Abstract
As an important gaseous regulator, hydrogen sulfide (H2S) is involved in various aspects of plant processes, including seed germination, stomatal movement, and postharvest senescence. The preservation capacity of Lanzhou lily (Lilium davidii var. unicolor Salisb) scales fumigated with or without exogenously applied sodium hydrosulfide (NaHS, a H2S donor) was investigated in the current study. Results indicate that NaHS fumigation was able to extend storage life and elicit endogenous H2S production of postharvest Lanzhou lily scales with an optimal concentration at 0.8 mM. Moreover, exogenously applied NaHS (0.8 mM) led to higher soluble sugar, soluble protein, and ascorbic acid levels and lower total phenolic and flavonoid contents compared with those of the control. The application of 0.8 mM NaHS also reduced the lipid peroxidation level and reactive oxygen species (ROS) accumulation in scales, as indicated by the lower malondialdehyde (MDA) content, relative conductivity, lipoxygenase (LOX) activity, O2− production rate, and hydrogen per-oxide (H2O2) content. Further, scales treated with 0.8 mM NaHS exhibited significantly higher activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and ascorbic acid peroxidase (APX). Collectively, our data provide new insight into how the postharvest senescence of Lanzhou lily scales might be alleviated by H2S by enhancing antioxidant defense systems.
Highlights
IntroductionUnicolor Salisb), a variant of L. davidii Duchartre, belongs to the genus Lilium of the family Liliaceae and is generally known as “the only sweet lily”
The endogenous H2S in the NaHS-treated scales was extremely signifi cantly higher than that in the control scales during the first 9 days of storage. These results suggest that H2S fumigation elicited endogenous H2S production, whic may be involved in the senescence of Lanzhou lily scales
The results presented here demonstrate that exogenous hydrogen sulfide (H2 S) fumigation prolonged the postharvest shelf-life of Lanzhou lily scales (Figure 1)
Summary
Unicolor Salisb), a variant of L. davidii Duchartre, belongs to the genus Lilium of the family Liliaceae and is generally known as “the only sweet lily”. It is mainly planted in the central area of Gansu Province in Northwest China [1]. Low-temperature storage combined with preservatives constitutes the universal strategy in terms of postharvest techniques of Lanzhou lily. Low temperature triggers oxidative damage that may result in nutrient changes in Lanzhou lily [7]. There is a need to develop suitable techniques to reduce nutrient loss and extend shelf-life
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