Lily(Lilium spp.) is an important ornamental flower, which is mainly propagated by bulbs. Cell wall invertases(CWINs), which catalyze the irreversibly conversion of sucrose into glucose and fructose in the extracellul...Lily(Lilium spp.) is an important ornamental flower, which is mainly propagated by bulbs. Cell wall invertases(CWINs), which catalyze the irreversibly conversion of sucrose into glucose and fructose in the extracellular space, are key enzymes participating in sucrose allocation in higher plants. Previous studies have shown that CWINs play an essential role in bulblet initiation process in bulbous crops, but the underlying molecular mechanism remains unclear. Here, a CWIN gene of Lilium brownii var. giganteum(Lbg) was identified and amplified from genomic DNA. Quantitative RT-PCR assays revealed that the expression level of LbgCWIN1 was highly upregulated exactly when the endogenous starch degraded in non-sucrose medium during in vitro bulblet initiation in Lbg. Phylogenetic relationship, motif, and domain analysis of LbgCWIN1 protein and CWINs in other plant species showed that all sequences of these CWIN proteins were highly conserved. The promoter sequence of LbgCWIN1 possessed a number of alpha-amylase-, phytohormone-, light-and stress-responsive cis-elements. Meanwhile, β-glucuronidase(GUS) assay showed that the 459 bp upstream fragment from the translational start site displayed maximal promoter activity. These results revealed that LbgCWIN1 might function in the process of in vitro bulblet initiation and be in the response to degradation of endogenous starch.展开更多
Microscopical examination demonstrated that Tricholoma giganteum basidia bear 4 basidiospores. Mating tests revealed that T. giganteum has a tetra-polar, heterothallic mating system. New types of factor B (Br) occurre...Microscopical examination demonstrated that Tricholoma giganteum basidia bear 4 basidiospores. Mating tests revealed that T. giganteum has a tetra-polar, heterothallic mating system. New types of factor B (Br) occurred as a result of recombination within the B-type mating factor.展开更多
In order to achieve the transformation from the conventional soil-covering cultivation of Tricholoma giganteum with bags to the soilless cultivation with bottles and understand the mechanism of primordium formation of...In order to achieve the transformation from the conventional soil-covering cultivation of Tricholoma giganteum with bags to the soilless cultivation with bottles and understand the mechanism of primordium formation of Tricholoma giganteum,with Tricholoma giganteum mycelia as experimental materials,this paper studied the effect of different fruiting treatments on the activity of three enzymes in different time.The results showed that from the mycelial recovery to primardial formation and budding under three treatment groups which could form primordium,the tyrosinase activity was relatively stable,and under two treatment groups which could not form primordium,the tyrosinase activity dropped after the rise and reached a maximum on the 9 th day,significantly higher than under the other three groups,indicating that too high tyrosinase inhibited primardial formation; the prolease and amylase activity was effectively activated before primardial formation,and the enzymic activity was significantly higher than under the two treatment groups which could not form primordium.展开更多
Tricholoma giganteum also being called Tricholoma lobayense, belongs to Basidiomycotina, Hymenomycetes, Agaricales, Tricholomataceae and Tricholoma. It has high economic and medicinal values and is a kind of rare edib...Tricholoma giganteum also being called Tricholoma lobayense, belongs to Basidiomycotina, Hymenomycetes, Agaricales, Tricholomataceae and Tricholoma. It has high economic and medicinal values and is a kind of rare edible mushroom. Modern pharmacological studies have shown that T. giganteum have antitumor, antioxidant, antimicrobial and free radicals scavenging activity, and it can inhibit high blood pressure and HIV-1 reverse transcriptase. In this study, the technologies of isolation and purification of polysaccharides of T. giganteum were systematically studied. T. giganteum polysaccharides were obtained by hot-water extraction method. The infection of the extraction temperature, the extraction time, the solvent-solid ratio and the volume of solvent used during precipitation on the polysaccharides extraction ratio were studied. The extraction process was optimized by the uniform design (UD) method on the basis of the results of the single-factor experiments. The optimum extraction conditions of the mushroom polysaccharides (MP) were as follows: Extraction temperature was 100℃;extraction time was 3 hours;solvent-solid ratio was 20:1 and 5 times volume of 95% ethanol. The yield of polysaccharides of T. giganteum was 12.92%.展开更多
