.21X₁₀, which showed that COW and PL/CL had significant effects on CD resistance, as the COW was highly significantly positive correlated with the dehiscence angle C1 (the correlation coefficient reached 0.8049), therefore the COW could be used in the identification of the CD resistance. The following classification criteria of sesame CD resistance were determined: Highly Resistant (COW≤0.7 cm), Resistant (0.7 cm＜COW≤0.9 cm), Intermediate (0.9 cm＜COW≤1.1 cm), Dehiscent (1.1 cm＜COW≤1.5 cm), Prone to dehiscence (COW＞1.5 cm). 【Conclusion】 When the sesame entered mature stage for 2 weeks or later, the middle capsules from 5 nodes in the middle part of the main stem was sampled and dried, then the COW were measured to accurately evaluate the CD resistance of sesame. The method established in this study was simple, with strong controllability and good repeatability, it was unaffected by environment, the result was reliable and can accurately reflect the CD resistance, therefore, the method can be used for high throughput identification of CD resistance of sesame germplasm. The CD resistance of 308 core collections were evaluated by this method, 11 germplasms with high CD resistance were identified.

Key words: Sesamum indicum L, capsule dehiscence resistance, identification method, capsule opening width, core collection

LiSong SHI,Yuan GAO,DongHua LI,WenJuan YANG,Rong ZHOU,XiuRong ZHANG,YanXin ZHANG. Study on the Method for Identification Sesame Capsule Dehiscence Resistance and Evaluation of Capsule Dehiscence Resistance of the Core Collection[J].Scientia Agricultura Sinica, 2019, 52(20): 3520-3532.

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References 39

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取样部位Sampling position	单株Single plant	LS78	LS83	LS85	LS89	LS90
全部节位平均值 Average value of all nodes	1	0.793b	0.985b	1.198a	1.860a	1.827a
	2	0.905a	1.158a	0.944b	1.681a	1.859a
	3	0.848ab	0.990b	0.941b	1.686a	1.895a
	4	0.873ab	1.028b	0.960b	1.865a	1.946a
中部5节位平均值 Average value of the middle 5 nodes	1	0.898a	1.113a	1.127a	1.875a	1.897a
	2	0.887a	1.171a	1.084a	1.748a	1.953a
	3	0.883a	1.098a	1.136a	1.925a	1.813a
	4	0.832a	1.059a	1.070a	1.751a	2.065a
去除基部5节和顶部5节后其他节位平均值 Average value of the other nodes after removing the base 5 nodes and the top 5 nodes	1	0.886a	1.070a	1.193a	1.886a	1.929a
	2	0.929a	1.164a	1.043b	1.730a	1.977a
	3	0.910a	0.995a	1.024b	1.744a	1.968a
	4	0.889a	1.095a	1.012b	1.845a	1.942a

取样部位Sampling position	单株Single plant	LS78	LS83	LS85	LS89	LS90
全部节位平均值 Average value of all nodes	1	18.359b	18.876b	24.569a	31.512a	30.521b
	2	21.766a	23.300a	19.403b	30.737a	31.779ab
	3	21.045a	18.702b	19.030b	30.387a	33.235ab
	4	21.935a	20.739b	18.555b	32.998a	35.056a
中部5节位平均值 Average value of the middle 5 nodes	1	20.413a	20.889a	22.995a	31.163a	32.538a
	2	20.703a	23.216a	21.873a	30.555a	32.246a
	3	21.866a	21.039a	22.098a	32.814a	31.869a
	4	20.739a	20.779a	20.366a	29.832a	35.052a
去除基部5节和顶部5节后其他节位平均值 Average value of the other nodes after removing the base 5 nodes and the top 5 nodes	1	20.382b	20.139ab	24.577a	31.557a	31.528b
	2	21.715ab	22.865a	21.507b	31.906a	33.556b
	3	22.519a	18.941b	20.516b	31.259a	34.291ab
	4	22.227a	21.184ab	19.382b	31.810a	34.882a

材料 Material	抗裂蒴性 Capsule dehiscence resistance	裂口宽 Capsule opening width	C1
LS78	抗Resistance	0.875d	20.930d
LS83	裂Dehiscence	1.110c	21.480c
LS85	裂Dehiscence	1.104c	21.833c
LS89	易裂Prone to dehiscence	1.825b	31.091b
LS90	易裂Prone to dehiscence	1.932a	32.926a

指标 Index	蒴果长 CL	裂口宽 COW	裂口深 CDD	蒴果宽 CW	蒴果厚 CT	果皮重 PW	C1	C2	裂口深/蒴果长 CDD/CL	果皮重/蒴果长 PW/CL	D值 D value
蒴果长CL	1.0000
裂口宽COW	0.5062	1.0000
裂口深CDD	0.6554	0.5770	1.0000
蒴果宽CW	0.4282	0.3949	0.2994	1.0000
蒴果厚CT	0.4368	0.2164	0.2965	0.5118	1.0000
果皮重PW	0.7243	0.4019	0.4767	0.7101	0.6662	1.0000
C1	-0.0427	0.8049	0.2332	0.1597	-0.0551	-0.0137	1.0000
C2	-0.1942	0.4027	-0.4335	0.0982	-0.0907	-0.1020	0.6119	1.0000
裂口深/蒴果长 CDD/CL	0.2019	0.4072	0.8486	0.1156	0.0858	0.1585	0.3336	-0.4530	1.0000
果皮重/蒴果长 PW/CL	0.3987	0.2310	0.2576	0.7128	0.6484	0.8948	-0.0108	-0.0427	0.0945	1.0000
D值 D value	0.5232	0.8394	0.4445	0.7049	0.5221	0.6940	0.6155	0.4104	0.2376	0.6271	1.0000

指标 Index	蒴果长 CL	裂口宽 COW	裂口深 CDD	蒴果宽 CW	蒴果厚 CT	果皮重 PW	C1	C2	裂口深/蒴果长 CDD/CL	果皮重/蒴果长 PW/CL	贡献率 C
CI(1)	0.3909	0.3222	0.3866	0.3643	0.3335	0.4299	0.1271	-0.0622	0.2341	0.3005	0.4165
CI(2)	-0.0480	0.4889	0.0606	-0.0940	-0.1679	-0.1967	0.6244	0.4753	0.1232	-0.2197	0.2232
CI(3)	-0.0412	0.0052	-0.4347	0.2610	0.2343	0.1840	0.0352	0.4936	-0.5658	0.2958	0.1891
CI(4)	-0.6695	-0.1791	-0.0770	0.1940	0.0638	-0.0460	0.2664	-0.0690	0.4115	0.4743	0.0743

Study on the Method for Identification Sesame Capsule Dehiscence Resistance and Evaluation of Capsule Dehiscence Resistance of the Core Collection

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