Combining ability and heterosis of selected sweetpotato (Ipomoea batatas L.) clones for storage root yield, yield-related traits and resistance to sweetpotato virus disease

A field experiment was established to study sweet potato growth, starch dynamic accumulation, key enzymes and gene transcription in the sucrose-to-starch conversion and their relationships under six K2O rates using Ningzishu 1 (sensitive to low-K) and Xushu 32 (tolerant to low-K). The results indicated that K application significantly improved the biomass accumulation of plant and storage root, although treatments at high levels of K, i.e., 300–375 kg K2O ha−1, significantly decreased plant biomass and storage root yield. Compared with the no-K treatment, K application enhanced the biomass accumulation of plant and storage root by 3–47% and 13–45%, respectively, through promoting the biomass accumulation rate. Additionally, K application also enhanced the photosynthetic capacity of sweet potato. In this study, low stomatal conductance and net photosynthetic rate (Pn) accompanied with decreased intercellular CO2 concentration were observed in the no-K treatment at 35 DAT, indicating that Pn was reduced mainly due to stomatal limitation; at 55 DAT, reduced Pn in the no-K treatment was caused by non-stomatal factors. Compared with the no-K treatment, the content of sucrose, amylose and amylopectin decreased by 9–34%, 9–23% and 6–19%, respectively, but starch accumulation increased by 11–21% under K supply. The activities of sucrose synthetase (SuSy), adenosine-diphosphate-glucose pyrophosphorylase (AGPase), starch synthase (SSS) and the transcription of Susy, AGP, SSS34 and SSS67 were enhanced by K application and had positive relationships with starch accumulation. Therefore, K application promoted starch accumulation and storage root yield through regulating the activities and genes transcription of SuSy, AGPase and SSS in the sucrose-to-starch conversion.

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Combining Ability Analysis of Storage Root Yield and Related Traits in Cassava at the Seedling Evaluation Stage of Breeding

Journal of Crop Improvement ◽

10.1080/15427528.2014.923798 ◽

2014 ◽

Vol 28 (4) ◽

pp. 530-546 ◽

Cited By ~ 5

Author(s):

Robooni Tumuhimbise ◽

Paul Shanahan ◽

Rob Melis ◽

Robert Kawuki

Keyword(s):

Combining Ability ◽

Storage Root ◽

Root Yield ◽

Combining Ability Analysis ◽

Evaluation Stage

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Genotype-by-environment interaction of newly-developed sweet potato genotypes for storage root yield, yield-related traits and resistance to sweet potato virus disease

Heliyon ◽

10.1016/j.heliyon.2019.e01448 ◽

2019 ◽

Vol 5 (3) ◽

pp. e01448 ◽

Cited By ~ 3

Author(s):

Stephan Ngailo ◽

Hussein Shimelis ◽

Julia Sibiya ◽

Kiddo Mtunda ◽

Jacob Mashilo

Keyword(s):

Sweet Potato ◽

Virus Disease ◽

Genotype By Environment Interaction ◽

Environment Interaction ◽

Storage Root ◽

Root Yield ◽

Genotype By Environment ◽

Potato Virus Disease ◽

Sweet Potato Virus ◽

Sweet Potato Virus Disease

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Cultivar decline in sweetpotato (Ipomoea batatas)

New Zealand Plant Protection ◽

10.30843/nzpp.2011.64.5976 ◽

2011 ◽

Vol 64 ◽

pp. 160-167 ◽

Cited By ~ 1

Author(s):

S.L. Lewthwaite ◽

P.J. Fletcher ◽

J.D. Fletcher ◽

C.M. Triggs

Keyword(s):

New Zealand ◽

Virus Infection ◽

Ipomoea Batatas ◽

Storage Root ◽

Spontaneous Mutations ◽

Production Environment ◽

Root Yield ◽

Storage Roots ◽

Field Exposure ◽

Growing Seasons

The sweetpotato (Ipomoea batatas) crop is propagated vegetatively by field transplanting adventitious sprouts produced on storage roots retained from the previous seasons harvest This system promotes the persistence and accumulation of both viruses and spontaneous mutations A phenomenon known as cultivar decline has been reported internationally where the root yield and appearance of commercially grown sweetpotato cultivars appear to deteriorate over successive growing seasons The relative contributions of virus infection and plant mutation to cultivar decline are uncertain but both issues are addressed through the use of virustested tissue cultured propagation systems This study assessed the degree of decline for cultivars Owairaka Red and Beauregard within the New Zealand biophysical production environment Storage root yield decreased significantly with increasing field exposure for both cultivars (P

