Comprehensive Evaluation for Salinity Tolerance of Flax Resources During Germination

doi:10.7525/j.issn.1673-5102.2019.06.019

Abstract

Abstract: It has important practical significance for flax to screen salt tolerant varieties to deal with salt stress in the sustainable development In this study, the seed of 28 flax resources were treated with 100 mmol·L^-1 NaCl and the germination rate, total fresh weight, hypocotyl fresh weight, hypocotyl dry weight, hypocotyl length, radicle fresh weight, radicle dry weight, radicle length were measured on the seventh day. Through correlation analysis, factor and principal components analysis, clustering analysis and stepwise regression analysis, the 11 indicators were comprehensively analyzed in order to comprehensively evaluate the salinity tolerance of 28 flax materials during germination, and screen out the key indicators for the salt-tolerance identification of flax materials during germination. The results showed that during the correlation analysis, there were extremely significant or significant and positive relationships among multiple indicators; the factor and principal components analysis turned 11 single indicators into 3 comprehensive indicators. The principal component Ⅰ mainly reflected the growth situation of hypocotyl; The principal component Ⅱ mainly reflected the growth situation of radicle; The principal component Ⅲ mainly reflected the germination situation of seed. The 28 flax materials were divided into 4 categories by clustering analysis:salt tolerant, medium salt tolerant, salt sensitive, and strongly salt sensitive. Among 28 flax materials, Yanza 10 and Lunxuan 1 were strongly salt tolerant; Longya 4、R40 and DYMS were salt tolerant. We built a mathematical evaluation model for predicting the salinity tolerance of flax resources during germination, then screened out 4 key indicators for salt-tolerance identification of flax resources during germination, including total fresh weight, radicle dry weight, germination index and hypocotyl length. The predictive values of 4 key indicators had a significantly correlation with the comprehensive Z values(R²=0.991 8^**), which showed that the results were high accuracy, so the 4 key indicators could evaluate the salinity tolerance of flax resources during germination by taking place of 11 indicators.

Key words: Flax, germination, salinity, comprehensive evaluation, indicators screening

CLC Number:

S563.2

ZHAO Wei, QI Yan-Ni, ZHANG Jian-Ping, ZHAO Li, WANG Li-Min, XIE Ya-Ping, WANG Bin, ZHANG Yan-Ping. Comprehensive Evaluation for Salinity Tolerance of Flax Resources During Germination[J]. Bulletin of Botanical Research, 2019, 39(6): 955-963.

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