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This study was carried out to investigate the effects of shading and pot size on the growth of Aquilegia buergeriana var. oxysepala after planting in the landscape. The seedlings were transplanted in Pot A (D155×H150mm) and Pot B (D90×H100mm), and then grown under 0, 30, 60, and 80% shading. The number and length of petioles, thickness of leaves, fresh and dry weight were measured. The number of petioles was significantly more under 30~60% shading. The length of petioles showed longest under 80% shading, but the petioles were actually overgrown and degenerated. As a result, the length of petioles also showed better under 30~60% shading. The thickness of leaves increased more under 30~60% shading compared to 80% shading. The fresh and dry weight increased in the order of 60, 30, 0, and 80% shading. The total growth was overall best under 30~60% shading. The plants grown in pot A showed better than those grown in the pot B. A. buergeriana var. oxysepala as a ground cover plant in the landscape could be planted under about 30~60% shading (sunlight intensity; 20~80Klux or 400~1,600µmol•m-2 •s-1) by an obstacle such as a group of needle-leaf trees, an isolated deciduous tree such as Zelkova serrata (H6.0×R60), Ailanthus altissima (H8.0×R50), Ginkgo biloba (H5.5×B25), and a site screened by three to six-story building. Pot A is better than pot B when potted plants of A. buergeriana var. oxysepala are required to simply make or remove flower beds (bedding and bedding out).
This study was carried out to investigate the effects of shading and pot size on the growth of Aquilegia buergeriana var. oxysepala after planting in the landscape. The seedlings were transplanted in Pot A (D155×H150mm) and Pot B (D90×H100mm), and then grown under 0, 30, 60, and 80% shading. The number and length of petioles, thickness of leaves, fresh and dry weight were measured. The number of petioles was significantly more under 30~60% shading. The length of petioles showed longest under 80% shading, but the petioles were actually overgrown and degenerated. As a result, the length of petioles also showed better under 30~60% shading. The thickness of leaves increased more under 30~60% shading compared to 80% shading. The fresh and dry weight increased in the order of 60, 30, 0, and 80% shading. The total growth was overall best under 30~60% shading. The plants grown in pot A showed better than those grown in the pot B. A. buergeriana var. oxysepala as a ground cover plant in the landscape could be planted under about 30~60% shading (sunlight intensity; 20~80Klux or 400~1,600µmol•m-2 •s-1) by an obstacle such as a group of needle-leaf trees, an isolated deciduous tree such as Zelkova serrata (H6.0×R60), Ailanthus altissima (H8.0×R50), Ginkgo biloba (H5.5×B25), and a site screened by three to six-story building. Pot A is better than pot B when potted plants of A. buergeriana var. oxysepala are required to simply make or remove flower beds (bedding and bedding out).
BACKGROUND : Environmental stress has a major effect on the growth and yields of vegetables, and can significantly affect nutritionally important phytochemicals, causing large economic losses. METHODS AND RESULTS :The present study was aimed at exploring the effects of water stress on the carotenoid and proline contents in kale leaves to understand drought tolerance of kale plants. Kale was randomly divided into two groups at 57 days after sowing (DAS). One of the groups was well-watered (WW) and the other was water stressed (WS). Harvesting of kale leaves was started one day after treatment (58 DAS) and continued for 10 days (~67 DAS). We investigated the status of plant growth (leaf number, length, width, fresh weight) of kale throughout the study. Carotenoid (lutein, α-carotene, zeaxanthin, β-carotene) and proline contents were analyzed by high-performance liquid chromatography (HPLC). Our results showed that the total carotenoid contents ranged from 926.0 to 1,212.0 mg/kg dry wt. (at 3 and 2 days, respectively) in WW treatment and 887.8 to 1,157.4 mg/kg dry wt. (at 10 and 4 days, respectively) in WS treatment. The ratio of individual carotenoid to the total carotenoid contents of kale leaves was 51.4 for lutein, 4.44 for zeaxanthin, 2.76 for α-carotene, and 41.4% for β-carotene. Total carotenoid contents showed a significant reduction from 7 days (1,037.2 mg/kg dry wt.) to 10 days (887.8 mg/kg dry wt.) in WS treatment. The lutein content did not show a significant difference in WW between 7 and 10 days after treatment but showed a significant difference in WS treatment. The α-carotene content showed no significant difference between the treatments. However, zeaxanthin content was higher during 4 10 days and -β-carotene content was lower during 6 10 -days in WS than in WW on each harvest day. In WW, the proline content showed no significant difference, but in WS, the proline content started to increase at 7 days and almost doubled in 10 days. CONCLUSION : The marked increase in zeaxanthin and proline contents in kale leaves indicated that the two phytochemicals are associated with drought tolerance in the plant.
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