Abstract
Recent studies have shown that nitric oxide (NO) may be involved in diverse plant developmental processes as an important signal molecule. However, the effects of NO on vegetative and reproductive growth of intact plants are not fully understood. In our study, the NO donor sodium nitroprusside (SNP) at 3,000, 6,000 and 9,000 μM was used to characterize the roles of NO in vegetative and reproductive growth of “Siberia” lily. The results showed that the effects of NO on growth in “Siberia” lily were dose-dependent. Compared with the control (distilled water treatment), 3,000 μM SNP caused a significant increase in plant height and internode length. Significant differences were recorded in flowering period, lifetime of individual flowers, number of flowers per plant, flower diameter, and bud length with 6,000 μM SNP. However, 9,000 μM SNP resulted in negative effects on these parameters as compared to the control. Moreover, 3,000 μM SNP caused a significant increase in the contents of leaf chlorophyll, water soluble carbohydrate (WSC), starch, total carbohydrate, total soluble protein, and total nitrogen, all of which were decreased by high levels of SNP (9,000 μM). Together, these results indicated that NO treatments at the proper dosage can promote vegetative and reproductive growth, possibly by improving the levels of leaf chlorophyll, WSC, starch, total carbohydrate, total soluble protein and total nitrogen.
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