scholarly journals Distribution of Endogenous Zeatin Riboside and Abscisic Acid in Tuberous Roots of Sweet Potato.

1991 ◽  
Vol 60 (2) ◽  
pp. 322-323 ◽  
Author(s):  
Makoto NAKATANI ◽  
Michitaka KOMEICHI
Keyword(s):  
Abscisic Acid ◽  
Sweet Potato ◽  
Zeatin Riboside ◽  
Tuberous Roots

MYB44 competitively inhibits the formation of the MYB340-bHLH2-NAC56 complex to regulate anthocyanin biosynthesis in purple-fleshed sweet potato

2020 ◽  
Author(s):  
Zeng-Zheng Wei ◽  
Kang-Di Hu ◽  
Dong-Lan Zhao ◽  
Jun Tang ◽  
Zhong-Qin Huang ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Regulatory Network ◽  
Anthocyanin Biosynthesis ◽  
Expression System ◽  
Firefly Luciferase ◽  
Anthocyanin Accumulation ◽  
Tuberous Roots ◽  
Regulatory Complex ◽  
Transcriptional Complex ◽  
Insight Into

Abstract Background: Anthocyanins, which have important biological functions and have a beneficial effect on human health, notably account for pigmentation in purple-fleshed sweet potato tuberous roots. Individual regulatory factors of anthocyanin biosynthesis have been identified; however, the regulatory network of anthocyanin biosynthesis in purple-fleshed sweet potato is unclear. Results: We functionally determined that IbMYB340 cotransformed with IbbHLH2 in tobacco and strawberry receptacles induced anthocyanin accumulation, and the addition of IbNAC56a or IbNAC56b caused increased pigmentation. Furthermore, we confirmed the interaction of IbMYB340 with IbbHLH2 and IbNAC56a or IbNAC56b via yeast two-hybrid and firefly luciferase complementation assays; these proteins could form a MYB340-bHLH2-NAC56a or MYB340-bHLH2-NAC56b transcriptional complex to regulate anthocyanin biosynthesis by binding to the IbANS promoter rather than the IbUFGT promoter. Furthermore, it was found by a transient expression system in tobacco leaves that IbMYB44 could decrease anthocyanin accumulation. Moreover, the interaction of IbMYB44 with IbMYB340 and IbNAC56a or IbNAC56b was verified. This result suggested that IbMYB44 acts as a repressor of anthocyanin in sweet potato.Conclusions: The repressor IbMYB44 affected anthocyanin biosynthesis by competitively inhibiting the IbMYB340-IbbHLH2-IbNAC56a or IbMYB340-IbbHLH2-IbNAC56b regulatory complex formation. Overall, the present study proposed a novel regulatory network whereby several vital TFs play key roles in regulating anthocyanin biosynthesis, and it provides strong insight into the potential mechanism underlying anthocyanin biosynthesis in sweet potato tuberous roots with purple color.

scholarly journals Potential of Pantoea dispersa as an effective biocontrol agent for black rot in sweet potato

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Lingmin Jiang ◽  
Jae Chul Jeong ◽  
Jung-Sook Lee ◽  
Jeong Mee Park ◽  
Jung-Wook Yang ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Vascular Tissue ◽  
Potato Cultivar ◽  
Biocontrol Agents ◽  
Blue Staining ◽  
Black Rot ◽  
Promising Alternative ◽  
Post Harvest ◽  
Potato Plants ◽  
Tuberous Roots

Abstract Biocontrol offers a promising alternative to synthetic fungicides for the control of a variety of pre- and post-harvest diseases of crops. Black rot, which is caused by the pathogenic fungus Ceratocytis fimbriata, is the most destructive post-harvest disease of sweet potato, but little is currently known about potential biocontrol agents for this fungus. Here, we isolated several microorganisms from the tuberous roots and shoots of field-grown sweet potato plants, and analyzed their ribosomal RNA gene sequences. The microorganisms belonging to the genus Pantoea made up a major portion of the microbes residing within the sweet potato plants, and fluorescence microscopy showed these microbes colonized the intercellular spaces of the vascular tissue in the sweet potato stems. Four P. dispersa strains strongly inhibited C. fimbriata mycelium growth and spore germination, and altered the morphology of the fungal hyphae. The detection of dead C. fimbriata cells using Evans blue staining suggested that these P. dispersa strains have fungicidal rather than fungistatic activity. Furthermore, P. dispersa strains significantly inhibited C. fimbriata growth on the leaves and tuberous roots of a susceptible sweet potato cultivar (“Yulmi”). These findings suggest that P. dispersa strains could inhibit black rot in sweet potato plants, highlighting their potential as biocontrol agents.

Bacterial endophytes of sweet potato tuberous roots affected by the plant genotype and growth stage

2015 ◽  
Vol 96 ◽  
pp. 273-281 ◽  
Author(s):  
Joana Montezano Marques ◽  
Thais Freitas da Silva ◽  
Renata Estebanez Vollú ◽  
Jackeline Rossetti Mateus de Lacerda ◽  
Arie Fitzgerald Blank ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Growth Stage ◽  
Bacterial Endophytes ◽  
Plant Genotype ◽  
Tuberous Roots

scholarly journals Relationship between bud number in seed branches and yield aspects of sweet potato

2021 ◽  
Vol 39 (4) ◽  
pp. 451-457
Author(s):  
Amanda C Perrud ◽  
Lorrayne G Bavaresco ◽  
André R Zeist ◽  
Murilo HS Leal ◽  
André D Silva Júnior ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Block Design ◽  
Ground Level ◽  
Growth And Yield ◽  
Root Number ◽  
Consumer Market ◽  
Market Values ◽  
Tuberous Roots ◽  
Randomized Complete Block Design ◽  
Below Ground

ABSTRACT Planting sweet potato branches with the appropriate bud number and disposition, below and above ground, can favor vegetative growth and yield that better fit the marketable standards. This study aimed to explore the influence of the number of buds and their distribution ratio, above and below ground level, on the agronomic and marketable components of sweet potato tuberous roots. The experiment was carried out in a randomized complete block design with three replications. The treatments were arranged in a factorial scheme (3 x 5), with 2, 4, and 8 above-ground buds combined with 2, 4, 6, 8, and 10 below-ground buds. Branches from the UZBD 06 accession (Canadense standard) were used. Vegetative, productive, and marketable traits of roots were evaluated. The use of branches with a greater number of buds above and below ground increased shoot dry biomass. Planting seed branches with 8 buds above and 8 buds below ground provided a greater number and production of marketable roots. The use of 10 buried buds increased root number and yield in the 150-450 g marketable classes, which the consumer market values the most.

Variations in abscisic acid, indole-3-acetic acid and zeatin riboside concentrations in two Mediterranean shrubs subjected to water stress

1996 ◽  
Vol 20 (3) ◽  
pp. 271-277 ◽  
Author(s):  
M. Lopez-Carbonell ◽  
L. Alegre ◽  
A. Pastor ◽  
E. Prinsen ◽  
H. van Onckelen
Keyword(s):  
Acetic Acid ◽  
Abscisic Acid ◽  
Water Stress ◽  
Zeatin Riboside ◽  
Mediterranean Shrubs ◽  
Indole 3 Acetic Acid
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