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Position of Source Leaf Affects Translocation and Distribution of C¹⁴ Photo-Assimilates in Tomato
Sang Gyu Lee,Chiwon W. Lee (사)한국생물환경조절학회 2006 시설원예‧식물공장 Vol.15 No.2
The relationship between source leaf position and photo-assimilate translocation and distribution was characterized for tomato (Lycopersicon esculentum Mill) grown in the greenhouse. Three different positions of source leaf on the stem (first node above or below the first fruit cluster and 5<SUP>th</SUP> node above the first fruit cluster) were tested for their influence on <SUP>14</SUP>CO₂ assimilation and transfer to different parts of the plant. The leaves at the 5<SUP>th</SUP> node above the first fruit cluster transferred the highest (57%) proportion of C<SUP>14</SUP> to other plant parts, followed by leaves borne on the first node below the first fruit cluster (50%), and the first node above the first fruit cluster (39%). In all treatments, fruits served as the strongest sink for C<SUP>14</SUP>, followed by stem, leaf, and root tissues. The leaf borne on the 5<SUP>th</SUP> node above the first fruit cluster transferred the largest amount of C<SUP>14</SUP> to the second fruit cluster.
Dong Hoon Lee,Myong Sun Park,Chiwon W. Lee,Jong Myung Choi 한국원예학회 2017 원예과학기술지 Vol.35 No.4
This study investigated the effect of pre-planting nitrogen (N) fertilization levels added to a soilless root medium on the growth of ̒Dotaerang Dia̓ tomato seedlings. The N levels were varied for a total of 7 treatments: 0, 100, 250, 500, 750, 1,000, or 1,500 mg·L<SUP>-1</SUP>. The pH of the root media gradually rose in all treatments as the seedlings grew; however, the differences in the pH were not significant among the treatments. The electrical conductivity (EC) of the root media was significantly different among the treatments from sowing to week three, then drastically decreased after week four, which diminished the differences in the EC among the treatments. At week six, plant height, leaf length, leaf width, number of leaves, and fresh and dry weights of the shoot were highest for the treatment with 500 mg·L<SUP>-1</SUP> N. In contrast, the treatment with 1,500 mg·L<SUP>-1</SUP> N had the lowest results for all growth measurements. The fresh weight was 67% heavier in the 500 mg·L<SUP>-1</SUP> N treatment compared to the 1,500 mg·L<SUP>-1</SUP> N treatment. The total N content in the tissues was lowest in the treatment with 0 mg·L<SUP>-1</SUP> N and highest in the treatment with 1,000 mg·L<SUP>-1</SUP> N. The contents of calcium (Ca), magnesium (Mg), and metal micronutrients in the tissues were highest in the 250 mg·L<SUP>-1</SUP> N treatment. A previous study demonstrated that adjusting the fertilization level to promote growth to over 90% of the maximum growth is a good strategy for lowering production costs and preventing damage due to excessive fertilizer absorption by crops. Our results indicated that the optimal pre-planting N fertilization level for tomato plug seedlings should be lower than 500 mg·L<SUP>-1</SUP> and the optimum tissue N contents should be around 3.21% to 4.60%.
Sang-Gyu Lee,Kwan-Dal Ko,Chiwon W. Lee 한국원예학회 2005 Horticulture, Environment, and Biotechnology Vol.46 No.5
The patterns of C¹⁴ carbohydrate translocation and distribution from the source leaf to various plant parts in watermelon grown in the greenhouse and field were investigated. Seedling-grown plants were pruned to two branches with one carrying a fruit. When leaves at four different positions (on fruit-bearing node, on the 5th node above and below the fruit-bearing node, and on the 5th node from the base of the non-fruit-bearing stem) were exposed to ¹⁴CO₂, the distribution of C¹⁴ compounds to different parts (fruit, stem, leaf, and root) of the plant varied. In all treatments, the fruit was the strongest sink, followed by the stem, leaf, and root. The highest percentage of C¹⁴ photoassimilates was translocated out of the source when the leaf born on the fruit-bearing node was exposed to ¹⁴CO₂ in both greenhouse- and field-grown plants. Translocation of C¹⁴ compounds from the leaves on the 5th node or above and below the first fruit-carrying node was similar. Only 29% of C¹⁴ was translocated from the source leaf born on the 5th node of the non-fruit bearing branch in the greenhouse, as compared to more than 46% of the C¹⁴ from other source leaves. Accumulation of C¹⁴ in the root tissues was greatest when source leaves were born on the non-fruit bearing branch. In general, field-grown plants had a larger proportion of the C¹⁴ translocated as compared to greenhouse-grown plants.