Response of Different Seedings to Growth and Yield in Yacon

HongSooDoo,류점호,최선영,이강수,박기훈,YoungKeunCheong 한국작물학회 2002 Korean journal of crop science Vol.47 No.6

The seedlings of yacon (Polymnia sonchifolia Poeppig & Endlicher), which were cuttings, plug seedling (PS), crown bud before sprouting (CBBS), crown bud after sprouting (CBAS), and divided seedling after budding (DSAB) were planted at 70×50 ㎝ planting distance on ridge; that was interow spacingintrarow spacing, and about 28,500±71 plants/ha. CBBS didn''''t need work and equipment to raise seedlings. PS and DSAB grew taller to 140.5 and 143.3㎝, respectively, than others at 150 days after planting. In the changes of plant height, PS and DSAB showed taller than others during growth period, cuttings, CBBS, and CBAS grew rapidly in middle growth stage. Excepting main stem and petiole length, other characters were significant for seedling. Fresh weights were different among seedlings. Even though the yield of plants grown from CBAS and CBBS were lower with 34.7 and 36.4 ton/ha, respectively, than 3.6 ton/ha of DSAB; its yield index were over 95%, hence, those of plants grown from cutting and PS were lower with 73 and 87%, respectively. The ratio of tuberous roots over 200g to total tuberous roots per plant was the highest from DSAB. Most of tuberous roots were under 200g per tuberous root from cuttings. CBBS, CBAS, and DSAB are suitable to use seedlings for high yield of yacono. Yacon plant by DSAB much produced tuberous root of over 200g.

Growth Analysis between Determinate and Indeterminate Growth Types in Sesame

Hong Soo Doo,Myung Kyu Oh,Ki Hun Park,Duck Yong Suh,Jeom Ho Ryu 한국육종학회 2003 한국육종학회지 Vol.35 No.2

Growth analysis was conducted with three diff erent growth types of sesame to compare the growth characteristics among types and to obtain the basic information for breeding high yielding sesame. Dif ferent growth types showed dif ferent rate of inrease i

Development and Characterization of Interspecific Hybrids among Arachis species

Hong Soo Doo,Young Keun Cheong,Ki Hun Park,Jeom Ho Ryu 한국육종학회 2007 한국육종학회지 Vol.39 No.2

Wild peanut species have proven to be an important germplasm resource. The objective of this study was to characterize interspecific crossability among 3 cultivars and 5 wild species of the peanut. Hybrids were acquired from crosses among three cultivars and five wild diploid species, respectively. A. sylvestirs A. Chev. evidenced the highest degree of crossability among the three cultivars. In the Valencia type, the combination of A. hypogaea L. cv. IT187846 and A. sylvestirs A. Chev. formed 32.7% pegs. Pods were developed in 98.8%, and seeds were produced at a rate of 49.4%, a higher percentage than was observed with the Virginia or Spanish types. Peg formation from pollinated flowers was increased by 18.4∼62.1% via the application of GA3, as opposed to the 26.3∼34.7% control value. The combination of A. hypogaea L. cv. Daekwang and A. batizocoi Krapov. & W. C. Gregory resulted in 93.9% peg formation. Seeds set in 24.2∼26.9% from the pegs, representing a 4.2∼16.3% increase over the 10.8∼24.3% control values. As the result of GA3 treatment of flowers after pollination, the peg emergence ratio increased significantly, but seed formation increased only by a small amount. The pods of the interspecific hybrid were smaller than those of A. hypogaea L. cv. Daekwang, and a portion of the pod had immature seeds or abnormal seeds. Via PCR-RAPD method, we were able to determine that the exotic DNA had been integrated from A. batizocoi Krapov. & W. C. Gregory to A. hypogaea L. cv. Daekwang.

Morphological Characteristics and Relationships among Arachis Species

Hong Soo Doo,Young Keun Cheong,Ki Hun Park,Jeom Ho Ryu 한국육종학회 2007 한국육종학회지 Vol.39 No.2

