Inheritance of resistance in water yam (Dioscorea alata) to anthracnose (Colletotrichum gloeosporioides)

2001 ◽  
Vol 103 (1) ◽  
pp. 52-55 ◽  
Author(s):  
H. D. Mignouna ◽  
M. M. Abang ◽  
K. R. Green ◽  
R. Asiedu
Keyword(s):  
Colletotrichum Gloeosporioides ◽  
Dioscorea Alata ◽  
Inheritance Of Resistance ◽  
Water Yam

scholarly journals Ethephon for induction of multiple tubers in water yam (D. alata)

1969 ◽  
Vol 73 (3) ◽  
pp. 195-201
Author(s):  
Ricardo Goenaga ◽  
Héber Irizarry ◽  
Edmundo Rivera
Keyword(s):  
Colletotrichum Gloeosporioides ◽  
Total Yield ◽  
Hormone Treatment ◽  
Tuber Size ◽  
Yield Potential ◽  
Dioscorea Alata ◽  
Head Section ◽  
Tuber Production ◽  
Ethephon Treatment ◽  
Water Yam

Yam cultivar Gunung (Dioscorea alata) is resistant to anthracnose (Colletotrichum gloeosporioides Penz.). It has an extraordinary yield potential. Yet its acceptability has been limited because of the frequent production of large-sized and off-shaped tubers which are difficult to market. Local growers will increasingly accept this cultivar if tuber size can be reduced without an undue loss in yield. A study was conducted to determine whether ethephon [(2-chloroethyl) phosphonic acid] can induce multiple stem sprouting and hence multiple tuber production as a means of reducing tuber size and improving shape. Head, middle, and tail tuber sections were treated with a 1% ethephon solution and planted in the field. The ethephon treatment significantly increased stem sprouting in the middle and tail sections but not in the head section. A significant reduction in mean tuber weight was observed in all treated sections. However, this reduction was compensated for by a significant increase in the number of tubers produced per plant. The hormone treatment did not significantly affect total yield but did lead to more production of uniform tubers. Mean yield of marketable tubers was 73,123 kg/ha.

scholarly journals Anatomical observation on release of tuber dormancy in water yam (Dioscorea alata L.)

2013 ◽  
Vol 8 (16) ◽  
pp. 1365-1369
Author(s):  
Shiwachi Hironobu ◽  
Chen Shuwan ◽  
Matsumoto Ryo ◽  
Sanada Atusi ◽  
Toyohara Hidekazu
Keyword(s):  
Dioscorea Alata ◽  
Tuber Dormancy ◽  
Water Yam

scholarly journals UTILIZATION OF WATER YAM (Dioscorea alata) AS A SOURCE OF ETHANOL

2021 ◽  
Vol 46 (1) ◽  
Author(s):  
A.M. Hashimi
Keyword(s):  
Raw Materials ◽  
Primary Alcohol ◽  
Raw Material ◽  
Dioscorea Alata ◽  
Fermentable Sugar ◽  
Iodine Solution ◽  
Indigenous Production ◽  
Job Opportunity ◽  
Alternative Sources ◽  
Water Yam

Ethanol (C2H5OH) is a primary alcohol which can be produced by fermentation, using any of the sources of carbohydrates such as sugarcane, cassava, grains and yam tubers among others. Production of ethanol fermented from renewable sources for fuel and fuel additives are known as bioethanol. Since the need of bioethanol is increasing, the production of bioethanol must be increased using cheaper and eco friendly raw materials. This study was conducted, using cheaper and eco friendly raw materials; water yam (Dioscorea alata) as alternative sources for ethanol production. The starch that was produced from water yam was hydrolysed into fermentable sugar, using acid hydrolysis. The fermentable sugar was converted into ethanol by fermentation process at pH 4.5 using fermenting brewer's yeast (Saccharomyces calsbergensis). Starch, glucose and ethanol which were obtained were analysed for physicochemical properties. Findings revealed that the starch sample obtained gave a blue-black colouration on addition of few drops of iodine solution. This confirmed that the carbohydrate content was mainly starch. On calculation of viability, findings further showed that water yam is a good raw material for production of ethanol, therefore indigenous production of ethanol obtained from water yam is economically viable and recommended. This will save the country from lot of money spends annually on the importation of ethanol and it can also provide job opportunity for many wandering and unemployed Nigerians.

