Use of Ipomoea trifida germ plasm for sweet potato improvement. 3. Development of 4x interspecific hybrids between Ipomoea batatas (L.) Lam. (2n=6x=90) and I. trifida (H.B.K) G. Don. (2n=2x=30) as storage-root initiators for wild species

1991 ◽  
Vol 83 (2) ◽  
pp. 159-163 ◽  
Author(s):  
G. Orjeda ◽  
R. Freyre ◽  
M. Iwanaga
Keyword(s):  
Sweet Potato ◽  
Wild Species ◽  
Interspecific Hybrids ◽  
Ipomoea Batatas ◽  
Germ Plasm ◽  
Storage Root ◽  
Ipomoea Trifida ◽  
Potato Improvement

Use of Ipomoea trifida (HBK.) G. Don germ plasm for sweet-potato improvement. 2. Fertility of synthetic hexaploids and triploids with 2n gametes of I. trifida, and their interspecific crossability with sweet potato

Genome ◽  
1991 ◽  
Vol 34 (2) ◽  
pp. 209-214 ◽  
Author(s):  
Rosanna Freyre ◽  
Masaru Iwanaga ◽  
Gisella Orjeda
Keyword(s):  
Sweet Potato ◽  
Egg Production ◽  
Ipomoea Batatas ◽  
2N Gametes ◽  
Pollen Production ◽  
2N Pollen ◽  
Ipomoea Trifida ◽  
Potato Improvement ◽  
Synthetic Hexaploids ◽  
Interspecific Crossability

Twenty-two synthetic hexaploids and 33 triploids with 2n pollen production of Ipomoea trifida were used in crosses to estimate their male and female fertility and their crossability with sweet potato, Ipomoea batatas (L.) Lam. Several important conclusions were drawn. (i) The fertility of pollen of the triploid plants was confirmed, which suggested they are truly functional 2n pollen. (ii) The average male fertility of hexaploid plants was higher than that of triploid with 2n pollen production plants. (iii) 2n egg production was observed in several triploid genotypes, (iv) From a polycross, 3079 seeds with normal shapes were produced. These represent a population of hexaploid I. trifida with a wide genetic base, and they may be important material for sweet-potato improvement, (v) A total of 3275 seeds were obtained from crosses with six sweet-potato female parents, of which only 60 germinated, indicating the existence of an interspecific barrier. The implications of 2n gametes for breeding and evolution of sweet potato are also discussed.Key words: Ipomoea batatas, Ipomoea trifida, 2n gametes, sexual polyploidization, triploid.

scholarly journals Comparative analysis of chloroplast genomes of cultivars and wild species of sweetpotato (Ipomoea batatas [L.] Lam)

BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Shizhuo Xiao ◽  
Pan Xu ◽  
Yitong Deng ◽  
Xibin Dai ◽  
Lukuan Zhao ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Genetic Structure ◽  
Chloroplast Genome ◽  
Wild Species ◽  
Ipomoea Batatas ◽  
Nuclear Genome ◽  
Ipomoea Trifida ◽  
Chloroplast Markers ◽  
Chloroplast Genomes ◽  
Chloroplast Dna Markers

Abstract Background Sweetpotato (Ipomoea batatas [L.] Lam.) is an important food crop. However, the genetic information of the nuclear genome of this species is difficult to determine accurately because of its large genome and complex genetic background. This drawback has limited studies on the origin, evolution, genetic diversity and other relevant studies on sweetpotato. Results The chloroplast genomes of 107 sweetpotato cultivars were sequenced, assembled and annotated. The resulting chloroplast genomes were comparatively analysed with the published chloroplast genomes of wild species of sweetpotato. High similarity and certain specificity were found among the chloroplast genomes of Ipomoea spp. Phylogenetic analysis could clearly distinguish wild species from cultivars. Ipomoea trifida and Ipomoea tabascana showed the closest relationship with the cultivars, and different haplotypes of ycf1 could be used to distinguish the cultivars from their wild relatives. The genetic structure was analyzed using variations in the chloroplast genome. Compared with traditional nuclear markers, the chloroplast markers designed based on the InDels on the chloroplast genome showed significant advantages. Conclusions Comparative analysis of chloroplast genomes of 107 cultivars and several wild species of sweetpotato was performed to help analyze the evolution, genetic structure and the development of chloroplast DNA markers of sweetpotato.

scholarly journals Potassium Fertilization Stimulates Sucrose-to-Starch Conversion and Root Formation in Sweet Potato (Ipomoea batatas (L.) Lam.)