The genus Arachis L. is distributed widely throughout South America. This genus encompasses 80 described species, and 31 species belong to section Arachis, which is divided into diploid and tetraploid species. The objective of this study was to determine the morphological characteristics and genetic relationships among A. hypogaea L. cv. Daekwang and thirteen germplasms, using RAPD techniques. Peanut plants were cultivated in pots (1.2x0.8 m2) with clay loam in a glass-covered greenhouse and genetic relationship was identified by DNA polymorphisms using PCR. Thirteen germplasms bloomed between June 18th and June 25th, the majority of which bloomed 3∼10 days later than Daekwang (June 15th). The leaf size of A. batizocoi Krapov. & W. C. Gregory was similar to that of Daekwang, three germplasms, A. monticola Krapov. & Rig., A. paraguariensis Chodat & Hassler, and A. dardani Krapov. & W. C. Gregory, were bigger than Daekwang, but the others were smaller. Twelve germplasms evidenced peduncle longer than those of A. hypogaea L. cv. Daekwang. All of the seeds of the germplasms were smaller than those of Daekwang (76.2 g), and the weight of 100 mature seeds ranged from 6.0∼36.1 g in sections Arachis, Erectoides, Procumbentes, and Heteranthaes. The genetic relationship distance was determined among Daekwang, A. sylvestris, A. monticola, and A. batizocoi.

Changes of Chemical Composition in Tuberous Root of Yacon by Different Curing Conditions

Hong Soo Doo 韓國作物學會 2000 Korean journal of crop science Vol.45 No.2

Tuberous root of yacon (Polymnia sonchifolia Poeppig & Endlicher) has not starch, and its brix degree changes during the curing. Therefore its chemical composition changes were investigated according to different curing conditions. Tuberous root contained 87.1% moisture at harvesting, that was decreased to 84.1-86.0% at 30 days after curing in different curing conditions. Brix degree was increased from 5.7 to 14.2-15.8% at 30 days after curing in comparison to at harvesting. Free sugars were detected from tuberous root in yacon by HPLC; that were fructose, glucose and sucrose. Fructose contents were increased from 0.09 to 1.04-1.79% during 30 days in five curing conditions. Glucose contents were shown to increase from 0.03 to 1.04-1.37 %. Sucrose contents were shown to increase from 0.04 to 0.13-0.43%. Tuberous root contained fructose, glucose and sucrose in order of amount that were highest in single-polyethylene film covered green house. Sucrose was little as comparison with fructose and glucose. Fructose and glucose were increased to 16.7 and 40.7 times, respectively, but sucrose was increased little about 6.8 times.

Response of Different Seedlings to Growth and Yield in Yacon

Hong Soo Doo,Jeom Ho Ryu,Kang Soo Lee,Sun Young Choi,Young Keun Cheong,Ki Hun Park 韓國作物學會 2002 Korean journal of crop science Vol.47 No.5

The seedlings of yacon (Polymnia sonchifolia Poeppig & Endlicher), which were cuttings, plug seedling (PS), crown bud before sprouting (CBBS), crown bud after sprouting (CBAS), and divided seedling after budding (DSAB) were planted at 70~times 50 cm planting distance on ridge; that was interow spacingintrarow spacing, and about 28,500~pm 71 plants/ha. CBBS didn't need work and equipment to raise seedlings. PS and DSAB grew taller to 140.5 and 143.3cm, respectively, than others at 150 days after planting. In the changes of plant height, PS and DSAB showed taller than others during growth period, cuttings, CBBS, and CBAS grew rapidly in middle growth stage. Excepting main stem and petiole length, other characters were significant for seedling. Fresh weights were different among seedlings. Even though the yield of plants grown from CBAS and CBBS were lower with 34.7 and 36.4 ton/ha, respectively, than 3.6 ton/ha of DSAB; its yield index were over 95%, hence, those of plants grown from cutting and PS were lower with 73 and 87%, respectively. The ratio of tuberous roots over 200g to total tuberous roots per plant was the highest from DSAB. Most of tuberous roots were under 200g per tuberous root from cuttings. CBBS, CBAS, and DSAB are suitable to use seedlings for high yield of yacono. Yacon plant by DSAB much produced tuberous root of over 200g.

Quantitative Growth Analysis of White and Reddish Sword Bean

Hong Soo Doo,Sun Young Choi,Seung Kyoung Song,Jeom Ho Ryu 韓國作物學會 2001 Korean journal of crop science Vol.46 No.2

Sword bean belongs to the subgenus Canavalia in the genus Canavalia. White and reddish varieties in sword bean were tested to obtain the basic information for improving the yield, quality, and cultural environments through the quantitative growth analysis. Growing plants were sampled at intervals of 10 days from 20 days after sowing. Whole plant weight increased during the period of 11-20 days after sowing in both varieties. The weight of each organ between two varieties increased similarly except leaf area. Whole plant weight changed more close to pod weight than any other characters. The leaf areas of both varieties increased from 50 days after sowing, var. white displayed S type curved line but var. reddish displayed slow S type curved line. The SGR of whole plant weight in both varieties had 3 maxima and 2 minima, 3 maxima and first minimum were shown at the same period but the second minimum was shown at different period. Both varieties showed bimodal curved line. All SGR of each organ and leaf area were shown the 2 maxima and 1 minimum in both varieties. The changes of SLA and LAR were not remarkable between two varieties but these were united together with the maximum of whole plant weight and root weight. ULWR and ULWR were shown similar in both varieties. Reddish variety was more prosperous in early growth stage than white variety because SLA, LAR and LWR were high. In surplus weight, both varieties increased rapidly during the period of 111-120 days after sowing that was applicable to the maximum SGR of pod weight. Surplus weight of var. white increased markedly during the same period comparing those of var. reddish.

