甘薯苗期耐盐性鉴定及其指标筛选

doi:10.3724/SP.J.1006.2018.01237

Abstract

Abstract:

Eighteen sweet potato varieties were selected as the test material. The control and treatment groups were established via saline soil cultivation in seedling stage. The treatment group received 200 mmol L ^-1 NaCl. Fourteen physical traits were observed in each treatment, which were fresh stem leaf weight, fresh root weight, dry stem leaf weight, dry root weight, relative leaf conductivity, F_v/F_m, SPAD value, superoxide dismutase (SOD) activity, malondialdehyde (MDA) content, proline content, root vigor, root Na ⁺ content, root K ⁺content, and Na ⁺/K ⁺ ratio. A comprehensive analysis of the salt tolerance of different varieties was conducted via correlation analysis, principal component analysis, clustering analysis, and stepwise regression of the salt tolerance efficiency of each index. Principal component analysis narrowed down the 14 single indexes in the salt-stressed seedling stage of sweet potatoes to five independent comprehensive indexes. Subordinate function analysis was conducted to obtain the comprehensive assessment value (D-value) of salt tolerance of different varieties in seedling stage. In clustering analysis, the 18 sweet potato varieties were divided into four salt tolerance types, including four salt-sensitive, three weak salt tolerant, seven moderate salt-tolerant, and four high salt-tolerant. On the basis of this division, stepwise regression method was used to establish a regression equation for salt tolerance assessment of sweet potatoes in seedling stage. Eight physiological indexes were selected (fresh stem leaf weight, fresh root weight, dry stem leaf weight, leaf SPAD value, SOD enzyme activity, MDA content, proline content, and Na ⁺/K ⁺ ratio) for the same assessment purpose. This paper presents the germplasm information for selection and breeding of new salt-tolerant sweet potato varieties. The results could serve as a basis for subsequent assessment of seedling stage salt tolerance of sweet potatoes and further studies on their salt tolerance mechanism.

Key words: sweet potato, seedling stage, salt tolerant, comprehensive assessment, identified index

Wen-Xue DUAN,Hai-Yan ZHANG,Bei-Tao XIE,Bao-Qing WANG,Li-Ming ZHANG. Identification of Salt Tolerance and Screening for Its Indicators in Sweet Potato Varieties during Seedling Stage[J].Acta Agronomica Sinica, 2018, 44(8): 1237-1247.

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References 41

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项目 Item		CI₁	CI₂	CI₃	CI₄	CI₅
特征根 Eigen value		8.6185	1.2008	1.1091	1.0367	0.5274
贡献率 Contribution ratio		61.5606	8.5772	7.9219	7.4050	3.7674
累计贡献率 Cumulative contribution ratio		61.5606	70.1377	78.0597	85.4647	89.2321
特征向量 Eigen vector	X₁	0.3147	0.0425	-0.1932	0.1368	0.1386
	X₂	0.3092	0.1377	0.1058	-0.0449	0.1869
	X₃	0.3095	0.0180	-0.1334	0.0591	-0.0586
	X₄	0.2819	0.0376	0.1084	-0.4418	0.0333
	X₅	0.2477	0.1128	-0.2463	-0.3718	0.6375
	X₆	0.2756	-0.2629	0.3830	-0.1045	-0.0300
	X₇	-0.2737	-0.1865	0.2135	-0.2465	0.4086
	X₈	0.1871	-0.5779	-0.1393	0.4066	0.2228
	X₉	0.2646	0.3335	0.2197	-0.1753	-0.3389
	X₁₀	-0.2837	0.1796	0.2257	0.0216	0.0700
	X₁₁	-0.3230	-0.0103	0.0359	0.0757	0.1798
	X₁₂	0.1844	-0.1598	0.7166	0.1962	0.1313
	X₁₃	-0.2591	0.2681	0.1778	-0.0038	0.2789
	X₁₄	0.1642	0.5347	0.0620	0.5744	0.2652

品种(系) Variety (line)	回归值 Regression value	原始值 Primary value	差值 Difference	估计精度 Evaluation accuracy (%)
08365	0.240	0.229	-0.011	95.35
09049	0.759	0.758	-0.001	99.90
09110	0.611	0.613	0.002	99.70
11025	0.295	0.282	-0.013	95.57
12092	0.203	0.207	0.003	98.37
12109	0.621	0.612	-0.009	98.59
12148	0.164	0.157	-0.007	95.65
12156	0.488	0.484	-0.003	99.29
12211	0.445	0.447	0.002	99.62
12231	0.577	0.571	-0.006	98.89
13055	0.664	0.668	0.004	99.45
紫罗兰 Ziluolan	0.396	0.379	-0.017	95.81
烟薯25 Yanshu 25	0.544	0.534	-0.010	98.19
济薯18 Jishu 18	0.518	0.526	0.008	98.50
济薯21 Jishu 21	0.764	0.769	0.005	99.36
济徐23 Jixu 23	0.804	0.778	-0.026	96.78
济薯25 Jishu 25	0.598	0.604	0.006	99.07
济薯26 Jishu 26	0.838	0.857	0.019	97.81

Identification of Salt Tolerance and Screening for Its Indicators in Sweet Potato Varieties during Seedling Stage

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