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Effect of Nutrient Solution Concentration on the Growth of Hydroponic Sweetpotato

Agronomy ◽

10.3390/agronomy10111708 ◽

2020 ◽

Vol 10 (11) ◽

pp. 1708

Author(s):

Masaru Sakamoto ◽

Takahiro Suzuki

Keyword(s):

Nutrient Solution ◽

Ipomoea Batatas ◽

Critical Factor ◽

Solution Concentration ◽

Growth And Yield ◽

Storage Root ◽

Root Yield ◽

Cultivation Period ◽

Significant Difference ◽

And Storage

Nutrient solution concentration (NSC) is a critical factor affecting plant growth in hydroponics. Here, we investigated the effects of hydroponic NSC on the growth and yield of sweetpotato (Ipomoea batatas (L.) Lam.) plants. First, sweetpotato cuttings were cultivated hydroponically in three different NSCs with low, medium, or high electrical conductivity (EC; 0.8, 1.4, and 2.6 dS m−1, respectively). Shoot growth and storage root yield increased at 143 days after plantation (DAP), depending on the NSC. Next, we examined the effect of NSC changes at half of the cultivation period on the growth and yield, using high and low NSC conditions. In plants transferred from high to low EC (HL plants), the number of attached leaves increased toward the end of the first half of the cultivation period (73 DAP), compared with plants transferred from low to high EC (LH plants). Additionally, the number of attached leaves decreased in HL plants from 73 DAP to the end of the cultivation period (155 DAP), whereas this value increased in LH plants. These changes occurred due to a high leaf abscission ratio in HL plants. The storage root yield showed no significant difference between HL and LH plants. Our results suggest that the regulation of hydroponic NSC during the cultivation period affects the growth characteristics of sweetpotato.

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Effects of Viruses (SPVD) on Growth and Yield of Sweet Potato

Experimental Agriculture ◽

10.1017/s0014479700010310 ◽

1979 ◽

Vol 15 (3) ◽

pp. 253-256 ◽

Cited By ~ 34

Author(s):

S. K. Hahn

Keyword(s):

Sweet Potato ◽

Ipomoea Batatas ◽

Virus Disease ◽

Severe Disease ◽

Growth And Yield ◽

Root Yield ◽

Disease Symptoms ◽

Vein Clearing ◽

Chlorophyll Level ◽

Yield Trials

SUMMARYSweet potato (Ipomoea batatas L.) virus disease (SPVD) causes severe disease symptoms of various combinations of leaf strapping, vein-clearing, puckering and stunting. The disease is widespread, especially in Africa, and yield is adversely affected, though there are no figures to quantify this effect nor is it known how yield is affected. Loss of tuberous root yield due to SPVD was studied in sweet potato showing symptoms of the disease. Slips were obtained from plants with and without symptoms and two yield trials in 2 years were conducted by planting them alternately in rows. Yield of fresh tubers was reduced by 78% in plants showing SPVD symptoms but the reduced chlorophyll level of diseased leaves did not appear to affect yield.

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Adaptation to mid-season drought in a sweetpotato (Ipomoea batatas [L.] Lam) germplasm collection grown in Mozambique

Open Agriculture ◽

10.1515/opag-2017-0012 ◽

2017 ◽

Vol 2 (1) ◽

Cited By ~ 1

Author(s):

Godwill S. Makunde ◽

Maria I. Andrade ◽

Jose Ricardo ◽

Abilio Alvaro ◽

Joana Menomussanga ◽

...