Changes in Sugar Contents and Storability of Yacon under Different Storage Conditions

Hong Soo Doo,Hu Lin Li,Tae Oh Kwon,Jeom Ho Ryu 韓國作物學會 2000 Korean journal of crop science Vol.45 No.5

Tuberous roots of yacon (Polymnia sonchifolia Poeppig & Endlicher) were stored in different temperature and relative humidity conditions after curing for 30 days. Non-decadent percentage, moisture contents, brix degree and sugars were investigated. Whether temperature and relative humidity were high or not, most of the tuberous root decayed during storage, and the decayed percentage was increased as long as the storage period. In final, only 13% of tuberous roots remain intact at 4~circC , 85% relative humidity condition to be appeared best storage condition in this experiment and all of the tuberous root decayed in other storage conditions after 6 months. Moisture contents decreased a little in the high relative humidity. Even though tuberous roots decayed when stored at 10~circC and 20~circC , most of brix degree reached about 17.0. Fructose, glucose and sucrose contents were 1.65, 1.15 and 0.35% at early storage period, and 1.6, 1.1 and 0.5% after 6 months at 4~circC , 85% relative humidity, respectively. In 3 temperature conditions, fructose and glucose increased for a month and then decreased successively afterwards, but sucrose increased gradually during 6 months. Also in 4 relative humidity conditions, fructose, glucose and sucrose contents were changed with similar to that of in temperature. Changes of fructose and glucose were the same except on 4~circC , 85% relative humidity, that was lower level than moisture of tuberous root.

Sprouting Condition of Crown Bud and Plug Seedling Production in Yacon

Hong Soo Doo,Byung Kil Choo,Jeom Ho Ryu 韓國作物學會 1998 Korean journal of crop science Vol.43 No.4

The objectives of this study were to find the sprouting condition and to establish the optimum production methods of plug seedlings in yacon (Polymnia sonchifolia Poepp. & Endl.). The sprouting ratio was greatest at 30~pm 1~circC at 20 days after planting. Crowns with single buds were more effective than those with two or more buds for sprouting, which might be due to the apical dominance. Planting the shoots separated from crown after sprouting in the single- and double-layer polyethylene-covered greenhouses reduced seedling period with 25% and 50%, respectively. Planting the shoots after sprouting was more effective than planting the crown buds. Double-layer polyethylene-covered green-house was good for plug seedling production than open field or single-layer polyethylene-covered greenhouse. The bed soils composed of clay loam : compost or sand : compost (1:l=v:v) were more effective to produce plug seedlings than only clay loam, sand or compost. Seedlings could be produced at 30 days after planting in our studies

Effect of Plant Density on Growth Responses and Yield in Yacon

Hong-Soo Doo,Jeom-Ho Ryu,Kang-Soo Lee,Sun-Young Choi 韓國作物學會 2001 Korean journal of crop science Vol.46 No.5

This study was conducted to determine the optimal planting distance in cultivation of yacon (Polymnia sonchifolia Poeppig & Endlicher). Plug seedlings were planted with 6 different plant densities of 80 ~times 60, 80 ~times 50, 70 ~times 50, 70 ~times 45, 70 ~times 40 and 60 ~times 45 cm. The plant height and the petiole length were increased with increasing the planting distance. The tallest plant height of yacon was 165.4cm with the plant density of 80 ~times 60 cm. However, branch number per plant, leaf number on main stem and stem diameter were not significantly difference among planting densities. Tuberous root was harvested 31.42 tons/ha in 70 ~times 50 cm spacing. The ratio of heavier tuberous roots than 200 g to total tuberous roots decreased significantly according to increase of planting density. Fresh weights of shoot and root, contain the crown bud, were decreased, as planting distance was shorter. Tuberous root number was fewer but its weight was heavier in wide planting than in dense planting. We think that optimal planting density is about 30,000 plants/ha, if it were to be 70 cm row spacing, intrarow spacing should calculate about 47cm.