
Effects of combined saline-alkali stress on physiological and biochemical characteristics of OT hybrid lily
YANG Yuhua, JIAN Jingjing, QIU Xiaodie, WANG Guijiao, ZONG Jianwei
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (4) : 117-126.
Effects of combined saline-alkali stress on physiological and biochemical characteristics of OT hybrid lily
【Objective】 In this study, we aimed to investigate the physiological response of lily (Lilium) to combined saline-alkali stress in the seedling growth stage. 【Method】 The bulbs of Lilium ‘Red Palace’ were treated with single salt (NaCl), neutral mixed salt [m(NaCl):m(Na2SO4)=1:2], and alkali mixed salt [m(NaCl):m(Na2SO4):m(Na2CO3):m(NaHCO3) = 5:23:9:3)]to study the morphological indicators, biomass, root-to-shoot ratios, relative conductivity, malondialdehyde content, soluble protein, root vigor, relative water content and Na+ and K+ contents in lily leaves and rhizomes. 【Result】 (1)Compared with CK, the underground and total biomass and the root-shoot ratio of lily decreased under the three saline-alkali treatments. The above-ground biomass and morphology indexes increased initially and then decreased. (2) Malondial dehyde(MDA) content and relative conductivity were enhanced by saline-alkali. Moreover, root activity and soluble protein content increased in a low-salt environment, but decreased when the saline-alkali concentration exceeded a certain value. (3) Although the K+/Na+ ratios in the aboveground and underground seedlings decreased after all treatments, the ratio was lower for the alkaline mixed salt treatment than for the neutral mixed salt or single salt treatment. (4) The Two-way analysis of variances showed that the salt concentration had a greater effect on various indexes than salt combination; salt concentration and combination and their interaction effects had significant effects on the bulb diameter, total fresh and dry weight, root-shoot ratios, root activity and relative water content. 【Conclusion】 The results indicated that the three saline-alkali treatments groups on lily decreased in the following order: alkali mixed salt> neutral mixed salt > single salt. These results can provide a theoretical basis for the selection of suitable soil for lily cultivation.
saline-alkali stress / OT hybrid lily / Lilium ‘Red Palace’ / morphology index / relative conductivity / root activity
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