Keyword(s):

Drought Tolerance ◽

Harvest Index ◽

Ipomoea Batatas ◽

Block Design ◽

Geometric Mean ◽

Germplasm Collection ◽

High Yield ◽

Research Station ◽

Storage Root ◽

Root Yield

AbstractDrought has negative effects on sweetpotato production. Two experiments with two watering treatments (irrigated and water-stressed) were conducted at Umbeluzi Research Station in 2015. The objectives were to (i) determine response of 48 sweetpotato germplasms to mid-season drought, (ii) determine best traits for improvement of storage root yield under mid-season drought and (iii) assess the selection criteria for identifying drought tolerance in sweetpotato germplasms. The irrigated and water- stressed trials received 640 and 400 mm of water, respectively, throughout the season. Water stress was imposed from 30 to 70 days after planting. Each treatment had two replicates arranged in a randomized complete block design. Data collected on storage root and vine yield and derived drought tolerance indices including harvest index were subjected to analysis of variance in R. Sweetpotato germplasms with high storage root yield under mid-season drought were associated with a high harvest index. Harvest index stability and the geometric mean are key to identifying cultivars with high and stable storage root yield under both treatments. MUSGP0646-126, Irene and Ivone combined both low TOL, SSI, HI and high yield storage root yield across the treatments and over seasons. The use of drought and harvest indices is encouraged for selecting improved cultivars for varied production environments and their regular use in accelerated breeding schemes is suggested.

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Combining Ability, Heterosis, and Heritability of Storage Root Dry Matter, Beta-Carotene, and Yield-related Traits in Sweetpotato

HortScience ◽

10.21273/hortsci12280-17 ◽

2018 ◽

Vol 53 (2) ◽

pp. 167-175 ◽

Cited By ~ 5

Author(s):

Fekadu Gurmu ◽

Shimelis Hussein ◽

Mark Laing

Keyword(s):

Combining Ability ◽

Dry Matter ◽

Breeding Value ◽

Dry Matter Content ◽

Storage Root ◽

Root Yield ◽

Carotene Content ◽

Positive Heterosis ◽

High Storage ◽

Β Carotene

Orange-fleshed sweetpotato (OFSP) is an effective, low-priced, and sustainable source of β-carotene (provitamin A). However, most OFSP varieties have low storage root dry matter content (DMC), which influences their acceptance by small-scale farmers and hence needs to be improved. The objective of the study was to determine the combining ability, type of gene action, heterosis and heritability of storage root DMC, β-carotene content, and yield-related traits of selected sweetpotato clones for further evaluation and breeding. Crosses were conducted using a 7 × 7 half-diallel mating design and a total of 28 genotypes (seven parents and 21 crosses) were evaluated at four locations in Ethiopia using a 7 × 4 alpha lattice design with two replications. The performance of the genotypes was significantly different (P < 0.01) across the four locations for storage root DMC, β-carotene content, sweetpotato virus disease (SPVD) reaction, storage root yield, and harvest index (HI). The general combining ability (GCA) and specific combining ability (SCA) mean squares were significant (P < 0.01) for all traits except the SCA effect of storage root DMC. The GCA to SCA variance ratios were 0.96, 0.94, 0.74, 0.96, and 0.97 for storage root DMC, β-carotene content, SPVD, fresh storage root yield, and HI, respectively, indicating that the inheritance of these traits was controlled mainly by additive genes. Progenies of crosses involving Ukerewe × Ejumula, Ukerewe × Pipi, Resisto × Pipi, and Ejumula × Pipi exhibited high levels of positive heterosis for storage root DMC. Similarly, progenies of crosses including Resisto × Pipi and Resisto × Ogansagan had higher positive heterosis for fresh storage root yield, reflecting the breeding value of these parents. Relatively high narrow sense heritability (h2) was obtained for β-carotene content (79.8%) and HI (48.6%). However, the h2 estimates of storage root DMC, SPVD, and fresh storage root yield were relatively low at 19.0%, 14.9%, and 20.4%, respectively. Crosses with high β-carotene content such as Ukerewe × Resisto, Resisto × Ogansagan, Eumula × Pipi, and NASPOT 1 × Temesgen exhibited high storage root DMC. These families also had medium-to-high mean fresh storage root yield. Therefore, progenies derived from these families are good candidates to develop improved OFSP varieties with high storage root DMC.

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