基金financially supported by the National Natural Science Foundation of China (Grant Nos.32101571,32002071)the Zhejiang Science and Technology Major Program on Agricultural New Variety Breeding (Grant No.2021C02071-6)。
文摘Lily(Lilium spp.) is an important ornamental flower, which is mainly propagated by bulbs. Cell wall invertases(CWINs), which catalyze the irreversibly conversion of sucrose into glucose and fructose in the extracellular space, are key enzymes participating in sucrose allocation in higher plants. Previous studies have shown that CWINs play an essential role in bulblet initiation process in bulbous crops, but the underlying molecular mechanism remains unclear. Here, a CWIN gene of Lilium brownii var. giganteum(Lbg) was identified and amplified from genomic DNA. Quantitative RT-PCR assays revealed that the expression level of LbgCWIN1 was highly upregulated exactly when the endogenous starch degraded in non-sucrose medium during in vitro bulblet initiation in Lbg. Phylogenetic relationship, motif, and domain analysis of LbgCWIN1 protein and CWINs in other plant species showed that all sequences of these CWIN proteins were highly conserved. The promoter sequence of LbgCWIN1 possessed a number of alpha-amylase-, phytohormone-, light-and stress-responsive cis-elements. Meanwhile, β-glucuronidase(GUS) assay showed that the 459 bp upstream fragment from the translational start site displayed maximal promoter activity. These results revealed that LbgCWIN1 might function in the process of in vitro bulblet initiation and be in the response to degradation of endogenous starch.
基金Sponsored by the Foundation of Fujian Province (No .2006S1001and No .2005N034)
文摘Microscopical examination demonstrated that Tricholoma giganteum basidia bear 4 basidiospores. Mating tests revealed that T. giganteum has a tetra-polar, heterothallic mating system. New types of factor B (Br) occurred as a result of recombination within the B-type mating factor.
文摘In order to achieve the transformation from the conventional soil-covering cultivation of Tricholoma giganteum with bags to the soilless cultivation with bottles and understand the mechanism of primordium formation of Tricholoma giganteum,with Tricholoma giganteum mycelia as experimental materials,this paper studied the effect of different fruiting treatments on the activity of three enzymes in different time.The results showed that from the mycelial recovery to primardial formation and budding under three treatment groups which could form primordium,the tyrosinase activity was relatively stable,and under two treatment groups which could not form primordium,the tyrosinase activity dropped after the rise and reached a maximum on the 9 th day,significantly higher than under the other three groups,indicating that too high tyrosinase inhibited primardial formation; the prolease and amylase activity was effectively activated before primardial formation,and the enzymic activity was significantly higher than under the two treatment groups which could not form primordium.
文摘Tricholoma giganteum also being called Tricholoma lobayense, belongs to Basidiomycotina, Hymenomycetes, Agaricales, Tricholomataceae and Tricholoma. It has high economic and medicinal values and is a kind of rare edible mushroom. Modern pharmacological studies have shown that T. giganteum have antitumor, antioxidant, antimicrobial and free radicals scavenging activity, and it can inhibit high blood pressure and HIV-1 reverse transcriptase. In this study, the technologies of isolation and purification of polysaccharides of T. giganteum were systematically studied. T. giganteum polysaccharides were obtained by hot-water extraction method. The infection of the extraction temperature, the extraction time, the solvent-solid ratio and the volume of solvent used during precipitation on the polysaccharides extraction ratio were studied. The extraction process was optimized by the uniform design (UD) method on the basis of the results of the single-factor experiments. The optimum extraction conditions of the mushroom polysaccharides (MP) were as follows: Extraction temperature was 100℃;extraction time was 3 hours;solvent-solid ratio was 20:1 and 5 times volume of 95% ethanol. The yield of polysaccharides of T. giganteum was 12.92%.
