Khoai mo, local name of Yam species belonging to the Dioscoraceae family, is widely grown at Muong Khuong, Lao Cai province because of their important food and pharmaticeutical valuables. This work aimed to sequence the MatK gene obtained from leaves of a local yam grown in Muong Khuong, Lao Cai. The sequencing result showed a partial sequence of the MatK gene which was submitted to GenBank with accession MF494702 provided. The length of this partial sequence is 916 nucleotides. Phylogeny analysis indicated that local yam cultivar grown at Muong Khuong, Lao Cai belonged to Dioscorea alata species. Nodal segments collected from this local yam were used as initial material for in vitro vegetative multiplication. In the shoot formation step, BAP or BAP and NAA complex were used in shoot formation experience. In vitro shooting effect was higher on MS medium supplemented with BAP at 0.3 mg/l of contrentration in compared to other studied BAP concentrations. The presence of NAA at 0.5 mg/l in medium containing BAP promoted a high rate of shoot multiplication. Highest value of shoot production was obtained on MS medium fortified with BAP (1.5 mg/l) and NAA (0.5 mg/l) from nodal segments. In next step, shoots were successfully rooted in vitro. A high number of roots per shoot and highest length of roots were obtained on MS medium containing 0.2 or 0.3 mg/l of NAA. High acclimatization frequencies were obtained when transferred rooted explants to rich soil, yellow clay soil and soil+sand mixture (1:1). Best survival rate (100%) was achieved on rich soil substrate during ex vitro acclimatization process.
Glutamate dehydrogenase (GDH, EC 1.4.1.2~4) là enzyme xúc tác phản ứng thuận nghịch khử amin hóa glutamate tới a-ketoglutarate hoặc 2-oxoglutarate. Chúng tôi xác định được mười gen mã hóa GDH trong hệ gen của cây đậu tương. Các protein GDH suy diễn có kích thước 637 hoặc 411 amino acid, ngoại trừ GmGDH06. Phân tích cây phả hệ được xây dựng từ các GHD của đậu tương và các cây khác cho thấy các GDH của đậu tương được xếp vào hai nhóm, hai gen nhóm I và tám gen nhóm II. Các protein nhóm II có motif bảo thủ tín hiệu khu trú ti thể, motif bảo thủ gắn cơ chất đặc hiệu a-ketoglutarate và vùng gắn đặc hiệu coenzyme NADH. Các protein nhóm I cũng có vùng gắn cơ chất đặc hiệu nhưng có vùng gắn coenzyme NADPH. Sự biểu hiện của các gen GDH của cây đậu tương khác nhau ở các mô khác nhau. Bốn gen GmGDH03, GmGDH04, GmGDH05và GmGDH07 biểu hiện ở tất cả các mô ở tất cả các giai đoạn phát triển được nghiên cứu. Các GmGDH biểu hiện ở mô sinh sản mạnh hơn ở mô sinh dưỡng, ngoại trừ GmGDH06, gen biểu hiện đặc hiệu ở nốt sần.
In plants, Zinc and Iron are transported through the membrane by proteins belonging to Zinc-Iron permease (ZIP: ZRT/IRT-like Protein). In this work, the ZIP gene families were identified in the genome of five legume species. The results demonstrated that the ZIPs were belonged to a multigeneic family in each species including soybean (28 genes), Medicago truncalata (16 genes), chickpea (7 genes), pigeon pea (12 genes), and Lotus japonicus (15 genes). Each gene contained from one to twelve introns. ZIP proteins possessed a conserved histidine-rich motif. Most of these proteins contained eight putative transmembrane domains and were predicted to be localized in plasma membranes. The phylogeny analysis showed that the legume ZIPs were classified into four main groups, each of which includes many subgroups. The group I contained the ZIP members of five examined plants. Moreover, the phylogeny showed gene gain events (expansion) in group I and gene loss events in other groups. The gene expansion in group I is likely to have arisen mainly from recent duplication events of ZIP genes in the examined legume plants, after specialization. The expression analysis showed that all of ZIP genes were expressed in all of the examined tissues in L. japonicus. The expression level of ZIP members was not similar in different tissues of the plant. Some ZIP genes were predominantly expressed in certain tissues for most of the legume species investigated.
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