This experiment was conducted to clarify the functions of supernodulating characters on seed yield determination through the comparison of agricultural traits of supernodulating soybean mutants, Sakukei4, SS2-2, and their parent cultivars, Enrei and Shinpaldalkong2. The plant dry weights of supernod...
This experiment was conducted to clarify the functions of supernodulating characters on seed yield determination through the comparison of agricultural traits of supernodulating soybean mutants, Sakukei4, SS2-2, and their parent cultivars, Enrei and Shinpaldalkong2. The plant dry weights of supernodulating mutants, Sakukei4 and SS2-2, were $52\%$ and $61\%$ of their wild type parents at full seed stage (R6). However, the relative growth rate (RGR) from the pod set stage (R3) to R6 of Sakukei4 was 0.022 g/g/day and that of SS2-2 was 0.016 g/g/day, which were higher than those of their parents. Nodule number and dry weight were increased in two supernodulating mutants by the R6 stage. The nitrogen concentrations of leaf, petiole and stem of Sakukei4 were higher than those of Enrei. SS2-2 showed higher nitrogen concentration in petiole than Shinpaldalkong2 had. The positive correlations were appeared between nodule dry weight, plant dry weight and pod number, in two supernodulating mutants during the period from R3 to R6 stage. Although all of the yield components and seed yield were lower in two supernodulating mutants than their parents at the stage of full maturity (R8), the harvest index was higher in supernodulating mutants. The increasing rates of pod number to stem dry weight in two supernodulating mutants showed the higher than those of two their parents at R8 stage. In conclusion, the relative growth rates during the early to the middle reproductive growth period were higher in supernodulating mutants than the wild types. This could be resulted in an increase in pod number. The increase of relative growth rate was the result of the successive supplement of nitrogen source from biological nitrogen fixation (BNF) of nodules during the middle reproductive growth period in supernodulating mutants.
This experiment was conducted to clarify the functions of supernodulating characters on seed yield determination through the comparison of agricultural traits of supernodulating soybean mutants, Sakukei4, SS2-2, and their parent cultivars, Enrei and Shinpaldalkong2. The plant dry weights of supernodulating mutants, Sakukei4 and SS2-2, were $52\%$ and $61\%$ of their wild type parents at full seed stage (R6). However, the relative growth rate (RGR) from the pod set stage (R3) to R6 of Sakukei4 was 0.022 g/g/day and that of SS2-2 was 0.016 g/g/day, which were higher than those of their parents. Nodule number and dry weight were increased in two supernodulating mutants by the R6 stage. The nitrogen concentrations of leaf, petiole and stem of Sakukei4 were higher than those of Enrei. SS2-2 showed higher nitrogen concentration in petiole than Shinpaldalkong2 had. The positive correlations were appeared between nodule dry weight, plant dry weight and pod number, in two supernodulating mutants during the period from R3 to R6 stage. Although all of the yield components and seed yield were lower in two supernodulating mutants than their parents at the stage of full maturity (R8), the harvest index was higher in supernodulating mutants. The increasing rates of pod number to stem dry weight in two supernodulating mutants showed the higher than those of two their parents at R8 stage. In conclusion, the relative growth rates during the early to the middle reproductive growth period were higher in supernodulating mutants than the wild types. This could be resulted in an increase in pod number. The increase of relative growth rate was the result of the successive supplement of nitrogen source from biological nitrogen fixation (BNF) of nodules during the middle reproductive growth period in supernodulating mutants.
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문제 정의
Therefore, we thought that the extended nodule life time to middle reproductive growth period in supernodulating mutant was an distinct physiological feature in relation to seed yield production. This experiment was conducted to clanfy the functions of the supernodulating characters m seed yield determination by the comparison of agricultural traits of supernodulating soybean mutants with those of their parent cultivars.
제안 방법
Fertilizer, N : P2O5: K2O = 3:3:34 (kg/10a) was incorporated in the soil before planting as basal dressing. Experimental design was randomized complete block arrangement with three replications. During the growth period, ten soybean plants per plot were sampled at the growth stages of pod set (R3) and full seed (R6).
The lower part of cotyledonal node was regarded as under ground part. To examine the growth characteristics and dry weight, the plant sample was separated into leaf, petiole, stem, pod, root, and nodule, and the each part was dried at 75 ℃ for 48 hours. The dried samples were milled and carbon and nitrogen concentration of each part were measured by CNS analyzer.
대상 데이터
This work was supported by postdoctoral fellowships course from Nation Institute of Crop Science, RDA. The author is grateful to staffs of National Institute of Crop Science of Japan, for their supply of soybean seeds, Sakukei4, and Enrei. and a professor Suk Ha, Lee of Seoul National University for their supply of soybean seeds, SS2-2.
This experiment was carried out at the field of National Institute of Crop Science in Suwon province in 2004. Two supemodulating soybean mutants, Sakukei4 and SS2-2, and their parent cultivar, Enrei and Shinpaldalkong2, were tested. The chemical properties of soil in experimental plot showed the Table 1.
데이터처리
At the growth stage of full maturity (R8), soybean plants from 2 m row length x 2 rows of each plot were harvested for determining seed yield and yield components. The collected data were subjected to statistical analyses using SAS package for ANOVA and GLM.
성능/효과
In conclusion, we are assumed that the relative growth rate (RGR) from the early to the middle reproductive growth period was higher in supemodulating mutants than the wild types and this could be related to increasing pod number. The increase of RGR could be resulted from the successive supplement of nitrogen source from BNF of nodule by the middle reproductive growth period in supemodulating mutants.
The percentages of seed weight and pod number of supemodulating mutants compared with those of their parents were higher than those of plant dry weights. This indicated that although seed yield was lower caused by the decrease of plant dry weight in supemodulating mutants compared with their parent, the seed yield in supemodulating mutants was compensated indirectly by the increase of pod number and relative growth rate (Table 2) from the early to middle reproductive growth periods (Fig. 2). The relationship between stem dry weight and pod number at R8 stage in Fig.
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