The sprouting process in yam (Dioscorea spp.) tuber pieces

1973 ◽  
Vol 81 (3) ◽  
pp. 375-379 ◽  
Author(s):  
I. C. Onwueme
Keyword(s):  
Dioscorea Alata ◽  
Shoot Buds ◽  
Shoot Bud ◽  
Meristematic Cells ◽  
Cell Divisions ◽  
Large Tuber ◽  
Extensive Cell ◽  
Water Yam

SUMMARYThe progression of sprouting was observed in water-yam (Dioscorea alata) and whiteyam (D. rotundata) tuber pieces planted in moist sawdust. Soon after planting, white callus-like protuberances (sprouting loci) were seen on the tuber surface, followed by the appearance of one or more differentiated shoot buds on the sprouting locus. Sprouting loci appeared more readily on the upper and lower parts of each tuber piece than on the sides. Large tuber pieces sprouted more rapidly, had larger and more numerous sprouting loci, and gave rise to more shoot buds than small tuber pieces.Anatomical examination showed that the shoot bud resulted from the activity of a layer of meristematic cells lying close to the tuber surface. Extensive cell divisions commenced in this layer after planting, and some of the resulting cells soon differentiated into the shoot bud.

The Partial Characterization of a Badnavirus Infecting the Greater Asiatic or Water Yam (Dioscorea alata)

1999 ◽  
Vol 147 (5) ◽  
pp. 265-269 ◽  
Author(s):  
S. Phillips ◽  
R. W. Briddon ◽  
A. A. Brunt ◽  
R. Hull
Keyword(s):  
Partial Characterization ◽  
Dioscorea Alata ◽  
Water Yam

scholarly journals Genome-Wide Association Analysis for Tuber Dry Matter and Oxidative Browning in Water Yam (Dioscorea alata L.)

Plants ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 969 ◽  
Author(s):  
Cobes Gatarira ◽  
Paterne Agre ◽  
Ryo Matsumoto ◽  
Alex Edemodu ◽  
Victor Adetimirin ◽  
...  
Keyword(s):  
Association Analysis ◽  
Dry Matter ◽  
Significant Snps ◽  
Genome Wide Association ◽  
Enzymatic Oxidation ◽  
Dioscorea Alata ◽  
Quality Traits ◽  
Genome Wide ◽  
Tuber Dry Matter ◽  
Water Yam

Yam (Dioscorea spp.) is a nutritional and medicinal staple tuber crop grown in the tropics and sub-tropics. Among the food yam species, water yam (Dioscorea alata L.) is the most widely distributed and cultivated species worldwide. Tuber dry matter content (DMC) and oxidative browning (OxB) are important quality attributes that determine cultivar acceptability in water yam. This study used a single nucleotide polymorphism (SNP) assay from a diversity arrays technology (DArT) platform for a genome-wide association study (GWAS) of the two quality traits in a panel of 100 water yam clones grown in three environments. The marker–trait association analysis identified significant SNPs associated with tuber DMC on chromosomes 6 and 19 and with OxB on chromosome 5. The significant SNPs cumulatively explained 45.87 and 12.74% of the total phenotypic variation for the tuber DMC and OxB, respectively. Gene annotation for the significant SNP loci identified important genes associated in the process of the proteolytic modification of carbohydrates in the dry matter accumulation pathway as well as fatty acid β-oxidation in peroxisome for enzymatic oxidation. Additional putative genes were also identified in the peak SNP sites for both tuber dry matter and enzymatic oxidation with unknown functions. The results of this study provide valuable insight for further dissection of the genetic architecture of tuber dry matter and enzymatic oxidation in water yam. They also highlight SNP variants and genes useful for genomics-informed selection decisions in the breeding process for improving food quality traits in water yam.

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