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Inheritance of low pasting temperature in sweetpotato starch and the dosage effect of wild-type alleles.

Katayama K, Tamiya S, Sakai T, Kai Y, Ohara-Takada A, Kuranouchi T, Yoshinaga M - Breed. Sci. (2015)

Bottom Line: The results from analyzing these progenies suggested that this trait is a qualitative character controlled by one recessive allele (designated spt), which is inherited in a hexasomic manner.A dosage effect of the wild-type Spt allele was found for starch pasting temperature, although the effect was not linear.These results will aid breeders to develop sweetpotato cultivars with a range of starch pasting temperatures.

View Article: PubMed Central - PubMed

Affiliation: NARO Institute of Crop Science , 2-1-18 Kannondai, Tsukuba, Ibaraki 305-8518 , Japan ; NARO Kyushu Okinawa Agricultural Research Center , 6651-2 Yokoichi, Miyakonojo, Miyazaki 885-0091 , Japan.

ABSTRACT
Sweetpotato (Ipomoea batatas (L.) Lam.), which is an outcrossing hexaploid, is one of the most important starch-producing crops in the world. During the last decade, new sweetpotato cultivars, e.g. 'Quick Sweet', which have approximately 20°C lower pasting temperature, slower retrogradation and higher digestibility of raw starch than ordinary cultivars, have been developed in Japan. Genetic analysis of these variants with low pasting temperature starch was conducted in this study. Using 8 variants and 15 normal clones, 26 families were generated. The results from analyzing these progenies suggested that this trait is a qualitative character controlled by one recessive allele (designated spt), which is inherited in a hexasomic manner. A dosage effect of the wild-type Spt allele was found for starch pasting temperature, although the effect was not linear. These results will aid breeders to develop sweetpotato cultivars with a range of starch pasting temperatures.

No MeSH data available.


Relationship between starch pasting temperature and the number of wild-type Spt alleles. Each box shows the mean pasting temperature of each parent examined in multi-year.
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f2-65_352: Relationship between starch pasting temperature and the number of wild-type Spt alleles. Each box shows the mean pasting temperature of each parent examined in multi-year.

Mentions: Fig. 2 shows the relationship between pasting temperature and the number of wild-type Spt alleles in the crossing parents. The variants of iplex genotypes (ssssss) had approximately 15–20°C lower pasting temperature than the quadruplex (SSSSss) and pentaplex (SSSSSs)/hexaplex (SSSSSS) genotypes, which showed normal phenotypes. The simplex genotypes (Ssssss) had approximately 10°C lower pasting temperature than the normal phenotypes (≥SSSS). The duplex (SSssss) and triplex (SSSsss) genotypes had similar pasting temperatures for the normal phenotypes (≥SSSS), or slightly lower pasting temperatures than the normal phenotypes (≥SSSS). A dosage effect of wild-type Spt alleles was found for starch pasting temperature, although the effect was not linear.


Inheritance of low pasting temperature in sweetpotato starch and the dosage effect of wild-type alleles.

Katayama K, Tamiya S, Sakai T, Kai Y, Ohara-Takada A, Kuranouchi T, Yoshinaga M - Breed. Sci. (2015)

Relationship between starch pasting temperature and the number of wild-type Spt alleles. Each box shows the mean pasting temperature of each parent examined in multi-year.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4542937&req=5

f2-65_352: Relationship between starch pasting temperature and the number of wild-type Spt alleles. Each box shows the mean pasting temperature of each parent examined in multi-year.
Mentions: Fig. 2 shows the relationship between pasting temperature and the number of wild-type Spt alleles in the crossing parents. The variants of iplex genotypes (ssssss) had approximately 15–20°C lower pasting temperature than the quadruplex (SSSSss) and pentaplex (SSSSSs)/hexaplex (SSSSSS) genotypes, which showed normal phenotypes. The simplex genotypes (Ssssss) had approximately 10°C lower pasting temperature than the normal phenotypes (≥SSSS). The duplex (SSssss) and triplex (SSSsss) genotypes had similar pasting temperatures for the normal phenotypes (≥SSSS), or slightly lower pasting temperatures than the normal phenotypes (≥SSSS). A dosage effect of wild-type Spt alleles was found for starch pasting temperature, although the effect was not linear.

Bottom Line: The results from analyzing these progenies suggested that this trait is a qualitative character controlled by one recessive allele (designated spt), which is inherited in a hexasomic manner.A dosage effect of the wild-type Spt allele was found for starch pasting temperature, although the effect was not linear.These results will aid breeders to develop sweetpotato cultivars with a range of starch pasting temperatures.

View Article: PubMed Central - PubMed

Affiliation: NARO Institute of Crop Science , 2-1-18 Kannondai, Tsukuba, Ibaraki 305-8518 , Japan ; NARO Kyushu Okinawa Agricultural Research Center , 6651-2 Yokoichi, Miyakonojo, Miyazaki 885-0091 , Japan.

ABSTRACT
Sweetpotato (Ipomoea batatas (L.) Lam.), which is an outcrossing hexaploid, is one of the most important starch-producing crops in the world. During the last decade, new sweetpotato cultivars, e.g. 'Quick Sweet', which have approximately 20°C lower pasting temperature, slower retrogradation and higher digestibility of raw starch than ordinary cultivars, have been developed in Japan. Genetic analysis of these variants with low pasting temperature starch was conducted in this study. Using 8 variants and 15 normal clones, 26 families were generated. The results from analyzing these progenies suggested that this trait is a qualitative character controlled by one recessive allele (designated spt), which is inherited in a hexasomic manner. A dosage effect of the wild-type Spt allele was found for starch pasting temperature, although the effect was not linear. These results will aid breeders to develop sweetpotato cultivars with a range of starch pasting temperatures.

No MeSH data available.