2021 ◽  
Vol 22 (9) ◽  
pp. 4826
Author(s):  
Yang Gao ◽  
Zhonghou Tang ◽  
Houqiang Xia ◽  
Minfei Sheng ◽  
Ming Liu ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Ipomoea Batatas ◽  
Intercellular Co2 Concentration ◽  
Biomass Accumulation ◽  
Starch Accumulation ◽  
Storage Root ◽  
Root Yield ◽  
Starch Conversion ◽  
And Storage ◽  
Low K

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.

scholarly journals Effect of cutting position and vine pruning level on yield of Sweet Potato (Ipomoea Batatas L.)

1970 ◽  
pp. 01-05
Author(s):  
Ncube Netsai ◽  
Mutetwa Moses, Mtaita Tuarira
Keyword(s):  
Sweet Potato ◽  
Root Length ◽  
Ipomoea Batatas ◽  
Block Design ◽  
Root Diameter ◽  
Root Weight ◽  
Stem Cuttings ◽  
Storage Root ◽  
Storage Roots ◽  
Significant Difference

There is significant variation in yield of storage roots and vines of sweet potato (Ipomoea batatas) among farmers due to use of different cutting positions and pruning of vines at different levels. This study was carried out to establish the cutting position and the vine pruning level that give the best yield of both the storage roots and vines. The study was conducted in a 3x3 factorial arrangement in Randomized Complete Block Design (RCBD) with three replications. Treatments included cutting position at three levels (apical cutting, middle cutting and basal cutting) and pruning at three levels, 0%, 25% and 50% respectively. Pruning was done. 50 days after planting. And storage root harvesting was done 100 days after planting. The two measurements were summed up to give the total vine weight. Storage root length, diameter and weight were measured at 100 DAP. Storage root length indicated significant difference (P<0.05) only among cutting positions with highest mean length (16.20 cm) obtained from apical cutting and the lowest (11.98 cm) from basal cutting. Storage root diameter, storage root weight and vine weight indicated significant interaction (P<0.05) of cutting position and vine pruning level. Highest mean root diameter and root weight were obtained from middle cutting and 25% vine pruning level, with the lowest being obtained from basal cutting and 50% vine pruning level. Highest vine weight was recorded from middle cutting and 50% vine pruning level, with the lowest being recorded from basal cutting and 0% vine pruning level. Both middle and apical stem cuttings can be recommended for higher storage root and vine yield. Vine pruning at 25% can be adopted for higher storage root yield while pruning at 50% can be suggested for higher vine yield.

Sweet potato (Ipomoea batatas [L.] Lam ‘Tainong 57’) storage root mucilage with antioxidant activities in vitro

2006 ◽  
Vol 98 (4) ◽  
pp. 774-781 ◽  
Author(s):  
Dong-Jiann Huang ◽  
Hsien-Jung Chen ◽  
Wen-chi Hou ◽  
Chun-Der Lin ◽  
Yaw-Huei Lin
Keyword(s):  
Sweet Potato ◽  
Ipomoea Batatas ◽  
Antioxidant Activities ◽  
Storage Root ◽  
Root Mucilage

Use of Ipomoea trifida (HBK.) G. Don germ plasm for sweet potato improvement. 1. Development of synthetic hexaploids of I. trifida by ploidy-level manipulations

Genome ◽  
1991 ◽  
Vol 34 (2) ◽  
pp. 201-208 ◽  
Author(s):  
Masaru Iwanaga ◽  
Rosanna Freyre ◽  
Gisella Orjeda
Keyword(s):  
Sweet Potato ◽  
Ploidy Level ◽  
Ipomoea Batatas ◽  
Colchicine Treatment ◽  
Pollen Production ◽  
2N Pollen ◽  
Ipomoea Trifida ◽  
Pollen Sample ◽  
Colchicine Solution ◽  
Synthetic Hexaploids

Crosses were made between 21 tetraploid accessions and 41 diploid accessions of Ipomoea trifida, obtaining a total of 9185 triploid seeds from 215 different cross combinations. Doubling the somatic chromosome number of the triploids was attempted by colchicine treatment on young seedlings to obtain synthetic hexaploids. A total of 787 axillary buds of 316 triploid plants were treated with a 0.5% colchicine solution for 24 h, applied to cotton plugs surrounding the buds. The survival rate of the treated buds was, on average, 41%. The ploidy level in germ-layer L2 was determined in 258 clones by evaluating a pollen sample from each clone. Fifty-five clones were selected for high stainability and pollen size. The selected genotypes were meiotically analyzed. Twenty-two of them were identified as hexaploid and 33 as triploid with 2n pollen production. The present study is the first report on 2n pollen production in triploid plants of Ipomoea species. The use of these triploid clones with 2n pollen production and synthetic hexaploid clones for sweet-potato breeding is discussed.Key words: Ipomoea batatas, Ipomoea trifida, colchicine, triploids, 2n pollen.

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